"AND * * WOOD AND FOREST By WILLIAM NO YES Assistant Professor of Industrial Arts, Teachers College, Columbia University NEW YORK CITY THE MANUAL ARTS PRESS PEORIA, ILLINOIS 4 "> COPYRIGHT WILLIAM NOYES 1912 SECOND EDITION, DECEMBER. 1912. FOREWORD This book has been prepared as a companion volume to the au- thor's Handivork in Wood* It is an attempt to collect and arrange in available form useful information, now widely scattered, about our common woods, their sources, growth, properties and uses. As in the other volume, the credit for the successful completion of the book is to be given to my wife, Anna Gausmann Noyes, who has made the drawings and maps, corrected the text, read the proof, and carried the work thru to its final completion. Acknowledgments are hereby thankfully made for corrections and suggestions in the text to the following persons : Mr. A. D. Hopkins, of the United States Department of Agri- culture, Bureau of Entomology, for revision of the text relating to Insect Enemies of the Forest, in Chapter VI. Mr. George G. Hedgcock, of the United States Bureau of Agri- culture, Bureau of Plant Industry, for revision of the text relating to the fungal enemies of the forest, in Chapter VI. Mr. S, T. Dana and Mr. Burnett Barrows, of the United States Department of Agriculture, Forest Service, for revision of Chapters IV, V, VI, VII, and VIII. Professor Charles R. Richards, formerly Head of the Manual Training Department of Teachers College, my predecessor as lec- turer of the course out of which this book has grown. Professor M. A. Bigelow, Head of the Department of Botany of Teachers College, for revision of Chapter I, on the Structure of Wood. Mr. Romeyn B. Hough, of Lowville, N". Y., author of American Woods and Handbook of the Trees of the Northern States and Can- ada, for suggestions in preparing the maps in Chapter III. The Forest Service, Washington, D. C., for photographs and maps credited to it, and for permission to reprint the key to the identification of woods which appears in Forest Service Bulletin No. 10, Timber, by Filibert Roth. The Division of Publications, U. S. Department of Agriculture, for permission to copy illustrations in bulletins. 1 William Noyes, Handwork in Wood, Peoria, 111. The Manual Arts Press, 231 pp., $2. 1 The Macmillan Company, New York, for permission to reproduce Fig. 86, Portion of the Mycelium of Dry Eot, from Timber and Some of its Diseases, by H. M. Ward. Mrs. Katharine Golden Bitting, of Lafayette, Indiana, for the photograph of the cross-section of a bud, Figure 5. Finally and not least I hereby acknowledge my obligations to the various writers and publishers whose books and articles I have freely used. As far as possible, appropriate credit is given in the paged references at the end of each chapter. CONTEXTS. CHAPTER General Bibliography 4 I The Structure of Wood 9 II Properties of Wood 41 III The Principal Species of American Woods 57 IV The Distribution and Composition of the North American Forests 197 V The Forest Organism 211 VI Natural Enemies of the Forest 229 VII The Exhaustion of the Forest 251 VIII The Use of the Forest 271 Appendix 289 Index . . .304 GENERAL BIBLIOGRAPHY Apgar, A. G., Trees of the Northern United States. N. Y.: American Book Co., 224 pp. A small book dealing with the botany of trees, giving de- scriptions of their essential organs, and particularly valuable for the leaf key to the trees. It should be supplemented by Keeler or Hough's Handbook. Baterden, J. R., Timber. N. Y.: D. Van Nostrand Co., 1908, 351 pp. A description of the timbers of various countries, discussion of timber defects, timber tests, etc. Bitting, K. G., The Structure of Wood. Wood Craft, 5: 76, 106, 144, 172, June-Sept., '06. A very scholarly and valuable series of articles on wood structure and growth. Excellent microphotographs. Britton, Nathaniel Lord, North American Trees. N. Y. : Henry Holt & Co., 1908, 894 pp. A description of all the kinds of trees growing inde- pendently of cultivation in North America, north of Mexico, and the West Indies. The standard Botany of trees. Boulger, G. S., Wood. London: Edward Arnold, 369 pp. A thoro discus- sion of wood structure, with chapters on the recognition and classifica- tion of woods, defects, preservation, uses, tests, supplies, and sources of wood. Good illustrations. Bruce, E. S., Frost Checks and Wind Shakes. Forestry and Irrigation, 8: 159, April, '02. An original study of the splitting of trees by sudden frost and thaw. Bruncken, Ernest, North American Forests and Forestry. N. Y. : G. P. Putnam's Sons. 265 pp. A comprehensive survey of American Forestry conditions including the forest industries, fires, taxation, and manage- ment. No illustrations. Busbridge, Harold, The Shrinkage and Warping of Timber. Sci. Amer. Suppl., No. 1500, Oct. 1, 1904. Good photographic illustrations. Comstock, J. H. and A. B., A Manual for the Study of Insects. Ithaca, N. Y. : Comstock Publishing Co., 701 pp. Valuable for reference in classifying insects injurious to wood. Curtis, Carleton C., Nature and Development of Plants. N. Y. : Henry Holt & Co., 1907, 471 pp. Chapter III is a very clear and excellent discus- sion of the structure of the stem of plants (including wood). Encyclopedia Brittannica, Eleventh Edition, Cambridge: At the University Press. Article: Forests and Forestry, Vol. 10, p. 645. Article: Plants, Anatomy of, Vol. 21, p. 741 Article: Timber Vol. 26, p 978. Felt, E. P., The Gypsy and Brown Tail Moths. N. Y. State Museum: Bul- letin 103, Entomology, 25. Valuable for colored illustrations as well as for detailed descriptions. Fernow, B. E., Economics of Forestry. N. Y.: T. Y. Crowell & Co. 1902, quarto 520 pp. A treatment of forests and forestry from the standpoint 4 GENERAL BIBLIOGRAPHY. of economics, including a comprehensive exposition of the forester's art, with chapters on forest conditions, silviculture, forest policies, and methods of business conduct, with a bibliography. Fernow, B. E., Report upon the Forestry Investigation of the U. S. Depart- ment of Agriculture, 1887-1898. Fifty-fifth Congress, House of Repre- sentatives, Document No. 181. Quarto, 401 pp. A review of forests and forestry in the U. S., of forest policies of European nations, par- ticularly of Germany, of the principles of silviculture, of a discussion of forest influences, and a section on timber physics. Harwood, W. S., The New Earth. N. Y.: The Macmillan Co., 1906. 378 pp. A recital of the triumphs of modern agriculture. Chap. X on modern forestry, describes what has been done in different states in conservative lumbering. Hough, Romeyn B.. American Woods. Lowville, N. Y. : The author. An invaluable collection in eleven volumes (boxes) of sections of 275 spe- cies of American woods. There are three sections of each species, cross, radial, and tangential, mounted in cardboard panels. Accompanied by a list of descriptions and analytical keys. Hough, Romeyn B., Handbook of the Trees of the Northern States and Can- ada. Lowville, N. Y. : The author. 470 pp. A unique, elegant, and sumptuously illustrated book, with photographs of tree, trunk, leaf, fruit, bud, and sometimes wood, a map of the habitat of each species, and a full and careful description of tree and wood. Intended for bot- anists, foresters and lumbermen. Johnson, J. B., The Materials of Construction. N. Y. : John Wiley & Sons. 1898. 775 pp. Chapter XIII is identical with Forestry Bulletin X, Roth's Timber. Keeler, Harriet, Our Native Trees. N. Y. : Scribner's. 1900. 533 pp. A very attractive and popular book showing great familiarity with the common trees and love of them. Numerous photographs and drawings. Lounsberry, Alice, A Guide to the Trees. N. Y. : Frederick A. Stokes Co. 313 pp. A popular description of some 200 common trees, with plenti- ful illustrations. Pinchot, Gifford, A Primer of Forestry. Parts I and II, U. S. Dept. of Agric. For. Serv. Bull. No. 24. 88 pp. and 88 pp. A concise, clear, and fully illustrated little manual of forestry conditions, forest enemies, forestry principles and practice abroad and in the U. S. Pinchot, Gifford. The Adirondack Spruce. N. Y.: G. P. Putnam's Sons. A technical account of the author's investigations on a forest estate in Northern New York. Price, 0. W., Saving the Southern Forests. World's Work, 5: 3207, March, '03. A plea for conservative lumbering; excellent illustrations. Record, Samuel J., Characterisation of the Grain and Texture of Wood. Woodcraft, 15: 3, June, 1911. Roth, Filibert, A First Book of Forestry. Boston: Ginn & Co. 291 pp. A book for young people, giving in an interesting form many valuable 6 WOOD AND FOREST. facts about American forests and their care and use. It includes a leaf key to the trees. Sargent, Charles Sprague, Forest Trees of North America. U. S. 10th Census, Vol. 9. Quarto, 612 pp. Part 1 deals with the distribution of the forests, and gives a catalog and description of the forest trees of North America, exclusive of Mexico. Part II. Tables of properties of the woods of the U. S. Part III. The economic aspects of the for- ests of the U. S. considered geographically, and maps showing distri- butions and densities. Exceedingly valuable. Sargent, Charles Sprague, Jesup Collection, The Woods of the U. S. N. Y. : D. Appleton & Co., 203 pp. A detailed description of the Jesup Col- lection of North American Woods in the American Museum of Natural History, N. Y. City, with valuable tables as to strength, elasticity, hardness, weight, etc. Condensed from Vol. IX of 10th U. S. Census. Sargent, Charles Sprague, Manual of the Trees of North America. Boston: Houghton, Mifflin & Co. 826 pp. A compact mine of information, with some errors, about the known trees of North America and their woods, summarized from Sargent's larger work, "The Silva of North America." (See below.) Sargent, Charles Sprague, The Silva of North America. Boston: Houghton, Mifflin Co. A monumental and sumptuous work of 14 quarto volumes, describing in great detail all the known trees of North America and their woods, with beautiful line drawings of leaves and fruits. Shaler, Nathaniel S., The United States of America. Vol. 1, pp. 485-517. N. Y. : D. Appleton & Co. Chapter IX is a popular description of American forests and the Lumber Industry. Snow, Chas. Henry, The Principal Species of Wood. N. Y.: John Wiley & Sons. 203 pp. Descriptions and data regarding the economically im- portant varieties of wood, with excellent photographs of trees and woods. Strasburger, Noll, Schenck, and Schimper. A Text Book of Botany. N. Y.: Macmillan & Co. 746 pp. Valuable for minute information about the morphology of wood. U. S. Tenth Census, Vol. IX. See Sargent. U. S. Department of Agriculture, Forest Service Bulletins. The character of these government pamphlets is well indicated by their titles. No. 10 is an exceedingly valuable summary of the facts about the structure and properties of wood, contains the best available key to identification of common American woods (not trees) and a concise description of each. It is incorporated, as Chap. XIII, in Johnson's, t( The Materials for Construction." N. Y.: John Wiley & Sons. Nos. 13 and 22 are large monographs containing much valuable information. No. 10. Filibert Roth, Timber. No. 13. Charles Mohr, The Timber Pines of the Southern United States. No. 15. Frederick V. Coville, Forest Growth and Sheep Grazing in the Cascade Mountains of Oregon. No. 16. Filibert Roth, Forestry Conditions in Wisconsin. GENERAL BIBLIOGRAPHY. 7 No. 17. George B. Sudworth, Check List of the Forest Trees of the United States, 1898. No. 18. Charles A. Keffer, Experimental Tree Planting on the Plains. No. 22. V. M. Spalding and F. H. Chittenden, The White Pine. No. 24. Gifford Pinchot, A Pricier of Forestry. No. 26. Henry S. Graves, Practical Forestry in the Adirondacks. No. 41. Herman von Schrenck, Seasoning of Timber. No. 45. Harold B. Kempton, The Planting of White Pine in New Eng- land. No. 52. Royal S. Kellogg, Forest Planting in Western Kansas. No. 61. Terms Used in Forestry and Logging. No. 65. George L. Clothier, Advice for Forest Planters in Oklahoma and Adjacent Regions. No. 74. R. S. Kellogg and H. M. Hale, Forest Products of the U. 8., 1905. U. S. Department of Agriculture, Forest Service Circulars. No. 3. George William Hill, Publications for Sale. No. 25. Gifford Pinchot, The Lumberman and the Forester. No. 26. H. M. Suter, Forest Fires in the Adirondacks in 1903. No. 36. The Forest Service: What it is, and how it deals with Forest Problems. Also Classified List of Publications and Guide to Their Contents. No. 37. Forest Planting in the Sand Hill Region of Nebraska. No. 40 H. B. Holroyd, The Utilization of Tupelo. No. 41. S. N. Spring, Forest Planting on Coal Lands in Western Pennsylvania. No. 45. Frank G. Miller, Forest Planting in Eastern Nebraska. No. 81. R. S. Kellogg, Forest Planting in Illinois. No. 97 R. S. Kellogg, Timber Supply of the United States. No. 153, A. H. Pierson, Exports and Imports of Forest Products, 1907. U. S. Department of Agriculture Year Books for: 1896. Filibert Roth, The Uses of Wood. 1898, p. 181. Gifford Pinchot, Notes on some Forest Problems. 1899, p. 415. Henry S. Graves, The Practice of Forestry by Private Owners. 1900, p 199. Hermann von Schrenck, Fungous Diseases of Forest Trees. 1902, p. 145. William L. Hall, Forest Extension in the Middle West. 1902, p. 265. A. D. Hopkins, Some of the Principal Insect Enemies of Coniferous Forests in the United States. 1902, p. 309. Overton, W. Price, Influence of Forestry on the Lumber Supply. 1903, p. 279. James W. Tourney, The Relation of Forests to Stream Flow. 1903, p. 313. A. D. Hopkins, Insect Injuries to Hardwood Forest Trees. 1904, p, 133. E. A. Sterling, The Attitude of Lumbermen toward Forest Fires. 8 WOOD AND FOREST. 1904, p. 381. A. D. Hopkins, Insect Injuries to Forest Products. 1905, p. 455. Henry Grinell, Prolonging the Life of Telephone Poles. 1905, p. 483. J. Grivin Peters, Waste in Logging Southern Yellow Pine. 1905, p. 636. Quincy R. Craft, Progress of Forestry in 1905. 1907, p 277. Raphael Zon and E. H. Clapp, Cutting Timber in the National Forests. U. S. Department of Agriculture, Division of Entomology Bulletins: No. 11. n. s. L. O. Howard, The Gypsy Moth in America. No. 28. A. D. Hopkins, Insect Enemies of the Spruce in the Northeast. No. 32. n. s. A. D. Hopkins, Insect Enemies of the Pine in the Black Hills Forest Reserve. No. 48. A. D. Hopkins, Catalog of Exhibits of Insect Enemies of Forest and Forest Products at the Louisiana Purchase Exposition, St. Louis, Mo., 1904. No. 56. A. D. Hopkins, The Black Hills Beetle No. 58. Part 1, A. D. Hopkins, The Locust Borer. No. 58. Part II, J. L. Webb, The Western Pine Destroying Bark Beetle. U. S. Department of Agriculture, Bureau of Plant Industry, Bulletins: No. 32. Herman von Schrenck, A Disease of the White Ash Caused by Polyporus Fraxinophilus, 1903. No. 36. Hermann von Schrenck, The "Bluing" and "Red Rot" of the Western Yellow Pine, 1903. Report of the Commissioner of Corporations on the Lumber Industry, Part I, Standing Timber, February, 1911. The latest and most reliable inves- tigation into the amount and ownership of the forests of the United States. Ward, H. Marshall, Timber and some of its Diseases. London: Macmillan & Co., 295 pp. An English book that needs supplementing by informa- tion on American wood diseases, such as is included in the list of gov- ernment publications given herewith. The book includes a description of the character, structure, properties, varieties, and classification of timbers CHAPTER I. THE STRUCTURE OF WOOD. When it is remembered that the suitability of wood for a par- ticular purpose depends most of all upon its internal structure, it is plain that the woodworker should know the essential characteris- tics of that structure. While his main interest in wood is as lum- ber, dead material to be used in woodworking, he can properly un- derstand its structure only by knowing something of it as a live, growing organism. To facilitate this, a knowledge of its position in the plant world is helpful. All the useful woods are to be found in the highest sub-kingdom of the plant world, the flowering plants or Phanerogamia of the botanist. These flowering plants are to be classified as follows: r I. Gymnosperms. (Naked seeds.) 1. Cycadaceae. (Palms, ferns, etc.) 2. Gnetaceae. (Joint firs.) 3. Conifers. Pines, firs, etc. Phanerogamia, n Angiosperms . (rruits .) (Flowering plants ^ Monocotyledons. (One seed-leaf.) Palms, bamboos, grasses, etc.) 2. Dicotyledons. (Two seed-leaves.) a. Herbs. b. Broad-leaved trees. Under the division of naked-seeded plants (gymnosperms), prac- tically the only valuable timber-bearing plants are the needle-leaved trees or the conifers, including such trees as the pines, cedars, spruces, firs, etc. Their wood grows rapidly in concentric annual rings, like that of the broad-leaved trees ; is easily worked, and is more widely used than the wood of any other class of trees. Of fruit-bearing trees (angiosperms), there are two classes, those that have one seed-leaf as they germinate, and those that have two seed-leaves. The one seed-leaf plants (monocotyledons) include the grasses, lilies, bananas, palms, etc. Of these there are only a few that reach 10 WOOD AND FOREST. the dimensions of trees. They are strikingly distinguished by the structure of their stems. They have no cambium layer and no dis- tinct bark and pith; they have unbranched stems, which as a rule do not increase in diameter after the first stages of growth, but grow only terminally. Instead of having concentric annual rings and thus growing larger year by year, the woody tissue grows here and there thru the stem, but mostly crowded together toward the outer surfaces. Even where there is radial growth, as in yucca, the struc- ture is not in annual rings, but irregular. These one seed-leaf tree? (monocotyledons) are not of much economic value as lumber, being used chiefly "in the round," and to some extent for veneers and inlays; e. g. f cocoanut-palm and porcupine wood are so used. The most useful of the monocotyledons, or endogens, ("inside growers," as they are sometimes called,) are the bamboos, which are giant members of the group of grasses, Fig. 1. They grow in dense forests, some varieties often 70 feet high and 6 inches in diameter, shooting up their entire height in a single season. Bamboo is very highly valued in the Orient, where it is used for masts, for house rafters, and other building purposes, for gutters and water-pipes and in countless other ways. It is twice as strong as any of our woods. Under the fruit-bearing trees (angiosperms), timber trees arc chiefly found among those that have two seed-leaves (the dicotyle- dons) and include the great mass of broad-leaved or deciduous trees, such as chestnut, oak, ,ash and maple. It is to these and to the coni- fers that our principal attention will be given, since they constitute the bulk of the wood in common use. The timber-bearing trees, then, are the : (1) Conifers, the needle-leaved, naked-seeded trees, such as pine, cedar, etc. Fig. 45, p. 199. (2) Endogens, which have one seed-leaf, such as bamboos, Fig. 1^ (3) Broad-leaved trees, having two seed-leaves, such as oak, beech, and elm. Fig. 48, p. 202. The common classifications of trees are quite inaccurate. Many of the so-called deciduous (Latin, deciduus, falling off) trees are evergreen, such as holly, and, in the south, live oak, magnolia and cherry. So, too, some of the alleged "evergreens," like bald cypress and tamarack, shed their leaves annually. THE STRUCTURE OF WOOD. 11 Fig. 1. A Bamboo Grove, Kioto, Japan. 12 WOOD AND FOREST. Not all of the "conifers" bear cones. For example, the juniper bears a berry. The ginko, Fig. 2, tho classed among the "conifers," the "evergreens," and the "needle-leaf" trees, bears no cones, has broad leaves and is deciduous. It has an especial interest as being the sole survivor of many species which grew abundantly in the carboniferous age. Also, the terms used by lumbermen, "hard woods" for broad-leaved trees and "soft woods" for conifers, are still less exact, for the wood of some broad-leaved trees, as bass and poplar, is much softer than that of some conifers, as Georgia pine and lignum vitae. Another classification commonly made is that of "endogens" (inside growers) including bamboos, palms, etc., and exogens (outside growers) which would include both conifers and broad-leaved trees. One reason why so many classifications have come into use is that none of them is quite accurate. A better one will be explained later. See p. 23. As in the study of all woods three sections are made, it is well at the outset to understand clearly what these are. The sections of a tree made for its study are (Fig. 3) : (1) Transverse, a plane at right angles to the organic axis. (2} Radial, a longitudinal plane, including the organic axis. Fig. 2. Ginko Leaf. A A.. Fig. 3. I?. A, B, C, D, Transverse Section. B, D, E, F, Radial Section. G, H, I, J, Tangential Section. A, B, C, Transverse Section. A, B, D, E, Radial Section. B, C, E, F, Tangential Section. THE STRUCTURE OF WOOD. 13 PITH (3) Tangential, a longitudinal plane not including the organic axis. If a transverse section of the trunk of a conifer or of a broad- leaved tree is made, it is to be noted that it consists of several distinct parts. See Fig. 4. These, beginning at the outside, are : (1) Rind or bark (a) Cortex (b) Bast (2) Cambium (3) Wood (a) Sap-wood (b) Heart- wood < 4) pith - (1) The rind or lark is made up of two layers, the outer of which, the "cortex," is corky and usually scales or pulls off easily; while the in- ner one is a fibrous coat called "bast" or "phloem." To- gether they form a cone, wid- est, thickest, and roughest at the base and becoming nar- rower toward the top of the tree. The cortex or outer bark serves to protect the stem of the tree from extremes of heat and cold, from atmospheric changes, and from the browsing of animals. It is made up of a tough water-proof layer of cork which has taken the place of the tender skin or "epidermis" of the twig. Because it is water-proof the outside tissue is cut off from the water supply of the tree, and so dries up and peels off, a mass of dead matter. The cork and the dead stuff together are called the bark. As we shall see later, the cork grows from the inside, being formed in the inner layers of the cortex, the outer layers of dry bark being thus successively cut off. The characteristics of the tree bark are due to the positions and kinds of tissue of these new layers of cork. Each tree has its own kind of bark, and the bark of some is so characteristic as to make the tree easily recognizable. LErtTlCEL Fig. 4. Diagram of Cross-section of Three Year Old Stem of Bassvvood. 14 WOOD AND FOREST. Bark may be classified according to formation and method of separation, as scale bark, which detaches from the tree in plates, as in the willows ; membraneous bark, which comes off in ribbons and films, as in the birches; fibrous bark, which is in the form of stiff threads, as in the grape vine; and fissured bark, which breaks up in longitudinal fissures, showing ridges, grooves and broad, angular patches, as in oak, chestnut and locust. The last is the commonest form of bark. The bark of certain kinds of trees, as cherry and birch, has pe- culiar markings which consist of oblong raised spots or marks, es- pecially on the young branches. These are called lenticels (Latin len- ticula, freckle), and have two purposes: they admit air to the internal tissues, as it were for breathing, and they also emit water vapor. These lenticels are to be found on all trees, even where the bark is very thick, as old oaks and chestnuts, but in these the lenticels are in the bottoms of the deep cracks. There is a great difference in the inflammability of bark, some, like that of the big trees of California, Fig. 54, p. 209, which is often two feet thick, being practically in- combustible, and hence serving to protect the tree; while some bark, as canoe birch, is laden with an oil which burns furiously. It there- fore make? admirable kindling for camp fires, even in wet weather. Inside the cork is the "phloem" or "bast," which, by the way, gives its name to the bass tree, the inner bark of which is very tough and fibrous and therefore used for mat and rope making. In a liv- ing tree, the bast fibers serve to conduct the nourishment which has been made in the leaves down thru the stem to the growing parts. (2) The cambium. Inside of the rind and between it and the wood, there is, on living trees, a slimy coat called cambium (Med. Latin, exchange). This is the living, growing part of the stem, familiar to all who have peeled it as the sticky, slimy coat between the bark and the wood of a twig. This is what constitutes the fra- grant, mucilaginous inner part of the bark of slippery elm. Cambium is a tissue of young and growing cells, in which the new cells are formed, the inner ones forming the wood and the outer ones the bark. In order to understand the cambium and its function, consider its appearance in a bud, Fig. 5. A cross-section of the bud of a growing stem examined under the microscope, looks like a delicate mesh of thin membrane, filled in with a viscid semi-fluid substance which is called "protoplasm" (Greek, protos, first; plasma, form). These meshes THE STRUCTURE OF WOOD. 15 were first called "cells" by Eobert Hooke, in 1667, because of their resemblance to the chambers of a honeycomb. The walls of these "cells" are their most prominent feature and, when first studied, were supposed to be the essential part; but later the slimy, colorless substance which filled the cells was found to be the essential part. This slimy substance, called protoplasm, con- stitutes the primal stuff of all living things. The cell walls themselves are formed from it. These young cells, at the apex of a stem, are all alike, very small, filled with protoplasm, and as yet, unaltered. They form embryonic tissue, i. e. one which will change. One change to which any cell filled with proto- plasm is liable is divi- sion into two, a new par- tition wall forming with- in it. This is the way plant cells increase. In young plant cells, the whole cavity of the chamber is filled with protoplasm, but as the cells grow older and larger, the protoplasm develops into different parts, one part forming the cell wall and in many cases leaving cavi- ties within the cell, which become filled with sap. The substance of the cell wall is called cellulose (cotton and flax fibers consist of al- most pure cellulose). At first it has no definite structure, but as growth goes on, it may become thickened in layers, or gummy, or Fig. 5. Young Stem, Magnified 18^ Diameters, Show- ing Primary and Secondary Bundles. By Courtesy of Mrs. Katharine Golden Bitting. E, epidermis, tbe single outside laver of cells. C, cortex, the region outside of the bundles. HB, hard bast, the black, irregular ring protecting the soft bast. SB, soft bast, the light, crescent-shaped parts. Ca, cambium, the line between the soft bast and the wood. W, wood, segments showing pores. MR, medullarj- rays, lines between the bundles con- necting the pith and the cortex. MS, medullary sheath, the dark, irregular ring just inside the bundles. P, pith, the central mass of cells. 16 WOOD AND FOREST. hardened into lignin (wood), according to the function to be per- formed. Where there are a group of similar cells performing the same functions, the group is called a tissue or, if large enough, a tissue system. When cells are changed into new forms, or "differentiated," as it is called, they become permanent tissues. These permanent tissues of the tree trunk constitute the various parts which we have noticed, viz., the rind, the pith and the wood. The essentially living part of the tree, it should be remembered, is the protoplasm : where there is protoplasm, there is life and Fig-. 6. Three Stag-es in the Development of an Exogenous Stem. P, pith; PB, primary bast; SB, secondary bast; C, cambium; PR, pith ray; PW, primary wood; SW, secondary wood; PS, procambium strands. After Boulger. growth. In the stems of the conifers and broad-leaved trees some- times together called exogens this protoplasm is to be found in the buds and in the cambium sheath, and these are the growing parts of the tree. If we followed up the sheath of cambium which envelopes a stem, into a terminal bud, we should find that it passed without break into the protoplasm of the bud. In the cross-section of a young shoot, we might see around the. central pith or medulla, a ring of wedge-shaped patches. These afe really bundles of cells running longitudinally from the rudiments of leaves thru the stem to the roots. They are made of protoplasm >4ind are called the "procambium strands," Fig. 6. THE STRUCTURE OF WOOD. In the monocotyledons (endogens) these procambium strands change completely into wood and bast, and so losing all their proto- plasmic cambium, become incapable of further growth. This is why palms can grow only lengthwise, or else by forming new fibers more densely in the central mass. But in the conifers and broad-leaved trees, the inner part of each strand becomes wood and the outer part bast (bark). Between these bundles, connecting the pith in the cen- ter with the cortex on the outside of the ring of bundles, are parts of the original pith tissue of the stem. They are the primary pith or medullary rays (Latin, medulla, pith). The number of medullary rays depends upon the number of the bundles; and their form, on the width of the bundles, so that they are often large and conspicu- ous, as in oak, or small and indeed invisible, as in some of the coni- fers. But they are present in all exogenous woods, and can readily be seen with the microscope. Stretching across these pith rays from the cambium layer in one procambium strand to that in the others, the cambium formation extends, making a complete cylindrical sheath from the bud downward over the whole stem. This is the cambium sheath and is the living, growing part of the stem from which is formed the wood on the inside and the rind (bark) on the outside. In the first year the wood and the bast are formed di- rectly by the growth and change of the inner and outer cells respectively of the pro- cambium strand, and all such material is called "primary;" but in subsequent years all wood, pith rays, and bast, originate in the cambium,, and these growths are called "sec- ondary." (3) The wood of most exogens is made up of two parts, a lighter part called the sap-wood or splint-wood or alburnum, and a darker part called the heart-wood or duramen, Fig. 7. Sap-wood is really immature heart- wood. The difference in color between them is very marked in some woods, as in lignum vitae and black walnut, and very slight in others. Fig-. 7. Sap-wood and Heart-wood, Lignum Vitac. 18 WOOD AND FOREST. as spruce and bass. Indeed, some species never form a distinct heart- wood, birch (Betula alba) being an example. In a living tree, sap-wood and heart-wood perform primarily quite different functions. The sap-wood carries the water from the roots to the leaves, stores away starch at least in winter, and in other ways assists the life of the tree. The proportional amount of sap- wood varies greatly, often, as in long-leaf pine, constituting 40 per cent, of the stem. As the sap-wood grows older, its cells become choked so that the sap can no longer flow thru them. It loses its protoplasm and starch and becomes heart- wood, in which all cells are dead and serve only the me- chanical function of holding up the great weight of the tree and in resisting wind pres- sures. This is the rea- son why a tree may become decayed and hollow and yet be alive and bear fruit. In a tree that is actually dead the sap-wood rots first. Chemical s u b - stances infiltrate into the cell walls of heart- wood and hence it has a darker color than the sap-wood. Persimmon turns black, walnut purplish brown, sumac yellow, oak light brown, tulip and poplar yellowish, redwood and cedar brownish red. Many woods, as mahogany and oak, darken under exposure, which shows that the substances producing the color are oxidizable and unstable. Wood dyes are obtained by boiling and distilling such woods as su- mach, logwood, red sanders, and fustic. Many woods also acquire distinct odors, as camphor, sandalwood, cedar, cypress, pine and mahogany, indicating the -presence of oil. Fig-. 8. Section of Doug-las Fir, Showing- Annual Ring-s and Knots at Center of Trunk. American Museum of Natural History, N. T. THE STRUCTURE OF WOOD. 19 As a rule heart-wood is more valuable for timber, being harder, heavier, and drier than sap-wood. In woods like hickory and ash, however, which are used for purposes that require pliability, as in baskets, or elasticity as in handles of rakes and hoes, sap-wood is more valuable than heart-wood. In a transverse section of a conifer, for example Douglas spruce, Fig. 8, the wood is seen to lie in concentric rings, the outer part of the ring being darker in color than the inner part. In reality each of these rings is a section of an irregular hollow cone, each cone en- veloping its inner neighbor. Each cone ordinarily constitutes a year's growth, and therefore there is a greater number of them at the base of a tree than higher up. These cones vary greatly in Uiickncss, or, looking at a cross-section, the rings vary in width; in general, those at the center being thicker than those toward the bark. Va- riations from year to year may also be noticed, showing that the tree was well nourished one year and poorly nourished another year. Rings, however, do not always indicate a year's growth. "False rings" are sometimes formed by a cessa- tion in the growth due to drouth, fire or other accident, followed by renewed growth the same season. In a radial section of a log, Fig. 8, these "rings"' appear as a series of parallel lines and if one could examine a long enough log these lines would converge, as would the cut edges in a nest of cones, if they were cut up thru the center, as in Fig. 9. In a tangential section, the lines appear as broad bands, and since almost no tree grows perfectly straight, these lines are wavy, and give the charactistic pleasing "grain" of wood. Fig. 27, p. 35. The annual rings can sometimes be discerned in the bark as well as in the wood, as in corks, which are made of the outer bark of the cork oak, a product of southern Europe and northern Africa. Fig. 10. The growth of the wood of exogenous trees takes place thru the ability, already noted, of protoplasmic cells to divide. The cambium cells, which have very thin walls, are rectangular in shape, broader tangentially than radially, and tapering above and below to a chisel Fig. 9. Diagram of Radial Section of Log- (exaggerated) Showing Annual Cones of Growth. 20 WOOD AND FOREST. Fig. 10. Annual King-s in Bark (cork). edge, Fig. 11. After they have grown somewhat radially, partition walls form across them in the longitudinal, tangential direction, so that in place of one initial cell, there are two daughter cells radially disposed. Each of these small cells grows and re-divides, as in Fig. 12. Finally the inner- most cell ceases to divide, and uses its protoplasm to become jfl X A thick and hard wood. In like manner the outermost cambium cell becomes bast, while the cells between them continue to grow and divide, and so the process goes on. In nearly all stems, there is much more abundant formation of wood than of bast cells. In other words, more cambium cells turn to wood than to bast. In the spring when there is comparatively little light and heat, when the roots and leaves are inactive and feeble, and when the bark, split by winter, does not bind very tightly, the inner cam- bium cells produce ra- dially wide wood cells with relatively thin walls. These constitute the spring wood. But in summer the jacket of bark binds tightly, there is plenty of heat and light, and the leaves and roots are very active, so that the cambium cells produce thicker walled cells, called summer wood. During the winter the trees rest, and no development takes place until spring, when the large thin-walled cells are formed again, making a sharp contrast with those formed at the end of the previous season. Fig-. 11. Diagram Showing Grain of Spruce Highly Magnified. PR, pith rays; BP, bordered pits; Sp W, spring wood; SW, summer wood; CC, overlapping of chisel shaped ends. THE STRUCTURE OF WOOD. 21 It is only at the tips of the branches that the cambium cells grow much in length; so that if a nail were driven into a tree twenty years old at, say, four feet from the ground, it would still be four feet from the ground one hundred years later. Looking once more at the cross-section, say, of spruce, the inner portion of each ring is lighter in color and softer in texture than the outer portion. On a radial or tangential section, one's finger nail can easily indent the inner portion of the ring, tho the outer dark part of the ring may be very hard. The inner, light, soft portion of the ring is the part that grows in the spring and early summer, and is called the "spring Fig-. 12.Diagram Showing- the Modeof Div i- wood" while the part that sion of lh . e ^ a bium . c * Us - . ? cambium cell is shaded to distinguish it from the crrnwQ lafpr in flip 5Pa RADIAL SECTlOri DIAMETERS HOM-POROU5 WOOD (WHITE Fig". 18. 28 WOOD AND FOREST. The cells of conifers are called tracheids, meaning "like trachece" They are cells in which the end walls persist, that is, are not ab- sorbed and broken down when they meet end to end. In other words, conifers do not have continuous pores or vessels or "trachea?" and hence are called "non-porous" woods. But in other woods, the ends' of some cells which meet endwise are ab- sorbed, thus forming a continuous series of elements which constitute an open tube. Such tubes are known as pores, or vessels, or "tracheae," and sometimes extend thru the whole stem. Besides this marked difference between the por- ous and non-porous woods, the porous woods are also distinguished by the fact that instead of being made up, like the conifers of cells of practically only one kind, namely tracheids, they are com- posed of several varieties of cells. Be- sides the tracheae and tracheids already noted are such cells as "wood fiber," "fibrous cells," and "parenchyma." Fig. 19. Wood fiber proper has much thick- ened lignified walls and no pits, and its main function is mechanical support. Fibrous cells are like the wood fibers except that they retain their proto- plasm. Parenchyma is composed of vertical groups of short cells, the end ones of each group tapering to a point, and each group originates from the transverse division of one cambium cell. They are commonly grouped around the vessels (tracheae). Parenchyma constitutes the pith rays and other similar fibers, retains its protoplasm, and becomes filled with starch in autumn. The most common type of structure among the broad-leaved trees contains tracheae, trachaeids, woody fiber, fibrous cells and paren- chyma. Examples are poplars, birch, walnut, linden and locust. In Fig-. 19. Isolated Fibers and Cells, a, four cells of wood parenchyma; , two cells from a pith ray; c, a single cell or joint of a vessel, the open- ings, x, x, leading into its up- per and lower neig-hbors; rf, tracheid; <, wood fiber proper. After Roth. THE STRUCTUKE OF WOOD. 29 some, as ash, the tracheids are wanting; apple and maple have no woody fiber, and oak and plum no fibrous cells. This recital is enough to show that the wood of the broad-leaved trees is much more complex in structure than that of the conifers. It DWME7ERS =*PITM RAYS CR055*5ECTfOtt l DIAMETERS PfTHR -PORE RADIAL SECTiOh TAN6EMT1AL SECTION RING-POROUS WOOD (WHITE ASH) Fig. 20. is by means of the number and distribution of these elements that particular woods are identified microscopically. See p. 289. Ring-porous woods. Looking thru the microscope at a cross-section of ash, a ring-porous wood, Fig. 20 : (1) The large round or oval pores or vessels grouped mostly in the spring wood first attract attention. Smaller ones, but still quite 30 WOOD AND FOREST. distinct, are to be seen scattered all thru the wood. It is by the num- ber and distribution of these pores that the different oak woods are distinguished, those in white oak being smaller and more numerous, while in red oak they are fewer and larger. It is evident that the greater their share in the volume, the lighter in weight and the weaker will be the wood. In a magnified cross-section of some woods, as black locust, white elm and chestnut, see Chap. Ill, beautiful pat- terns are to be seen composed of these pores. It is because of the size of these pores and their great number that chestnut is so weak. (2) The summer wood is also distinguishable by the fact that, as with the conifers, its cells are smaller and its cell walls thicker than those of the spring wood. The summer wood appears only as a nar- row, dark line along the largest pores in each ring. (3) The lines of the pith rays are very plain in some woods, as in oak. No. 47, Chap. III. (4) The irregular arrangement and (5) Complex structure are evident, and these are due to the fact that the wood substance consists of a number of different elements and not one (tracheids) as in the conifers. Looking at the radial section, Fig. 20 : (6) If the piece is oak, the great size of the medullary rays is most noticeable. Fig. 32, p. 38. They are often an inch or more wide ; that is, high, as they grow in the tree. In ash they are plain, seen thru the microscope, but are not prominent. (7) The interweaving of the different fibers and the variety of their forms show the structure as being very complex. In the tangential section,. Fig. 20 : (8) The pattern of the grain is seen to be marked not so milch by ihe denseness of the summer wood as by the presence of the ves- sels (pores). (9) The ends of the pith rays are also clear. In diffuse porous woods, the main features to be noticed are: In the transverse section, Fig. 21 : (1) The irregularity with which the pores are scattered, (2) The fine line of dense cells which mark the end of the year's growth, (3) The radiating pith rays, (4) The irregular arrangement and, ( 5 ) The complex structure. THE STRUCTURE OF WOOD. 81 In the radial section, Fig. 21 : (6) The pith rays are evident. In sycamore, Xo. 53, Chap. Ill, they are quite large. (7) The interweaving of the fibers is to be noted and also their varietv. PITH RAYS' CROSS-SECTION JTH RAYS 196 DIAMETERS RADIAL 5EXTIOn 37 DIAMETERS -POROUS WOOD CYELLOW POPLAR) Fig. 21. In the tangential section, Fig. 21 : (8) The grain is to be traced only dimly, but the fibers are seen to run in waves around the pith rays. (9) The pith rays, the ends of which are plainly visible. 32 WOOD AND FOREST. THE GRAIN OF WOOD. The term "grain" is used in a variety of meanings which is likely to cause confusion. This confusion may be avoided, at least in part, by distinguishing between grain and texture, using the word grain to refer to the arrangement or direction of the wood elements, and the word texture to refer to their size or quality, so far as these affect the structural character of the wood. Hence such qualifying adjectives as coarse and fine, even and uneven, straight and cross, including spiral, twisted, wavy, curly, mottled, bird's-eye, gnarly, etc., may all be applied to grain to give it definite meaning, while to texture the proper modifying adjectives are coarse and fine, even and uneven. Usually the word grain means the pattern or "figure" formed by the distinction between the spring wood and the summer wood. If the annual rings are wide, the wood is, in common usage, called "coarse grained," if narrow, "fine grained," so that of two trees of the same species, one may be coarse grained and the other fine grained, depending solely on the accident of fast or slow growth. The terms coarse grain and fine grain are also frequently used to distinguish such ring-porous woods as have large prominent pores, like chestnut and ash, from those having small or no pores, as cherry and lignum vitae. A better expression in this case would be coarse and fine textured. When such coarse textured woods are stained, the large pores in the spring wood absorb more stain than the smaller elements in the summer wood, and hence the former part appears darker. In the "fine grained" (or better, fine textured,) woods the pores are absent or are small and scattered, and the wood is hard, so that they are capable of taking a high polish. This indicates the meaning of the words coarse and fine in the mind of the cabinet- maker, the reference being primarily to texture. If the elements of which a wood are composed are of approxi- mately uniform size, it would be said to have a uniform texture, as in white pine, while uniform grain would mean, that the elements, tho of varying sizes, were evenly distributed, as in the diffuse-porous woods. The term "grain" also refers to the regularity of the wood struc- ture. An ideal tree would be composed of a succession of regular cones, but few trees are truly circular in cross-section and even in those that are circular, the pith is rarely in the center, showing that THE STRUCTURE OF WOOD. 33 one side of the tree, usually the south side, is better nourished than the other, Fig. 14, p. 23. The normal direction of the fibers of wood is parallel to the axis of the stem in which they grow. Such wood is called "straight- grained/' Fig. 22, but there are many deviations from this rule. Whenever the grain of the wood in a board is, in whole or in part. Fig-. 22. Straight Grained Long-leat Pine (full size). Fig-. 23. Mahog-any, Showing- Alte nately Twisted Grain (full size). Alter- oblique to the sides of the board, it is called "cross-grained/' An il- lustration of this is a bend in the fibers, due to a bend in the whole tree or to the presence of a neighboring knot. This bend makes the board more difficult to plane. In many cases, probably in more cases than not, the wood fibers twist around the tree. (See some of the logs in Fig. 107, p. 254.) This produces "spiral" or "twisted" grain. WOOD AND FOREST. Fig-. 24. Spiral Grain in Cypress. After Roth. Often, as in mahogany and sweet gum, the fibers of several layers twist first in one direc- tion and then those of the next few layers twist the other way, Fig. 24. Such wood is pecu- liarly cross-grained, and is of course hard to plane smooth. But when a piece is smoothly finished the changing reflec- tion of light from the surface gives a beautiful appearance, which can be enhanced by staining and polishing. It Fig-. 25. Planed Surface of Wavy-Grained Maple (full size). Fig-. 26. Split Surface of Wavy-Grained Maple (full size). THE STRUCTURE OF WOOD. 35 constitutes the characteristic "grain" of striped mahogany, Fig. 23. It is rarely found in the inner part of the tree. Sometimes the grain of wood is "cross/' because it is "wavy" either in a radial or a tangential section, as in maple, Fig. 25, and Fig. 26. "Curly grain" refers to the figure of circlets and islets and con- tours, often of great beauty, caused by cutting a flat surface in .big. 47. Curi> Grained L,ong-ieai Pine (full size). Fig- 28. Curly Yellow Poplar (full size). crooked-grained wood. See Fig. 27, curly long-leaf pine, and Fig. 28, yellow poplar. When such crookedness is fine and the fibers are con- torted and, as it were, crowded out of place, as is common in and near the roots of trees, the effect is called "burl," Fig. 29. The term burl is also used to designate knots and knobs on tree trunks, Fig. 31, Burl is used chiefly in veneers. 36 WOOD AND FOREST. Irregularity of grain is often caused by the presence of adventi- tious and dormant buds, which may be plainly seen as little knobs on the surface of some trees under the bark. In most trees, these irregularities are soon buried and smoothed over by the successive an- nual layers of wood, but in some woods there is a tendency to pre- serve the irregularities. On slash (tangent) boards of such wood, Fig. 29. Redwood Burl (full size). Fig. 30. Bird's-eye Maple (full size). a great number of little circlets appear, giving a beautiful grain, as in "Bird's-eye maple," Fig. 30. These markings are found to pre- dominate in the inner part of the tree. This is not at all a distinct variety of maple, as is sometimes supposed, but the common variety, in which the phenomenon frequently appears. Logs of great value, having bird's-eyes, have often unsuspectingly been chopped up for fire wood. THE STRUCTURE OF WOOD. 37 The term "grain" may also mean the "figure" formed by the presence of pith rays, as in oak, Fig. 32, or beech, or the word "grain" may refer simply to the uneven deposit of coloring matter as is com- mon in sweet gum, Fig. 33, black ash, or Circassian walnut. The presence of a limb constitutes a knot and makes great irregu- larity in the grain of wood, Fig. 34. In the first place, the fibers on the upper and lower sides of the limb behave differently, those on the lower side running un- interruptedly from the stem into the limb, while on the upper side the fibers bend aside making an imperfect connection. Consequently to split a knot it is always neces- sary to start the split from the lower side. On the other hand it is eas- ier to split around a knot than thru it. The texture as well as the grain of wood is modi- fied by the presence of a branch. The wood in and around a knot is much harder than the main body of the trunk on account of the crowd- ing together of the ele- ments. Knots are the remnants of branches left in the trunk. These once had all tht parts of the trunk itself, namely bark, cambium, wood, and pith. Nor- mally, branches grow from the pith, tho some trees, as Jack pine and redwood, among the conifers, and most of the broad-leaf trees have the power of putting out at any time adventitious buds which may develop into branches. When a branch dies, the annual layer of wood no longer grows upon it, but the successive layers of wood on Fig. 31. Bnrl on White Oak. 38 WOOD AND FOREST. the trunk itself close tighter and tighter around it, until it is broken off. Then, unless it has begun to decay, it is successively overgrown by annual layers, so that no sign of it appears until the trunk is cut open. A large trunk perfectly clean of branches on the outside may have many knots around its center, remnants of branches which grew there in its youth, as in Fig. 34, and Fig. 8, p. 18. The general ef- Fig. 32. Figure Formed by Pith Rays in Oak (full size). Fig 33. Sweet Gum, Showing- Uneven Deposit of Coloring Matter (full size.) feet of the presence of a knot is, that the fibers that grow around and over it are bent, and this, of course, produces crooked grain. Following are the designations given to different knots by lumber- men: A sound knot is one which is solid across its face and is as hard as the wood surrounding it and fixed in position. A pin knot is sound, but not over y^" in diameter. A standard .knot is sound, THE STRUCTURE OF WOOD. 39 but not over \y 2 " in diameter. A large knot is sound, and over lJ/" in diameter. A spike knot is one sawn in a lengthwise position. A dead, or, loose knot is one not firmly held in place by growth or position. (4) Pith. At the center or axis of the tree is the pith or medulla, Fig. 34. In every bud, that is, at the apex of every stem and branch, the pith is the growing part; but as the stem lengthens and becomes overgrown by successive layers of wood the pith loses its vital function. It does not grow with the plant except at the buds. It varies in thickness, being very small, ' hardly more than 1/16", in cedar and larch, and so small in oak as to be hardly discernible; and what there is of it turns hard and dark. In herbs and shoots it is relatively large, Fig. 5, p. 15, in a three- year old shoot of el- der, for example, be- ing as wide as the wood. In elder, moreover, it dies early and pul- verizes, leaving the stem hollow. Its function is one of only tem- porary value to the plant. Fig". 34. Section Thru the Trunk of a Seven Year Old Tree, Showing- Relation of Branches to Main Stem. A, B, two branches which were killed after a few years' growth by shading-, and which have been overgrown by the annual ring's of wood; C, a limb which lived four years, then died and broke off near the stem, leaving- the part to the left of XY a "sound" knot, and the part to the right a "dead" knot, which unless rotting- sets in, would in time be entirely covered by the growing- trunk; D, a branch that has remained alive and has in- creased in size like the main stem; P, P, pith of both stem and limb. 40 WOOD AND FOREST. THE STRUCTURE OF WOOD. REFERENCES : * Roth, Forest Bull. No. 10, pp. 11- 23. Boulger, pp. 1-39. Sickles, pp. 11-20. Pinchot, Forest Bull. No. 24, I, pp. 11-24. Keeler, pp. 514-517. Curtis, pp. 62-85. Woodcraft, 15: 3, p. 90. Bitting, Wood Craft, 5: 76, 106, 144, 172, (June-Sept. 1906). Ward, pp. 1-38. Encyc. Brit., llth Ed., "Plants," p. 741. Strasburger, pp. 120-144 and Part II, Sec. II. Snow, pp. 7-9, 183. general bibliography, see p. 4. CHAPTER II. PROPERTIES OF WOOD. There are many properties of wood, some predominant in one species, some in another,, that make it suitable for a great variety of uses. Sometimes it is a combination of properties that gives value to a wood. Among these properties are hygroscopicity, shrinkage, weight, strength, cleavability, elasticity, hardness, and toughness. THE HYGROSCOPICITY 1 OF WOOD. It is evident that water plays a large part in the economy of the tree. It occurs in wood in three different ways: In the sap which fills or partly fills the cavities of the wood cells, in the cell walls which it saturates, and in the live protoplasm, of which it constitutes 90 per cent. The younger the wood, the more water it contains, hence the sap-wood contains much more than the heart-wood, at times even twice as much. In fresh sap-wood, 60 per cent, of the water is in the cell cavities, 35 per cent, in the cell walls, and only 5 per cent, in the protoplasm. There is so much water in green wood that a sappy pole will soon sink when set afloat. The reason why there is much less water in heart-wood is because its cells are dead and inactive, and hence with- out sap and without protoplasm. There is only what saturates the cell walls. Even so, there is considerable water in heart-wood. 2 hygroscopicity, "the property possessed by vegetable tissues of absorb- ing or discharging moisture and expanding or shrinking accordingly." Century Dictionary. 2 This is shown by the following table, from Forestry Bulletin No. 10, p. 31, Timber, by Filibert Roth: POUNDS OF WATER LOST IN DRYING 100 POUNDS OF GREEN WOOD IN THE KILN. Sap-wood or Heart- wood outer part, or interior. 1. Pines, cedars, spruces, and firs 45-65 16-25 2. Cypress, extremely variable 50-65 18-60 3. Poplar, cottonwood, basswood 60-65 40-60 4. Oak, beech, ash, elm, maple, birch, hickory, chestnut, walnut, and sycamore 40-50 30-40 41 42 WOOD AND FOREST. The lighter kinds have the most water in the sap-wood, thus sycamore has more than hickory. Curiously enough, a tree contains about as much water in winter as in summer. The water is held there, it is supposed, by capillary attraction, since the cells are inactive, so that at all times the water in wood keeps the cell walls distended. THE SHRINKAGE OF WOOD. When a tree is cut down, its water at once begins to evaporate. This process is called "seasoning." 1 In drying, the free water within the cells keeps the cell walls saturated; but when all the free water has been removed, the cell walls begin to yield up their moisture. Water will not flow out of wood unless it is forced out by heat, as when green wood is put on a fire. Ordinarily it evaporates slowly. The water evaporates faster from some kinds of wood than from other kinds, e. g., from white pine than from oak, from small pieces than from large, and from end grain than from a longitudinal sec- tion ; and it also evaporates faster in high than in low temperatures. Evaporation affects wood in three respects, weight, strength, and size. The weight is reduced, the strength is increased, and shrinkage takes place. The reduction in weight and increase in strength, im- portant as they are, are of less importance than the shrinkage, which often involves warping and other distortions. The water in wood affects its size by keeping the cell walls distended. If all the cells of a piece of wood were the same size, and had walls the same thickness, and all ran in the same direction, then the shrinkage would be uniform. But, as we have seen, the structure of wood is not homogeneous. Some cellular elements are large, some small, some have thick walls, some thin walls, some run longitudinally and some (the pith rays) run radially. The effects will be various in differently shaped pieces of wood but they can easily be accounted for if one bears in mind these three facts : ( 1 ) that the shrinkage is in the cell wall, and therefore (2) that the thick-walled cells shrink more than thin-walled cells and (3) that the cells do not shrink much, if any, lengthwise. (1) The shrinkage of wood takes place in the walls of the cells that compose it, that is, the cell walls become thinner, as indicated by the dotted lines in Fig. 35, which is a cross-section of a single cell. *See Handwork in Wood, Chapter III. PROPERTIES OF WOOD. 43 The diameter of the whole cell becomes less, and the opening, or lumen, of the cell becomes larger. (2) Thick-walled cells shrink more than thin-walled cells, that is, summer cells more than spring cells. This is due to the fact that they contain more shrinkable substance. The thicker the wall, the more the shrinkage. Consider the effects of these changes; ordinarily a log when drying begins to "check'' at the end. This is to be ex- plained thus: Inasmuch as evaporation takes place faster from a cross than from a lon- gitudinal section, because at the cross-section all the cells are cut open, it is to be expected that the end of a piece of timber, Fig. 36, A, will shrink first. This would tend to make the end fibers bend toward the center of the piece as in B, Fig. 36. But the fibers are stiff and resist this bend- ing with the result that the end splits or "checks" as in C, Fig. 36. But later, as the rest of the timber dries out and shrinks, it becomes of equal thickness again and the "checks" tend to close. (3) For some reason, which has not been discovered, the cells or fibers of wood do not shrink in length to any appreciable extent. Fig-. 35. How Cell Walls Shrink. Fig-. 36. The Shrinkage and Checking- at the End of a Beam. This is as true of the cells of pith rays, which run radially in the log, as of the ordinary cells, which run longitudinally in it. In addition to "checking" at the end, logs ordinarily show the effect of shrinkage by splitting open radially, as in Fig. 37. This is 44 WOOD AND FOREST. to be explained by two factors, (1) the disposition of the pith (or medullary) rays, and (2) the arrangement of the wood in annual rings. (1) The cells of the pith rays, as we have seen in Chapter I, run at right angles to the direction of the mass of wood fibers, and since they shrink according to the same laws that other cells do, viz., by the cell wall becoming thinner but not shorter, the strain of their shrinkage is contrary to that of the main cells. The pith rays, which consist of a number of cells one above the other, tend to shrink parallel to the length of the wood, and what- ever little longitudinal shrinkage there is in a board is probably due mostly to the shrinkage of the pith rays. But because the cells of pith rays do not appre- ciably shrink in their length, this fact tends to prevent the main body of wood from shrinking radially, and the result is that wood shrinks less radially than tangentially. Tangentially is the only way left for it to shrink. The pith rays may be compared to the ribs of a folding fan, which keep the radius of unaltered length while permitting comparative freedom for circumferential contraction. (2) It is evident that since summer wood shrinks more than spring wood, this fact will interfere with the even shrinkage of the log. Consider first the tangen- tial shrinkage. If a section of a single annual ring of green wood of the shape A B C D, in Fig. 38, is dried and the mass shrinks according to the thickness of the Fig. 37. The Shrinkage and Splitting of a Log. Fig. 38. Diagram to Show the Greater Shrinkage of Summer Cells, A, B, than of Spring Cells, C, D. cell walls, it will assume the shape A' B' C' D'. When a num- ber of rings together shrink, the tangential shrinkage of the summer wood tends to contract the adjoining rings of spring wood more than they would naturally shrink of themselves. Since there is more of PROPERTIES OF WOOD. 45 the summer-wood substance, the spring-wood must yield, and the log shrinks circumferentially. The radial shrinkage of the summer-wood, however, is constantly interrupted by the alternate rows of spring- wood, so that there would not be so much radial as circumferential shrinkage. As a matter of fact, the tangential or circumferential shrinkage is twice as great as the radial shrinkage. Putting these two factors together, namely, the length- wise resistance of the pith rays to the radial shrinkage of the mass of other fibers, and sec- ond, the continuous bands of summer wood, comparatively free to shrink circumferentially, and the inevitable happens; the log splits. If the bark is left on and evaporation hindered, the splits will not open so wide. There is still another effect of shrinkage. If, immediately after felling, a log is sawn in two lengthwise, the radial splitting may be largely avoided, but the flat sides will tend to become convex, as in Fig. 39. This is ex- plained by the fact that circumferential shrinkage is greater than radial shrinkage. If a log is "quartered," 1 the quarters split still less, as the inevitable shrinkage takes place more easily. The quarters then tend to assume the shape shown in Fig. 40, C. If a log is sawed into timber, it checks from the center of the faces toward the pith, Fig. 40, D. Sometimes the whole amount of shrinkage may be collected in one large split. When a log is slash-sawed, Fig. 40, I, each board tends to warp so that the concave side is away from the center of the tree. If one plank includes the pith, Fig. 40, E and H, that board will become thinner at its edges than at its center, i. e., convex on both faces. Other forms assumed by wood in shrinking are shown in Fig. 40. In the cases A-F the explanation is the same; the circumferential shrinkage is more than the radial. In J and K the shapes are ac- counted for by the fact that wood shrinks very little longitudinally. ^ee Handwork in Wood, p. 42. Fig". 39. Shrinkag-e of a Halved Log". 46 WOOD AND FOREST. Fig. 40. Shapes Assumed by Wood in Shrinking-. PROPERTIES OF WOOD. 47 Warping is uneven shrinkage, one side of the board contracting more than the other. Whenever a slash board warps under ordinary conditions, the convex side is the one which was toward the center of the tree. However, a board may be made to warp artificially the other way by applying heat to the side of the board toward the center of the tree, and by keeping the other side moist. The board will warp only sidewise; lengthwise it remains straight unless the treatment is very severe. This shows again that water distends the cells laterally but not longitudinally. The thinning of the cell walls due to evaporation, is thus seen to have three results, all included in the term "working," viz. : shrinkage., a diminution in size, splitting, due to the inability of parts to cohere under the strains to which they are subjected, and warping, or uneven shrinkage. In order to neutralize warping as much as possible in broad board structures, it is common to joint the board with the annual rings of each alternate board curving in opposite directions, as shown in Handwork in Wood, Fig. 280, a, p. 188. Under warping is included bowing. Bowing, that is, bend- ing in the form of a bow, is, so to speak, longitudinal warp- ing. It is largely due to crookedness or irregularity of grain, and is likely to occur in boards with large pith rays, as oak and sycamore. But even a straight-grained piece of wood, left standing on end or subjected to heat on one side and dampness on the other, will bow, as, for instance a board lying on the damp ground and in the sun. Splitting takes various names, according to its form in the tree. "Check" is a term used for all sorts of cracks, and more particularly for a longitudinal crack in timber. "Shakes" are splits of various forms as : star shakes, Fig. 41, a, splits which radiate froro Fig-. 41. a, Star Shakes; 6, Heart Shakes; c, Cup Shakes or Ring- Shakes; d, Honey- combing-. 48 WOOD AND FOREST. the pith along the pith rays and widen outward; heart shakes, Fig. 41, I, splits crossing the central rings and widening toward the cen- ter; and cup or ring shakes, Fig. 41, c, splits between the annual rings. Honeycombing, Fig. 41, d, is splitting along the pith rays and is due largely to case hardening. These are not all due to shrinkage in drying, but may occur in the growing tree from various harmful causes. See p. 232. Wood that has once been dried may again be swelled to nearly if not fully its original size, by being soaked in water or subjected to wet steam. This fact is taken advantage of in wetting wooden wedges to split some kinds of soft stone. The processes of shrinking and swelling can be repeated indefinitely, and no temperature short of burning, completely prevents wood from shrinking and swelling. Eapid drying of wood tends to "case harden" it, i. e., to dry and shrink the outer part before the inside has had a chance to do the same. This results in checking separately both the outside and the inside, hence special precautions need to be taken in the seasoning of wood to prevent this. When wood is once thoroly bent out of shape in shrinking, it is very difficult to straighten it again. Woods vary considerably in the amounts of their shrinkage. The conifers with their regular structure shrink less and shrink more evenly than the broad-leaved woods. 3 Wood, even after it has been well seasoned, is subject to frequent changes in volume due to the varying amount of moisture in the atmosphere. This involves con- stant care in handling it and wisdom in its use. These matters are considered in Handwork in Wood, Chapter III, on the Seasoning of Wood. 3 The following table from Roth, p. 37, gives the approximate shrinkage of a board, or set of boards, 100 inches wide, drying in the open air: Shrinkage Inches. 1. All light conifers (soft pine, spruce, cedar, cypress) , 3 2. Heavy conifers (hard pine, tamarack, yew) honey locust, box elder, wood of old oaks ) 4 3. Ash, elm, walnut, poplar, maple, beech, sycamore, cherry, black locust. 5 4. Basswood, birch, chestnut, horse chestnut, blue beech, young locust. ... 6 5. Hickory, young oak, especially red oak Up to 10 The figures are the average of radial and tangential shrinkages. PROPERTIES OF WOOD. 49 THE WEIGHT OF WOOD. Wood substance itself is heavier than water, as can readily be proved by immersing a very thin cross-section of pine in water. Since the cells are cut across, the water readily enters the cavities, and the wood being heavier than the water, sinks. In fact, it is the air en- closed in the cell cavities that ordinarily keeps wood afloat, just as it does a corked empty bottle, altho glass is heavier than water. A longitudinal shaving of pine will float longer than a cross shaving for the simple reason that it takes longer for the water to penetrate the cells, and a good sized white pine log would be years in getting water-soaked enough to sink. As long as a majority of the cells are filled with air it would float. In any given piece of wood, then, the weight is determined by two factors, the amount of wood substance and the amount of water contained therein. The amount of wood substance is constant, but the amount of water contained is variable, and hence the weight va- ries accordingly. Moreover, considering the wood substance alone, the weight of wood substance of different kinds of Avood is about the same; namely, 1.6 times as heavy as water, whether it is oak or pine, ebony or poplar. The reason why a given bulk of some woods is lighter than an equal bulk of others, is because there are more thin- walled and air-filled cells in the light woods. Many hard woods, as lignum vitae, are so heavy that they will not float at all. This is because the wall of the wood cells is very thick, and the lumina are small. In order, then, to find out the comparative weights of different woods, that is, to see how much wood substance there is in a given volume of any wood, it is necessary to test absolutely dry specimens. The weight of wood is indicated either as the weight per cubic foot or as specific gravity. It is an interesting fact that different parts of the same tree have different weights, the wood at the base of the tree weighing more than that higher up, and the wood midway between the pith and bark weighing more than either the: center or the outside. 4 4 How much different woods vary may be seen by the following table, taken from Filibert Roth, Timber, Forest Service Bulletin No. 10, p. 28: 50 WOOD AND FOREST. The weight of wood has a very important bearing upon its use. A mallet-head, for example, needs weight in a small volume, but it must also be tough to resist shocks, and elastic so as to impart its momentum gradually and not all at once, as an iron head does. Weight is important, too, in objects of wood that are movable. The lighter the wood the better, if it is strong enough. That is why spruce is valuable for ladders ; it is both light and strong. Chestnut would be a valuable wood for furniture if it were not weak, especially in the spring wood. The weight of wood is one measure of its strength. Heavy wood is stronger than light wood of the same kind, for the simple reason WEIGHT OF KILX-DRIED WOOD OF DIFFERENT SPECIES. Specific weight. Weight of 1 cubic foot. 1,000 feet of lumber. (a) Very heavy woods: Hickory, oak, persimmon, osage orange, black locust, hackberry, blue beech, best of elm,, and ash. (b) Heavy woods: Ash, elm, cherry^ birch, maple, beech, walnut, sour gum, coffee tree, honey locust, best of south- ern pine, and tamarack 0.70-0.80 .60- .70 .50- .60 .40- .50 .30- .40 Pounds 42-48 36-42 30-36 24-30 18-24 Pounds 3,700 3,200 2,700 2,200 1,800 (c) Woods of medium weight: Southern pine, pitch pine, tamar- ack, Douglas spruce, western hemlock, sweet gum, soft maple, sycamore, sassafras, mulberry, light grades of birch and cherry. . (d) Light woods: Norway and bull pine, red cedar, cypress, hemlock, the heavier spruce and fir, redwood, bass- wood, chestnut, butternut, tulip, catalpa, buckeye, heavier grades (e) Very light woods: White pine, spruce, fir, white ce- dar, poplar Approximate. PROPERTIES OF WOOD. 51 that weight and strength are dependent upon the number and com- pactness of the fibers. 5 THE STRENGTH OF WOOD. Strength is a factor of prime importance in wood. By strength is meant the ability to resist stresses,, either of tension (pulling), or of compression (pushing), or both together, cross stresses. When a horizontal timber is subjected to a downward cross stress, the lower half is under tension, the upper half is under compression and the line between is called the neutral axis, Fig. 42. Htutral Ax/5 Fig. 42. A Timber Under Cross Stress, Showing- Neutral Axis, and the Lines of Tension and Compression. A knot occurring in such a timber should be in the upper half, as at A. Wood is much stronger than is commonly supposed. A hickory bar will stand more strain under tension than a wrought iron bar of the same length and weight, and a block of long-leaf pine a greater compression endwise than a block of wrought iron of the same height and weight. It approaches the strength of cast iron under the same conditions. Strength depends on two factors: the strength of the individual fibers, and the adhesive power of the fibers to each other. So, when a piece of wood is pulled apart, some of the fibers break and some are pulled out from among their neighbors. Under compression, how- ever, the fibers seem to act quite independently of each other, each bending over like the strands of a rope when the ends are pushed together. As a consequence, we find that wood is far stronger under tension than under compression, varying from two to four times. 5 For table of weights of different woods see Sargent, Jeswp Collection^ pp. 153-157. 52 WOOD AND FOREST. Woods do not vary nearly so much under compression as under tension, the straight-grained conifers, like larch and longleaf pine, being nearly as strong under compression as the hard woods, like hickory and elm, which have entangled fibers, whereas the hard woods are nearly twice as strong as the conifers under tension. Moisture has more effect on the strength of wood than any other extrinsic condition. In sound wood under ordinary conditions, it outweighs all other causes which affect strength. When thoroly sea- soned, wood is two or three times stronger, both under compression and in bending, than when / N green or water soaked. 6 The tension or pulling strength of wood is much af- fected by the direction of the grain, a cross-grained piece be- ing only l/10th to l/20th as strong as a straight-grained piece. But under compression there is not much difference; so that if a timber is to be subjected to cross strain, that is the lower half under tension and the upper half under com- pression, a knot or other cross- grained portion should be in the upper half. Strength also includes the ability to resist shear. This is called "shearing strength." It is a measure of the adhesion of one part of the wood to an adjoining part. Shearing is what takes place when the portion of wood beyond a mortise near the end of a timber, A B C D, Fig. 43, is forced out by the tenon. In this case it would be shearing along the grain, sometimes called detrusion. The resist- ance of the portion A B C D, i. e., its power of adhesion to the wood adjacent to it on both sides, is its shearing strength. If the mortised piece were forced downward until it broke off the tenon at the shoul- der, that would be shearing across the grain. The shearing resistance either with or across the grain is small compared with tension and compression. Green wood shears much more easily than dry, be- Fig-. 43. Shearing- Strength is Measured by the Adhesion of the Portion A, B, C, D or to the Wood on both sides of it. 6 See Forestry Bulletin No. 70, pp. 11, 12, and Forestry Circular No. 108. PROPERTIES OF WOOD. 53 cause moisture softens the wood and this reduces the adhesion of the fibers to each other. 7 CLEAVABILITY OF WOOD. Closely connected with shearing strength is cohesion, a property usually considered under the name of its opposite, cleavability, i. e., the ease of splitting. When an ax is stuck into the end of a piece of wood, the wood splits in advance of the ax edge. See Handwork in Wood, Fig. 59, p. 52. The wood is not cut but pulled across the grain just as truly as if one edge were held and a weight were attached to the other edge and it were torn apart by tension. The length of the cleft ahead of the blade is determined by the elasticity of the wood. The longer the cleft, the easier to split. Elasticity helps splitting, and shearing strength and hardness hinder it. A normal piece of wood splits easily along two surf ices, (1) along any radial plane, principally because of the presence of the pith rays, and, in regular grained wood like pine, because the cells are radially regular; and (2) along the annual rings, because the spring-wood sep- arates easily from the next ring of summer-wood. Of the two, radial cleavage is 50 to 100 per cent, easier. Straight-grained wood is much easier to split than cross-grained wood in which the fibers are inter- laced, and soft wood, provided it is elastic, splits easier than hard. Woods with sharp contrast between spring and summer wood, like yellow pine and chestnut, split very easily tangentially. All these facts are important in relation to the u?e of nails. For instance, the reason why yellow pine is hard to nail and bass easy is because of their difference in cleavability. ELASTICITY OF WOOD. Elasticity is the ability of a substance when forced out of shape, bent, twisted, compressed or stretched, to regain its former shape. When the elasticity of wood is spoken of, its ability to spring back from bending is usually meant. The opposite of elasticity is brittle- ness. Hickory is elastic, white pine is brittle. Tor table of strengths of different woods, see Sargent, Jesup Collection, pp. 166 ff. 54 WOOD AND FOREST. Stiffness is the ability to resist bending, and hence is the opposite of pliability or flexibility. A wood may be both stiff and elastic; it may be even stiff and pliable, as ash, which may be made into splints for baskets and may also be used for oars. Willow sprouts are flexible when green, but quite brittle when dry. Elasticity is of great importance in some uses of wood, as in long tool handles used in agricultural implements, such as rakes, hoes, scythes, and in axes, in archery bows, in golf sticks, etc., in all of which, hickory, our most elastic wood, is used. 8 HARDNESS OF WOOD. Hardness is the ability of wood to resist indentations, and de- pends primarily upon the thickness of the cell walls and the small- ness of the cell cavities, or, in general, upon the density of the wood structure. Summer wood, as we have seen, is much harder than spring wood, hence it is important in using such wood as yellow pine on floors to use comb-grain boards, so as to present the softer spring wood in as narrow surfaces as possible. See Handwork in Wood, p. 41, and Fig. 55. In slash-grain boards, broad surfaces of both spring and summer wood appear. Maple which is uniformly hard makes the best floors, even better than oak, parts of which are com- paratively soft. The hardness of wood is of much consequence in gluing pieces to- gether. Soft woods, like pine, can be glued easily, because the fibers can be forced close together. As a matter of fact, the joint when dry is stronger than the rest of the board. In gluing hard woods, how- ever, it is necessary to scratch the surfaces to be glued in order to insure a strong joint. It is for the same reason that a joint made with liquid glue is safe on soft wood when it would be weak on hard wood. 9 TOUGHNESS OF WOOD. Toughness may be defined as the ability to resist sudden shocks and blows. This requires a combination of various qualities, strength, hardness, elasticity and pliability. The tough woods, par excellence, 8 For table of elasticity of different woods, see Sargent, Jesup Collection, pp. 163 ff. "For table of hardnesses of different woods, see Sargent, Jesup Collec- tion, pp. 173 ff. PROPEKTIES OP WOOD. 55 are hickory, rock elm and ash. They can be pounded, pulled, com- pressed and sheared. It is because of this quality that hickory is used for wheel spokes and for handles, elm for hubs, etc. In the selection of wood for particular purposes, it is sometimes one, sometimes another, and more often still, a combination of quali- ties that makes it fit for use. 10 It will be remembered that it was knowledge of the special values of different woods that made "the one horse shay/' "The Deacon's Masterpiece." "So the Deacon inquired of the village folk Where he could find the strongest oak, That couldn't be split nor bent nor broke, That was for spokes and floor and sills; He sent for lancewood to make the thills; The cross bars were ash, from the straightest trees, The panels of whitewood, that cuts like cheese, But lasts like iron for things like these. The hubs of logs from the "Settler's Ellum," Last of its timber, they couldn't sell 'em. Never an ax had seen their chips, And the wedges flew from between their lips, Their blunt ends frizzled like celery tips; Step and prop-iron, bolt and screw, Spring, tire, axle and linch pin too, Steel of the finest, bright and blue; Thorough brace, bison skin, thick and wide; Boot, top dasher from tough old hide, Found in the pit when the tanner died. That was the way to "put her through." 'There!' said the Deacon, 'naow she'll dew!'" 10 For detailed characteristics of different woods see Chapter III. 56 WOOD AND FOREST. THE PROPERTIES OF WOOD. REB^ERENCES* Moisture and Shrinkage. Roth, For. Bull., No. 10, pp. 25- Busbridge, Sci. Am. Sup. No. 1500. 37. Oct. 1, '04. Weight, Strength, Cleavability, Elasticity and Toughness. Roth, For. Bull., 10, p. 37-50. Roth, First Book, pp. 229-233. Boulger, pp. 89-108, 129-140. Sargent, Jesup Collection, pp. 153- 176. Forest Circulars Nos. 108 and 139. *For general bibliography, see p. 4. CHAPTER 111. THE PKINCIPAL SPECIES OF AMEKICAN WOODS. NOTES. The photographs of tangential and radial sections are life size. The microphotographs are of cross-sections and are enlarged 37^> diameters. Following the precedent of U. S. F'orest Bulletin No. 17, Sud- worth's Check List of the Forest Trees of the United States, the com- plicated rules for the capitalization of the names of species are aban- doned and they are uniformly not capitalized. On pages 192-195 will be found lists of the woods described, ar- ranged in the order of their comparative weight, strength, elasticity, and hardness. These lists are based upon the figures in Sargent's The Jesup Collection. In the appendix, p. 289, will be found a key for distinguishing the various kinds of w r ood. Information as to current wholesale prices in the principal mar- kets of the country can be had from the U. S. Dept. of Agriculture, The Forest Service, Washington, D. C., Record of Wholesale Prices of Lumber, List A. These lists are published periodically. No at- tempt is made in this book to give prices because: (1) only lists of wholesale prices are available; (2) the cuts and grades differ consid- erably, especially in soft woods (conifers) ; (3) prices are constantly varying; (4) the prices differ much in different localities. 57 58 WOOD AND FOREST. Habitat. WHITE PINE, WEYMOUTH PINE. Named for Lord Weymouth, who cultivated it in England. Pinus strobus Linnaeus. Pinus, the classical Latin name; strobus refers to the cone, or strobile, from a Greek word, strobus, meaning twist. Habitat: (See map) ; now best in Michigan, Wisconsin and Minnesota. Characteristics of the Tree: Height, 100'-120', even 200' ; diameter, 2'-4' ; branches in whorls, cleans poorly; bark, dark gray, divided by deep longitu- dinal fissures into broad ridges; leaves in clusters of 5, 3"-5" long; cone drooping, 4"-10" long. Appearance of Wood: Color, heart-wood, very light brown, almost cream color, sap-wood, nearly white; non-porous; rings, fine but distinct; grain, straight; pith rays, very faint; resin ducts, small, inconspicuous. Physical Qualities : Weight, very light (59th in this list), 27 Ibs. per cu. ft.; sp. gr. 0.3854; strength, medium (55th in this list; elasticity, me- dium (47th in this list) ; soft (57th. in this list); Leaf. SPECIES OF WOODS. 59 shrinkage 3 per cent; warps very little; durability, moderate; works easily in every way; splits easily but nails well. Common Uses : Doors, window sashes and other carpentry, cabinet-work, matches. pattern-making. Remarks: This best of American woods is now rapidly becoming scarce and higher in price. Its uses are due to its uniform grain, on account of which it is easily worked and stands well. Known in the English market as yellow pine. Radial Section, life size. Cross-section, magnified 37^ diameters. Tangential Section, life size. 60 "WOOD AND FOREST. 2 WESTERN WHITE PINE. Pinus monticola Douglas. Pinus, the classical Latin name; monticola means mountain-dweller. i * Habitat. Leaf. Habitat: (See map) ; grows at great elevations, 7,000'-10,000'. Best in northern Idaho. Characteristics of the Tree: Height, 100VL60'; diameter, 4' to even 8'; branches, slender, spread- ing; bark, gray and brown, divided into squar- ish plates by deep longi- tudinal and cross fissures; leaves, 5 in sheath; cones, 12"xl8" long. Appearance of Wood: Color, light brown or red, sap-wood nearly white ; non-porous ; rings, sum- mer wood, thin and not conspicuous ; grain, straight; rays, numerous, obscure; resin ducts, nu- merous and conspicuous tho not large. Physical Qualities : Weight, very light (58th SPECIES OF WOODS. 61 in this list), 24 Ibs. per cu. ft., sp. gr. 0.3908; strength, medium (56th in this list) ; elastic (35th in this list) ; soft (63d in this list) ; shrinkage, 3 per cent; warps little; moderately durable; easy to work; splits readily but nails well. Common Uses: Lumber for construc- tion and interior finish. Remarks: Closely resembles Pinus Strobus in appearance and quality of wood. Radial Section, life size. Cross-section, magnified 37^ diameters. Tangential Section, life size. 62 SPECIES OF WOODS. SUGAR PINE. Sugar refers to sweetish exudation. Pinus lambertiana Douglas. Pinus, the classical Latin name; lambertiana, from the botanist, A. B. Lambert, whose chief work was on Pines. Habitat. Leaf. Habitat: (See map) ; grows on high elevations (5,000'), best in northern California, Characteristics of the Tree: Height, 100'-300'; diameter, 1 5"-20" ; branches, in remote reg- ular whorls; bark, rich purple or brown, thick, deep irregular fissures making long, flaky ridges ; leaves, stout, rigid, in bundles of five; cones, 10"-18" long. Appearance of Wood: Color, pinkish brown, sap- wood, cream white; non- porous ; rings, distinct ; grain, straight; rays, nu- merous, obscure ; resin ducts, numerous, large and conspicuous. Physical Qualities : Weight, very light (61st SPECIES OF WOODS. 63 in this list), 22 Ibs. per cu. ft., sp. gr. 0.3684; strength, weak (59th in this list) ; elasticity, medium (56th in this list) ; soft (53d in this list) ; shrink- age, 3 per cent; warps little; durable; easily worked; splits little, nails well. Common Uses: Carpentry, interior finish, doors, blinds, shingles, barrels, etc. Remarks: Exudes a sweet substance from heart-wood. A magnificent and important lumber tree on Pacific coast. Radial Section, life size. Cross-sectien, magnified 37 1 / 2 diameters. Tangential Section, life cize. Habitat. 64 WOOD AND FOREST. 4 NORWAY PINE. EED PINE. Red refers to color of bark. Pinus resinosa Solander. Pinus, the classical Latin name; resinosa refers to very resinous wood. Habitat: (See map) ; grows best in northern Michigan, Wisconsin, and Minnesota. Characteristics of the Tree: Height, 70'-90'; diameter, 2'-3' ; tall, straight ; branches in whorls, low; bark, thin, scaly, purplish and red- dish-brown ; longitudinal furrows, broad flat ridges; leaves, in twos in long sheaths; cones, 2". Appearance of Wood: Color of wood, pale red, sap-wood, wide, whitish; non-porous ; rings sum- mer wood broad, dark; grain, straight; rays, nu- merous, pronounced, thin; very resinous, but ducts small and few. Physical Qualities : Leaf. Weight, light, 43d in this SPECIES OF WOODS. 65 list), 31 Ibs. per cu. ft., sp. gr. 0.4854; strong (39th in this list) ; elastic (16th in this list) ; soft (48th in this list) ; shrinkage, 3 per cent; warps moder- ately ; not durable ; easy to work ; splits readily, nails well. Common Uses: Piles, electric wire poles, masts, flooring. Remarks: Often sold with and as white pine. Eesembles Scotch pine (Pinus sylvestris). Bark used to some extent for tanning. Grows in open groves. Radial Section, life size. Cross- section, magnified 37^ diameters. Tangential Section, life size. 66 WOOD AND FOREST. 5 WESTERN YELLOW PINE. BULL PINE. Bull refers to great size of trunk. Pinus ponderosa Lawson. Pinus, the classical Latin name; ponderosa refers to great size of trunk. Habitat. Leaf. Habitat: (See map); best in Rocky Mountains. Characteristics of the Tree: Height, 100' to 300'; diameter, 6' to even 12'; branches, low, short trunk; bark, thick, dark brown, deep, meandering furrows, large, irregular plates, scaly; leaves, in twos or threes, 5" to 11" long, cones" to 6" long. Appearance of Wood: Color, light red, sap-wood, thick, nearly white, and very distinct; non-porous; rings, conspicuous; grain, straight; rays, numerous, obscure; very resinous but ducts small. Physical Qualities : Weight, light (44th in this list), 25-30 Ibs. per cu. ft, sp. gr. 0.4715; strength, medium (45th SPECIES OF WOODS. 67 in this list) ; elasticity, medium (41st in this list) ; hardness, medium (42nd in this list) ; shrinkage, 4 per cent. ; warps ; not durable ; hard to work, brittle ; splits easily in nailing. Common Uses: Lumber, railway ties, mine timbers. Remarks: Forms extensive open for- ests. Radial Section, life size. Cross-section, magnified 37 H diameters. Tangential Section, life size. 68 WOOD AND FOREST. G LONG-LEAF PINE. GEORGIA PINE. Pinus palustris Miller. Pinus, the classical Latin name; palustris means swampy, inappro- priate here. 71 Habitat. Leaf. Habitat: (See map) ; best in Louisiana and East Texas. Characteristics of the Tree: Height, 80'-100'; diameter, 2'-3' ; trunk, straight, clean, branches high; bark, light brown, large, thin, irregular pa- pery scales; leaves 8"-12" long, 3 in a sheath ; cones 6"-10" long. Appearance of Wood: Heart-wood, spring wood light yellow, summer wood, red brown; sap wood, lighter ; non-por- ous; rings, very plain and strongly marked ; grain, straight; rays, numerous, conspicuous ; very resin- ous, but resin ducts few and not large. Physical Qualities : Heavy (18th in this list), 38 Ibs. per cu. ft., sp. gr. SPECIES OF WOODS. 69 0.6999; very strong (7th in this list); very elastic (4th in this list) ; hardness, medium (33d in this list) ; shrinkage, 4 per cent; warps very little; quite durable; works hard, tough; splits badly in nailing. Common Uses: Joists, beams, bridge and building trusses, interior finish, ship building, and general construction work. Remarks: Almost exclusively the source of turpentine, tar, pitch and resin in the United States. Known in the English market as pitch pine. Radial Section, life size. Cross-section, magnified 37^ diameters. Tangential Section, life size. Habitat. 70 WOOD AND FOREST. 7 SHORT-LEAF PINE. YELLOW PINE. Pinus echinata Miller. J'inus, the classical Latin name; echinata, refers to spiny cones. Habitat: (See map); best in lower Mississippi basin. Characteristics of the Tree : Straight, tall trunk, sometimes 100' high ; branches high ; diameter 2'-4'; bark, pale grayish red-brown, fissures, run- ning helter-skelter, mak- ing large irregular plates, covered with small scales; leaves in twos, 3" long; cones small. Appearance of Wood: Color : heartwood, sum- mer wood, red, spring- wood, yellow ; sap-wood, lighter ; non-porous ; an- nual rings very plain, sharp contrast between spring and summer wood; grain, straight, coarse ; rays, numerous, conspicu- ous; very resinous, duct? Leaf. large and many. SPECIES OF WOODS. 71 Physical Qualities: Weight, medium (32nd in this list), 32 Ibs. per cu. ft., sp. gr., 0.6104; very strong (18th in this list) ; very elastic (8th in this list) ; soft (38th in this list) ; shrinkage, 4 percent; warps little; durable; trouble- some to work; likely to split along an- nual rings in nailing. Common Uses: Heavy construction, railroad ties, house trim, ship building, cars, docks, bridges. Remarks: Wood hardly distinguish- able from long-leaf pine. Often forms pure forests. The most desirable yellow pine, much less resinous and more easily worked than others. Radial Section, life size. Cross-section, magnified 37^2 diameters. Tangential Section, life size. WOOD AND FOREST. 8 LOBLOLLY PINE. OLD FIELD PINE. Loblolly may refer to the inferiority of the wood; old field refers to habit of spontaneous growth on old fields. Pinus iaeda Linnaeus. Pinus, the classical Latin name; taeda, the classical Latin name for pitch-pine, which was used for torches. Habitat. Leaf. Habitat: (See map); grows best in eastern Vir- ginia, and eastern North Carolina. Characteristics of the Tree: Height, 100'-150'; diameter, often 4'-5' ; branches high ; bark, purplish brown, shallow, meandering fissures, broad, flat, scaly ridges; leaves, 3 in sheath, 4"-7" long; cones 3"-5" long. Appearance of Wood: Color, heart-wood orange, sap-wood lighter ; non- porous; rings very plain, sharp contrast between spring wood and summer wood ; grain, straight, coarse ; rays conspicuous ; very resinous, but ducts few and small. Physical Qualities : Weight, medium (39th in SPECIES OF WOODS. 73 this list), 33 Ibs. per cu. ft., sp. gr. 0.5441; strong (26th in this list) ; elas- tic (17th in this list) ; medium hard (43d in this list) ; shrinkage, 4 per cent; warps little; not durable; diffi- cult to work, brittle; splits along rings in nailing. Common Uses: Heavy construction, beams, ship building, docks, bridges, flooring, house trim. Remarks: Eesembles Long-leaf Pine, and often sold as such. Rarely makes pure forests. Radial Section, life size. Cross- section, magnified 37^ diameters. Tangential Section, life size. 74 AVOOD AND FOREST. 9 SLASH PINE. CUBAN PINE. Pinus caribaea Morelet. Pinus heterophylla (Ell.) Sudworth. Pinus, the classical Latin name; caribaea, refers to the Caribbean Is- lands; heterophylla refers to two kinds of leaves. Habitat. Leaf. Habitat: (See map) ; grows best in Alabama, Mississippi, and Louisi- ana, Characteristics of the Tree : Height, sometimes 110', straight, tall, branch- ing high; diameter l'-3'; bark, dark red and brown, shallow irregular fissures; leaves, 2 or 3 in a sheath, 8" -12" long; cones, 4"-5" long. Appearance of Wood: Color, dark orange, sap- wood lighter ; non-por- ous; annual rings, plain, sharp contrast between spring wood and summer wood ; grain, straight ; rays numerous, rather prominent; very resinous, but ducts few. Physical dualities : Heavy (7th in this list), SPECIES OF WOODS. 75 39 Ibs. per en. ft., sp. gr. 0.7504; very strong (6th in this list) ; very elastic (3d in this list) ; hard (24th in this list); shrinkage, 4 per cent; warps lit- tle ; quite durable ; troublesome to work ; splits along annual rings in nailing. Common Uses: Heavy construction, ship building, railroad ties, docks, bridges, house trim. Remarks: Similar to and often sold as Long-leaf Pine. Radial Section, life size. Cross-section, magnified 37^2 diameters. Tangential Section, life size. 76 \VOOD AND FOREST. 10 TAMARACK. LARCH. HACKMATACK. Larix laricina (Du Eoi) Koch. Larix americana Michaux. Larix, the classical Latin name. Habitat. Leaf. Habitat: (See map) ; prefers swamps, "Tama- rack swamps." Characteristics of the Tree: Height, 50'-60' and even 90', diameter 1'- 3'; intolerant; tall, slen- der trunk; bark, cinna- mon brown, no ridges, breaking into flakes ; leaves, deciduous, pea- green, in tufts; cone, J^"- 34", bright brown. Appearance of Wood: Color, light brown, sap- wood hardly distinguish- able ; non-porous ; rings, summer wood, thin but distinct, dark colored ; grain, straight, coarse ; rays, numerous, hardly distinguishable; very res- inous, but ducts few and small. Physical dualities : Weight, medium (29th in SPECIES OF WOODS. 77 this list), 39 Ibs. per cu. ft., sp. gr. 0.6236; strong (24th in this list) ; elas- tic (llth in this list); medium hard (40th in this list) ; shrinkage, 3 per cent ; warps ; very durable ; easy to work; splits easily. Common Uses: Ship building, elec- tric wire poles, and railroad ties; used for boat ribs because of its naturally crooked knees ; slenderness prevents com- mon use as lumber. Remarks: Tree desolate looking in winter. Radial Sectio. life size. Cross-section, magnified Z7 l /2 diameters. Tangential Section, life size. 78 WOOD AND FOREST. 11 WESTERN LARCH. TAMARACK. Larix occidentalis Nuttall. Larix, the classical L/atin name; occidentalis means western. Habitat: (See map); best in northern Montana and Idaho, on high eleva- tions. Characteristics of the Tree: Height, 90'-130', even 250'; diameter 6'-8'; Habitat. tall, slender, naked trunk, with branches high; bark, cinnamon red or purplish, often 12" thick, breaking into irregular plates, often 2' long; leaves, in tufts; deciduous; cones small. Appearance of Wood: Color, light red, thin, whitish, sap-wood ; non- porous ; grain, straight, fine ; rays numerous, thin ; very resinous, but ducts small and obscure. Physical Qualities : Weight, heavy (llth in this list), 46 Ibs. per cu. Leaf. ft., sp. gr. 0.7407; very SPECIES OF WOODS. 79 strong (3d in this list) ; very elastic (1st in this list); medium hard (35th in this list); shrinkage, 4 per cent; warps ; very durable ; rather hard to work, takes fine polish; splits with difficulty. Common Uses: Posts, railroad ties, fencing, cabinet material and fuel. Remarks: A valuable tree in the Northwest. Radial Section, life size. Cross-section, magnified 37^ diameters. Tangential Section, life size. 80 WOOD AND FOREST. 12 WHITE SPRUCE. Picca canadensis (Miller) B. S. P. Picca alba Link. Picea, the classical Latin name ; white and alba refers to the p of the leaves, especially when young, and to the whitish bark. le color Habitat. Leaf. Habitat: (See map) . Characteristics of the Tree : Height, 60'-100' and even 150'; diameter, l'-2' and even 4'; long, thick branches ; bark, light grayish brown, sep- arating into thin plate-like scales, rather smooth ap- pearance, resin from cuts forms white -gum ; leaves, set thickly on all sides of branch, finer than red spruce, odor disagreeable; cones, 2" long, cylindrical, slender, fall during sec- ond summer. Appearance of Wood: Color,, light yellow, sap- wood, hardly distinguish- able ; non-porous ; rings, wide, summer wood thin, not conspicuous ; grain, straight; rays, numerous, prominent; resin ducts , few and minute. SPECIES OF WOODS. 81 Physical Qualities: Weight, light (51st in this list) ; 25 Ibs. per cu. ft., sp. gr., 0.4051 ; medium strong (42d in this list) ; elastic (29th in this list) ; soft (58th in this list) ; shrinks 3 per cent; warps ; fairly durable ; easy to work, satiny surface; splits readily. Common Uses: Lumber and paper pulp; (not distinguished from Red and Black Spruce in market). Remarks : Wood very resonant, hence used for sounding boards. The most im- portant lumber tree of the sub-arctic forest of British Columbia. Radial Section, life size. Cross-section, magnified ZT 1 A diameters. Tangential Sectiot life size. 82 WOOD AND FOREST. 13 RED SPRUCE.* Picea rubens Sargent. Picea, the classical Latin name for the pitch pine; rubens refers to red- dish bark, and perhaps to the reddish streaks in the wood. Habitat. Leaf. Habitat: (See map) ; stunted in north. Characteristics of the Tree : Height, 70'-SO', even 100'; diameter, 2'-3', grows slowly ; trunk, straight, columnar, branches in whorls, cleans well in forest; bark, red- dish brown with thin ir- regular scales ; leaves, needle-shaped, four-sided, pointing everywhere ; cones, lj4"-2" long, pen- dent, fall during the first winter. Appearance of Wood: Color, dull white with oc- casional reddish streaks ; sap-wood not distinct ; non-porous ; rings, sum- mer rings thin, but clearly defined ; grain, straight ; rays, faintly discernible ; resin ducts, few and small. *No; distinguished in the Jesup collection from Picea nigra. SPECIES OF WOODS. 83 Physical Qualities: Weight, light (47th in this list) ; 28 Ibs. per cu. ft., sp. gr., 0.4584; medium strong (41st in this list) ; elastic (21st in this list) ; soft (54th in this list) ; shrinkage, 3 per cent ; warps little ; not durable ; easy to plane, tolerably easy to saw, hard to chisel neatly; splits easily in nailing. Common Uses: Sounding boards, construction., paper pulp, ladders. Remarks: The exudations from this species are used as chewing gum. Bark of twigs is used in the domestic manu- facture of beer. The use of the wood for sounding boards is due to its resonance, and for ladders to its strength and Radial Section, life size. Cross-section, magnified 37^2 diameters. Tangential Section, life size. 84 WOOD AND FOREST. 14 BLACK SPRUCE.* Picea mariana (Miller) B. S. P. Picea nigra Link. Picea, the classical Latin name for the pitch pine; mariana named for Queen Mary; black and nigra refer to dark foliage. Habitat. Leaf. Habitat: (See map) ; best in Canada. Characteristics of the Tree : Height, 50'-80' and even 100'; diameter, 6"-!' even 2'; branches, whorled, pendulous with upward curve ; bark, gray, loosely attached flakes; leaves, pale blue- green, spirally set, point- ing in all directions; cones, small, ovate-ob- long, persistent for many years. Appearance of Wood: Color, pale, reddish, sap- wood, thin, white, not very distinct ; non-por- ous; rings, summer wood, small thin cells; grain, straight; rays, few, con- spicuous; resin ducts, few and minute. Physical Qualities : Weight, light (47th in *Not distinguished in Jesup Collection from Picea rubens. SPECIES OF WOODS. 85 this list), 33 Ibs. per cu. ft., sp. gr., 0.4584; medium strong (41st in this list) ; elastic (21st in this list) ; soft (54th in this list) ; shrinkage, 3 per cent; warps little; not durable; easy to work; splits easily in nailing. Common Uses: Sounding board?, lumber in Manitoba. Remarks: Not distinguished from Red Spruce commercially. Radial Section, life size. Cross-section, magnified 37 H diameters. Tangential Section, life size. 86 WOOD AND FOREST. 15 WHITE SPRUCE. ENGEI/MANN'S SPRUCE. Picea engelmanni (Parry) Engelmann. Named for George Engelmann, an American botanist Habitat. Leaf. Habitat: (See map) ; grows at very high eleva- tions, forming forest at 8,000'-10,000'; best in British Columbia. Characteristics of the Tree: Height, 75'-100', even 150'; diameter, 2'-3', even 5'; branches whorled, spreading ; bark, deeply furrowed, red-brown to purplish brown, thin, large, loose scales; leaves, blue-green, point in all directions ; cones, 2" long, oblong, cylindrical. Appearance of Wood: Color, pale yellow or red- dish, sap-wood hardly dis- tinguishable ; non-porous ; rings, very fine, summer wood, narrow, not con- spicuous; grain, straight, close ; rays, numerous, conspicuous ; resin ducts, small and few. SPECIES OF WOODS. 87 Physical Qualities: Weight, very light (57th in this list) ; 22 Ibs. per cu. ft., sp. gr. 0.3449; weak (61st in this list) ; elasticity medium (55th in this list); soft (56th in this list); shrinkage, 3 per cent. ; warps ; durable; easy to work; splits easily. Common Uses: Lumber. Remarks: A valuable lumber tree in the Rocky Mountains and the Cas- cades. Bark used for tanning. Radial Section, life size. Cross-section, magnified 37^ diameters. Tangential Section, life size. 88 WOOD AND FOREST. 16 TlDELAND SPRUCE. SlTKA SPRUCE. Picea sitchensis (Bongard) Carriere. Picea, the classical Latin name for the pitch pine. Tideland refers to its habit of growth along the sea coast; sitchensis, named for Sitka. Leaf. Habitat: (See map); best on Pacific slope of British Columbia and northwestern United States. Characteristics of the Tree: Height, 100'-150' and even 200' high; di- ameter 3'-4' and even 15'; trunk base enlarged ; bark, thick, red-brown, scaly ; leaves, standing out in all directions ; cones, 2>^"-4" long, pendent, cylindrical, oval. Appearance of Wood: Color, light brown, sap- wood whitish ; non-por- ous; rings, wide, sum- mer wood, thin but very distinct, spring wood, not plain ; grain, straight, coarse ; rays, numerous, rather prominent ; resin ducts, few and small. SPECIES OF WOODS. 89 Physical Qualities: Weight, light (52d in this list) ; 27 Ibs. per cu. ft., sp. gr. 0.4287; medium strong (53d in this list) ; elastic (31st in this list) ; soft (59th in this list) ; shrinkage, 3 per cent. ; warps ; durable; easy to work; splits easily. Common Uses: Interior finish, boat building and cooperage. Remarks: Largest of the spruces. Common in the coast belt forest. Radial Section, life size. Cross-section, magnified 37^2 diameters. Tangential Section, life size. 90 WOOD AND FOREST. Habitat. HEMLOCK. Tsuga canadensis (Linnaeus) Carriere. Tsuga, the Japanese name latinized; canadensis named for Canada. Habitat: (See map) ; best in North Carolina and Tennessee. Characteristics of the Tree: Height, 60'-70', sometimes 100'; diameter, 2'-3' ; branches, persist- ent, making trunk not very clean ; bark, red-gray, narrow, rounded ridges, deeply and irregularly fissured ; leaves, spirally arranged, but appear two- ranked; cones, 34" l n g> graceful. Appearance of Wood: Color, reddish brown, sap- wood just distinguishable; non-porous; rings, rather broad, conspicuous; grain, crooked; rays, numerous, thin ; non-resinous. Physical Qualities: Weight, light (53d in this list) ; 26 Ibs. per cu. Leaf. SPECIES OF WOODS. 91 ft., sp. gr. 0.4239 ; medium strong (44th in this list) ; elasticity, medium (40th in this list); soft (51st in this list); shrinkage, 3 per cent; warps and checks badly; not durable; difficult to work, splintery, brittle; splits easily, holds nails well. Common Uses: Coarse, cheap lum- ber, as joists, rafters, plank walks and laths. Remarks: The poorest lumber. Bark chief source of tanning material. Radial Section, life siie. Cross- section, magnified 37^2 diameters. Taneential Section, life size. 92 WOOD AND FOREST. Habitat. 18 WESTERN HEMLOCK. BLACK HEMLOCK. Tsuga heterophylla (Rafinesque) Sargent. Tsuga, the Japanese name latinized; heterophylla refers to two kinds of leaves. Habitat: (See map) ; best on coast of Washing- ton and Oregon. Characteristics of the Tree: Height, 150'-200'; diameter, 6'-10'; branches, pendent, slender ; bark, reddish gray, deep, longi- tudinal fissures between, broad, oblique, flat ridges; leaves, dark green, two- ranked; cones, small, like Eastern Hemlock. Appearance of Wood: Color, pale brown, sap- wood thin, whitish; non- porous ; rings, narrow, summer wood thin but distinct ; grain, straight, close ; rays, numerous, prominent ; non-resinous. Physical dualities : Light in weight, strong, elastic, hard;* shrinkage, Leaf. *Not in Jesup Collection. SPECIES OF WOODS. 93 3 per cent. ; warps ; durable, more so than other American hemlocks; easier to work than eastern variety; splits badly. Common Uses: Lumber for construc- tion. Kemarks: Coming to be recognized as a valuable lumber tree. Radial Section, life size. Cross- section, magnified 37 l /2 diameters. Tangential Section, life size. 94 WOOD AND FOREST. Habitat. 19 DOUGLAS SPRUCE. OREGON PINE. EED FIR. DOUGLAS FIR. Pseudotsuga mucronata (Rafmesque) Sudworth. Pseudotsuga taxifolia (Lambert) Britton. Pseudotsuga means false hemlock; mucronata refers to abrupt short point of leaf; taxifolia means yew leaf. Habitat: (See map) ; best in Puget Sound re- gion. Characteristics of the Tree: Height, 175'-300'; diameter, 3'-5', sometimes 10'; branches high, leav- ing clean trunk; bark, rough, gray, great broad- rounded ridges, often ap- pears braided ; leaves, radi- ating from stem; cones, 2"-4" long. Appearance of Wood: Color, light red to yellow, sap-wood white; non-por- ous; rings, dark colored, conspicuous, very pro- nounced summer wood ; grain, straight, coarse ; rays, numerous, obscure ; resinous. Physical Qualities : Weight, medium (41st in this list) ; 32 Ibs. per cu. Leaf. SPECIES OP WOODS. 95 ft., sp. gr. 0.5157; strong (21st in this list) ; very elastic (10th in this list) ; medium hard (45th in this list) ; shrink- age, 3 per cent, or 4 per cent. ; warps ; durable ; difficult to work, flinty, splits readily. Common Uses: Heavy construction, masts, flag poles, piles, railway ties. Remarks: One of the greatest and the most valuable of the western timber trees. Forms extensive forests. Radial Section, Hfe size. Cross-section, magnified 37^ diameters. Tangential Section, life size. WOOD AND FOREST. 20 GRAND FIR. WHITE FIR. LOWLAND FIR. SILVER FIR. Abies grandis Lindley. Abies, the classical Latin name. Habitat. Leaf. Habitat: (See map) ; best in Puget Sound re- gion. Characteristics of the Tree: Height, in interior 100'; diameter, 2'; on coast, 250'-300' high; di- ameter, 2'-5'; long pend- ulous branches ; bark, quite gray or gray brown, shallow fissures, flat ridges ; leaves, shiny green above, silvery be- low, l^"-2" long, roughly two-ranked; cones, cylin- drical, 2"-4" long. Appearance of Wood: Color, light brown, sap- wood lighter ; non-porous ; rings, summer cells broader than in other American species, dark colored, conspicuous ; grain straight, coarse; rays, nu- merous, obscure; resinous. SPECIES OF WOODS. 97 Physical Qualities: Very light (62d in this list) ; 22 Ibs. per cu. ft., sp. gr., 0.3545; weak (62d in this list); elas- tic (34th in this list) ; soft (65th in this list) ; shrinkage, 3 per cent ; warps little; not durable; works easily; splits readily. Common Uses: Lumber and packing cases. Remarks: No resin ducts. Not a verv valuable wood. Radial Section, life size. Cross-section, magnified 37^ diameters. Tangential Section, life size. 96 WOOD AND FOREST. Habitat. 21 BIG TREE. SEQUOIA. GIANT SEQUOIA. Sequoia washing 'oniana (Winslow) Sudworth. Sequoia gigantea, Decaisne-. Sequoia latinized from Sequoiah, a Cherokee Indian; ivashingtoniana, in honor of George Washington. Habitat: (See map) ; in ten groves in southern California, at high eleva- tion. Characteristics of the Tree: Height, 275', sometimes 320' ; diame- ter, 20', sometimes 35'; trunk, swollen and often buttressed at base, ridged, often clear for 150'; thick horizontal branches; bark, l'-2' thick, in great ridges, separates into loose, fibrous, cinnamon red scales, almost non-com- bustible ; leaves, very small, growing close to stem; cones, 2"-3" long. Appearance of Wood: Color, red, turning dark on exposure, sap-wood thin, whitish ; non-por- ous; rings, very plain; grain straight, coarse ; rays, numerous, thin ; non-resinous. Leaf. SPECIES OF WOODS. 99 Physical Qualities: Light (65th in this list); 18 Ibs. per cu. ft; sp. gr., 0.2882; weak (63d in this list); brit- tle (62d in this list) ; very soft (61st in this list); shrinks little; warps lit- tle; remarkably durable; easy to work, splits readily, takes nails well. Common Uses: Construction, lum- ber, coffins, shingles. Remarks: Dimensions and age are unequalled; Big Tree and Redwood survivors of a prehistoric genus, once widely distributed. Some specimens 3600 years old. Radial b^ction, life size. Cross-section, magnified 37 H diameters. Tangential Section, life size. 100 WOOD AND FOREST. Habitat. 22 KEDWOOD. COAST EEDWOOD. SEQUOIA. Sequoia sempervirens (Lambert) Endlicher. Sequoia, latinized from Sequoiah, a Cherokee Indian; sempervirens means ever living. Habitat: (See map) ; best in southern Oregon and northern California, near coast. Characteristics of the Tree: Height, 200'-340'; diameter, 10'- 15', rarely 25'; clean trunk, much buttressed and swollen at base, somewhat fluted, branches very high; bark, very thick, 6"-12", round- ed ridges, dark scales falling reveal inner red bark; leaves, small, two- ranked; cones, small, 1" long. Appearance of Wood: Color, red, turning to brown on seasoning, sap- wood whitish ; non-por- ous ; rings, distinct ; grain, straight; rays, nu- merous, very obscure ; non- resinous. Leaf. SPECIES OF WOODS. 101 Physical Qualities: Light in weight (55th in this list) ; 26 Ibs. per en. ft., sp. gr. 0.4208; weak (58th in this list) ; brittle (60th in this list) ; soft (55th m this list); shrinks little; warps lit- tle; very durable; easily worked; splits readily; takes nails well. Common Uses: Shingles, construc- tion, timber, fence posts, coffins, rail- way ties, water pipes, curly specimens used in cabinet work. "Remarks: Low branches rare. Burns with difficulty. Chief construction wood of Pacific Coast. Use determined largely by durability. Radial Section, life size. Cross-section, magnified 37^ diameters. Tangential Section, life size. 102 WOOD AND FOREST. Habitat. 23 BALD CYPRESS. Bald refers to leaflessness of tree in winter. Taxodium distichum (Linnaeus) L. C. Richard. Taxodium means yew-like; distichum refers to the two-ranked leaves. Habitat: (See map) ; best in South Atlantic and Gulf States. Characteristics of the Tree: Height, 75', oc- casionally 150'; diame- ter, 4'-5'; roots project upward into peculiar knees ; trunk strongly buttressed at base, straight, majestic and tapering; bark, light red, shallow fissures, flat plates^ peeling into fibrous strips ; leaves, long, thin, two-ranked, deciduous ; cones, nearly globular, 1" in diameter. Appearance of Wood: Color, heart-wood, red- dish brown, sap-wood, nearly white ; non-por- ous; rings, fine and well marked ; grain, nearly straight, burl is beauti- fully figured; rays, very Leaf. obscure ; non-resinous. SPECIES OF WOODS. 103 Physical Qualities: Light in weight (48th in this list) ; 29 Ibs. per cu. ft., sp. gr. 0.4543; medium strong (48th in this list) ; elastic (28th in this list) ; soft (52d in this list) ; shrinkage, 3 per cent. ; warps but little, likely to check; very durable; easy to work, in splitting,, crumbles or breaks; nails well. Common Uses: Shingles, posts, in- terior finish, cooperage, railroad ties, boats, and various construction work, especially conservatories. Remarks : Forms forests in swamps ; subject to a fungous disease, making wood "peggy" or "pecky"; use largely determined by its durability. In New Orleans 90,000 fresh water cisterns are said to be made of it. Radial Section, life size. Cross-section, magnified 37 H diameters. Tangential Section, life size. 104 WOOD AND FOREST. Habitat. 24 WESTERN EED CEDAR. CANOE CEDAR. GIANT ARBORVITAE. Thuja plicata D. Don. Thuya gigantea Nuttall. Thuya or Thuja, the classical Greek name; plicata refers to the folded leaves; gigantea refers to the gigantic size of the tree. Habitat: (See map); best in Puget Sound re gion. Characteristics of the Tree: Height, 100'-200'> diameter, 2'-10', even 15' ; trunk has immense but- tresses, often 16' in di- ameter, then tapers \ branches, horizontal } short, making a dense conical tree; bark, bright cinnamon red, shallow fissures, broad ridges, peeling into long, nar- row, stringy scales , leaves, very small, over- lapping in 4 ranks, on older twigs, sharper and more remote; cones, ^" long, small, erect. Appearance of Wood: Color, dull brown or red. thin sap-wood nearly white ; non-porous ; rings, Leaf. SPECIES OF WOODS. 105 summer bands thin, dark colored, dis- tinct; grain, straight, rather coarse; rays, numerous, obscure; non-resinous. Physical Qualities: Very light in weight (60th in this list) ; medium strong (40th in this list) ; elastic (26th in this list); soft (60th in this list); shrinkage, 3 per cent. ; warps and checks little; very durable; easy to work; splits easily. Common Uses: Interior finish, cabi- net making, cooperage, shingles, electric wire poles. Remarks: Wood used by Indians for war canoes, totems and planks for lodges; inner bark used for ropes and textiles. Radial Section, life size. Cross-section, magnified 37^ diameters. Tangential Section, life size. Habitat. 106 WOOD AND FOREST. 25 WHITE CEDAR. Chamaecyparis thyoides (Linnaeus) B. S. P. Chamaecyparis means low cypress; thyoides means like thuya (A&or- vitae). Habitat: (See map); best in Virginia and North Carolina. Characteristics of the Tree : Height, 60'-80' ; diameter, 2'-4'; branches, low, often forming im- penetrable thickets; bark, light reddish brown, many fine longitudinal fissures, often spirally twisted around stem ; leaves, scale-like, four- ranked ; cones, globular, Y^" diameter. Appearance of Wood: Color, pink to brown, sap-wood lighter ; non- porous; rings, sharp and distinct; grain, straight; rays, numerous, obscure; non-resinous. Physical Qualities : Very light in weight (64th in. this list); 2?> SPECIES OF WOODS. 107 Ibs. per cu. ft., sp. gr. 0.3322) ; weak (64th in this list) ; brittle (63d in this list; soft (62d in this list); shrinkage 3 per cent. ; warps little ; extremely dur- able; easily worked; splits easily; nails well. Common Uses : Boats, shingles, posts, railway ties, cooperage. Remarks: Grows chiefly in swamps, often in dense pure forests. Uses deter- mined largely by its durability. Radial Section, life size. Cross-section, magnified 37^ diameters. Tangential Section, life size. 108 WOOD AND FOREST, 26 LAWSON CYPRESS. PORT ORFORD CEDAR. OREGON CEDAR. WHITE CEDAR. Chamaecyparis lawsoniana (A. Murray) Parlatore. Chamaecyparis means low cypress. "F"-- ToJ Habitat. Leaf. Habitat: (See map); best on coast of Oregon. Characteristics of the Tree: Height, 100'-200'; diameter, 4'-8'j even 12'; base of trunk abruptly enlarged ; bark, very thick, even 10" at base of trunk, inner and outer layers distinct, very deep fissures, rounded ridges; leaves, very small, 1/16" long, four-ranked, over- lapped, flat sprays ; cones, small, J4", globular. Appearance of Wood: Color, pinkish brown, sap-wood hardly distin- guishable ; non-porous ; rings., summer wood thin, not conspicuous ; grain, straight, close; rays, nu- merous, very obscure ; non-resinous. Physical Qualities : Light in weight (46th in SPECIES OF WOODS. 109 this list) ; 28 Ibs. per cu. ft., pp. gr. 0.4621; strong (25th in this list) ; elas- tic (12th in this list); soft (50th in this list) ; shrinkage 3 or 4 per cent. ; warps little; durable; easily worked; splits easily. Common Uses: Matches (almost ex- clusively on the Pacific Coast), interior finish, ship and boat building. Remarks: Resin, a powerful diuretic and insecticide. Radial Section, life size. Cross-section, magnified 37^ diameters. Tangential Section, life size. Habitat. 110 WOOD AND FOREST. 27 RED CEDAR. Juniperus virginiana Linnaeus. Juniperus, the classical Latin name; virginiana, in honor of the State of Virginia. Habitat: (See map); best in Gulf States in swamps, especially on the west coast of Florida. Characteristics of the Tree: Height, 40'-50', even 80' ; diameter, l'-2' ; trunk, ridged, sometimes expanded ; branches, low ; bark, light brown,, loose, ragged, separating into long, narrow, persistent, stringy scales; leaves, op- posite, of two kinds, awl- shaped, and scale-shaped ; fruit, dark blue berry. Appearance of Wood: Color, dull red, sap-wood white ; non-porous ; rings, easily distinguished ; grain, straight; rays, nu- merous, very obscure ; non-resinous. Physical Qualities : Leaf. Very light in weight SPECIES OF WOODS. Ill (42d in this list) ; 30 Ibs. per cu. ft., sp. gr. 0.4826; medium strong (43d in this list) ; brittle (61st in this list) ; medium hard (34th in this list) ; shrink- age, 3 per cent.; warps little; very dur- able; easy to work; splits readily, takes nails well. Common Uses: Pencils, chests, cigar boxes, pails, interior finish. Remarks: Fragrant. Pencils are made almost exclusively of this wood, because it is light, strong, stiff, straight and fine-grained and easily whittled ; supply being rapidly depleted. Radial Section, life size. Cross-section, magnified 37 y 2 diameters. Tangential Section, life size. 112 Habitat. WOOD AND FOREST. 28 BLACK WILLOW. Salix nigra Marshall. Salix, from two Celtic words meaning near-water; nigra refers to the dark bark. Habitat: (See map); grows largest in southern Illinois, Indiana and Texas, on moist banks. Characteristics of the Tree: Height, 30'-40', sometimes 120' ; diame- ter, l'-2', rarely 3'-4'; stout, upright, spreading branches, from common base; bark, rough and dark brown or black, of- ten tinged with yellow or brown ; leaves, lanceo- late, often scythe-shaped, serrate edges; fruit, a capsule containing small, hairy seeds. Appearance of Wood: Color, light reddish brown, sap-wood, thin, whitish ; diffuse-porous ; rings, obscure ; grain, close and weak; rays, obscure. I Leaf. SPECIES OF WOODS. 113 Physical Qualities: Light in weight (51st in this list) ; 27.77 Ibs. per cu. ft., sp. gr. 0.4456; weak (65th in this list) ; very brittle (64th in this list) ; soft (46th in this list) ; shrinks consider- ably ; warps and checks badly ; soft, weak, indents without breaking; splits easily. Common Uses: Lap-boards, baskets, water wheels, fuel and charcoal for gun- powder. Remarks: Its characteristic of in- denting without breaking has given it use as lining for carts and as cricket bats. Of the many willows, the most tree like in proportion in eastern Nortli America. Bark contains salvcvlic acid. Radial Section, life size. Cross-section, magnified 37^ diameters. langential Section, life size. 114 WOOD AND FOREST. 29 BUTTERNUT. WHITE WALNUT. Butternut, because the nuts are rich in oil. Juglans cinerea Linnaeus. Juglans means Jove's nut; cinerea refers to ash-colored bark. Habitat. Leaf. Habitat: (See map) ; best in Ohio basin. Characteristics of the Tree: Height, 75'-100': diameter, 2'-4'; branches low, broad spreading deep roots; bark, gray ish brown, deep fissures, broad ridges ; leaves. 15"-30" long, compound. 11 to 17 leaflets, hairj and rough; fruit, ob long, pointed, edible, oilj nut. Appearance of Wood; Color, light brown, dark- ening with exposure, sap wood whitish ; diffuse porous; rings, not prom inent ; grain, f airl} straight, coarse, takes high polish; rays, dis tinct, thin, obscure. Physical Qualities ; Light in weight (56th in SPECIES OF WOODS. 115 this list), 25 Ibs. per cu. ft., sp. gr. 0.4086; weak (57th in this list); elas- ticity, medium (52d in this list) ; soft (47th in this list) ; shrinkage per cent.; warps little; durable; easy to work; splits easily. Common Uses: Cabinet work, inside trim. Kemarks : Green husks of fruit give yellow dye. Sugar made from sap. Radial Section, life size. Cross-section, magnified 37 % diameters. Tangential Section, life size. 116 WOOD AND FOREST. 30 BLACK WALNUT. Juglans nigra Linnaeus. Juglans means Jove's nut; nigra refers to the dark wood. Habitat. Leaf. Habitat: (See map); best in western North Carolina and Tennessee. Characteristics of the Tree: Height, 90'-120', even 150'; diameter, 3' to even 8'; clean of branches for 50' to 60'; bark, brownish, almost black, deep fissures, and broad, rounded ridges ; leaves, l'-2' long, com- pound pinnate, 15 to 23 leaflets, fall early; fruit, nut, with adherent husk, and edible kernel. Appearance of Wood : Color, chocolate brown, sap-wood much lighter ; diffuse-porous ; rings, marked by slightly larger pores; grain, straight; rays, numerous, thin, not conspicuous. Physical dualities : Weight, medium (31st SPECIES OF WOODS. 117 in this list) ; 38 Ibs. per cu. ft., sp. gr. 0.6115; strong (32d in this list); clas- tic (23d in this list) ; hard (21st in this list) ; shrinkage, 5 per cent.; warps little; very durable; easy to work; splits with some difficulty, takes and holds nails well. Common Uses: Gun stocks (since 17th century), veneers, cabinet making. Remarks: Formerly much used for furniture, now scarce. Plentiful in Cal- ifornia. Most valuable wood of North American forests. Wood superior to European variety. Kadial Section, life size. Cross-section, magnified 37^ diameters. Tangential Section, life size. 118 WOOD AND FOREST. Habitat. 31 MOCKERNUT. BLACK HICKORY. BULL-NUT. BIG-BUD HICKORY. WHITE-HEART HICKORY. KING NUT. Mockernut refers to disappointing character of nuts. Hicoria alba (Linnaeus) Britton. Carya tomentosa Nuttall. Hicoria, shortened and latinized from Pawcohicora, the Indian name for the liquor obtained from the kernels; alia refers to the white wood, oarya, the Greek name for walnut; tomentosa refers to hairy under surface of leaf. Habitat: (See map); best in lower Ohio val- ley, Missouri and Ar- kansas. Characteristics of the Tree: Height, 75'. rarely 100' ; diameter. 2'-3'; rises high in for- est; bark, dark gray, shallow, irregular inter- rupted fissures, rough but not shaggy in old trees ; leaves, 8"-12" long, compound, 7-9 leaflets, fragrant when crushed: fruit, spherical nut, thick shell, edible kernel. Appearance of Wood: Color, dark brown, sap- wood nearly white; ring- porous; rings, marked by few large regularly dis- tributed open ducts ; grain, usually straight, close ; rays, numerous, thin, obscure. Leaf. SPECIES OF WOODS. 119 Physical Qualities: Very heavy (3d in this list) ; 53 Ibs. per cu. ft., sp. gr., 0.8218; very strong (llth in this list) ; very elastic (14th in this list) ; very hard (3d in this list) ; shrinkage, 10 per cent. ; warps ; not dur- able; very hard to work; splits with great difficulty, almost impossible to nail. Common Uses: Wheels, runners, tool and axe handles, agricultural imple- ments. Remarks: Confounded commercially with shellbark hickory. Radial Section, life size. Cross-section, magnified 37^ diameters. Tangential Section, Hfe size. 120 WOOD AND FOREST. 32 SHELLBARK HICKORY. S.HAGBARK HICKORY. Hicoria ovata (Millar) Britton. Carya alba Nuttall. Hickory is shortened and latinized from Pawcohicora, the Indian name for the liquor obtained from the kernels; ovata refers to oval nut; carya, the Greek name for walnut. Habitat. Leaf. Habitat: (See map) ; best in lower Ohio val- ley. Characteristics of the Tree: Height, 70'-90' and even 120'; diameter, 2'-3', even 4'; straight, columnar trunk ; bark, dark gray, separates into long, hard, plate-like strips, which cling to tree by middle, on young trees very smooth and close ; leaves, 8"-20" long, compound 5 or (7) leaflets; nuts, glo- bular, husk, four-valved, split easily, thin-shelled, edible. Appearance of Wood : Color, reddish brown, sap-wood whitish; ring- porous ; rings, clearly marked; grain, straight; rays, numerous, thin. SPECIES OP WOODS. 121 Physical Qualities: Very heavy (1st in this list) ; 51 Ibs. per cu. ft.; sp. gr., 0.8372; very strong (5th in this list); very elastic (7th in this list) ; very hard (5th in this list) ; shrinkage, 10 per cent.; warps badly; not very durable under exposure; hard to work, very tough; hard to split, very difficult to nail. Common Uses: Agricultural imple- ments, handles, wheel spokes. Remarks: American hickory is fa- mous both for buggies and ax handles, because it is flexible and very tough in resistance to blows. Radial Section, life size. Cross-section, magnified 37^ diameters. Tangential Section, life size. 122 WOOD AND FOREST. PIGNUT. Nuts eaten by swine. Habitat. Hicoria glabra (Miller) Britton. Carya porcina. Hicoria is shortened and latinized from Pawcohicora, the Indian name for the liquor obtained from the kernel; glabra refers to smooth bark; Carya the Greek name for walnut; porcina means pertaining to hogs. Habitat: (See map) ; best in lower Ohio val- ley. Characteristics of the Tree: Height, 80'-100'; diameter 2'-4'; trunk of- ten forked; bark, lighi gray, shallow fissures, rather smooth, rarely ex- foliates ; leaves, 8"-12" long, compound 7 leaflets, sharply serrate; fruit, a thick-shelled nut, bitter kernel. Appearance of Wood: Color, light or dark brown, the thick sap-wood lighter, often nearly white; ring-porous; rings, marked . by many large open ducts ; grain, straight; rays, small and insignificant. Physical Qualities : Very heavy (4th in this Leaf. SPECIES OF WOODS. 123 list) ; 56 Ibs. per cu. ft.; sp. gr., 0.8217; very strong (15th in this list) ; elastic (27th in this list) ; very hard (2d in this list) ; shrinkage, 10 per cent. ; warps ; hard to work ; splits with difficulty, hard to drive nails into. Common Uses: Agricultural imple- ments,, wheels, runners, tool handles. Remarks: Wood not distinguished from shellbark hickory in commerce. Radial Section, life size. Cross-section, magnified z7 l /2 diameters. Tangential Section, life size. 124 WOOD AND FOREST. 34 BLUE BEECH. HORNBEAM. WATER BEECH. IRON-V/OOD. Blue refers to color of bark; the trunk resembles beech; horn refers to horny texture of wood. Carpinus caroliniana Walter. Carpinus, classical Latin name; caroliniana, named from the state. Habitat. Leaf. Habitat : ( See map ) ; best on western slopes of Southern Allegheny Mountains and in south- ern Arkansas and Texas. Characteristics of the Tree: Height, a small tree, 30'-50' high ; diam- eter, 6"-2'; short, fluted, sinewy trunk ; bark, smooth, bluish gray ; leaves, falcate, doubly serrate; fruit, small oval nut, enclosed in leaf-like bract. Appearance of Wood: Color, light brown, sap- wood thick, whitish; dif- fuse-porous ; rings, ob- scure; grain, close; rays, numerous, broad. Physical Qualities : Heavy (13th in this list) ; 45 Ibs. per cu. ft., sp. gr. 0.7286; very SPECIES OP WOODS. 125 strong (9th in this list) ; very stiff (15th in this list) ; hard (14th in this list) ; shrinkage, 6 per cent. ; warps and checks badly ; not durable ; hard to work ; splits with great difficulty. Common Uses: Levers, tool handles. Remarks: No other wood so good for levers, because of stiffness. Radial Section, life size. Cross-section, magnified 37^ diameters. Tangential Section, life size. 126 WOOD AND FOREST. 35 CANOE BIRCH. WHITE BIRCH. PAPER BIRCH. All names refer to bark. Betula papyrifera Marshall. Betula, the classical Latin name; papyrifera refers to paper bearing bark. Habitat. Leaf. Habitat: (See map); best west of Rocky Moun- tains. Characteristics of the Tree: Height, 60'-80'; diameter, 2'-3' ; stem rarely quite straight ; bark, smooth, white, ex- terior marked with len- ticels, peeling freely horizontally into thin papery layers, showing brown or orange be- neath, contains oil which burns hotly, formerly used by Indians for ca- noes, very remarkable (see Keeler, page 304) ; leaves, heart-shaped, ir- regularly serrate; fruit, pendulous strobiles. Appearance of Wood: Color, brown or reddish, sap-wood white; diffuse- porous ; rings, obscure ; grain, fairly straight ; rays, numerous, obscure. SPECIES OP WOODS. 127 Physical dualities : Weight, medium (33d in this list) ; 37 Ibs. per cu. ft.; sp. gr. 0.5955; very strong (14th in this list) ; very elastic (3d in this list) ; me- dium hard (39th in this list) ; shrink- age, 6 per cent. ; warps, ; not durable, except bark ; easy to work ; splits with difficulty, nails well, tough. Common Uses : Spools, shoe lasts and pegs, turnery, bark for canoes. Remarks: Forms forests. Sap yields syrup. Bark yields starch. Valuable to woodsmen in many ways. Radial Section, life size. Cross-section, magnified 37^ diameters. Tangential Section, life size. 128 WOOD AND FOREST. 36 RED BIRCH. RIVER BIRCH. Red refers to color of bark; river, prefers river bottoms. Betula nigra Linnaeus. Betula, the classical Latin name. Habitat. Leaf. Habitat : ( See map ) ; best in Florida, Louisi- ana and Texas. Characteristics of the Tree: Height, 30'-80', and even higher; diame- ter, 1', even 5'; trunk, often divided low; bark, dark brown, marked by horizontal lenticels, peels into paper plates, curl- ing back; leaves, doubly serrate, often almost lobed ; fruit, pubescent, erect, strobiles. Appearance of Wood: Color, light brown, thick sap-wood, whitish ; dif- fuse-porous ; rings, not plain ; grain, close, rather crooked; rays, numerous, obscure. Physical Qualities : Weight, medium (36th in this list) ; 35 Ibs. per SPECIES OF WOODS. 129 cu. ft.; sp. gr. 0.5762; strong (22d in this list) ; very elastic (19th in this list) ; medium hard (37th in this list) ; shrinkage, 6 per cent. ; warps, ; not durable when exposed; hard to work, tough; splits with difficulty, nails well. Common Uses: Shoe lasts, yokes, furniture. Remarks: Prefers moist land. Kadial Section, life size. Cross-section, magnified 37^ diameters. laugtiiiiai section, life size. 130 WOOD AND FOREST. 37 CHERRY BIRCH. SWEET BIRCH. BLACK: BIRCH. MAHOGANY BIRCH. Cherry, because bark resembles that of cherry tree; sweet, refers to the taste of the spicy bark. Betula lenta Linnaeus. Betula, the classical Latin name; lenta, meaning tenacious, sticky, may refer to the gum which exudes from the trunk. Habitat. Leaf. Habitat: (See map); best in Tennessee Moun- tains. Characteristics of the Tree: Height, 50'-80'; diameter, 2'-5' ; trunk, rarely straight ; bark, dark reddish brown, on old trunks deeply fur- rowed and broken into thick, irregular plates, marked with horizontal lenticels ; resembles cherry ; spicy, aromatic ; leaves, ovate, oblong, 2"- 6" long, irregularly ser- rate; fruit, erect stro- biles. Appearance of Wood: Color, dark, reddish brown ; diffuse-porous ; rings, obscure ; grain, close, satiny, polishes well, often stained to imitate mahogany; rays, numerous, obscure. SPECIES OF WOODS. 131 Physical Qualities: Heavy (6th in this list); 47 Ibs. per cu. ft.; sp. gr., 0.7617; very strong (4th in this list); very elastic (6th in this list) ; hard (llth in this list) ; shrinkage, 6 per cent, warps, little; not durable if exposed; rather hard to work; splits hard, tough. Common Uses: Dowel pins, wooden ware, boats and ships. Remarks: The birches are not usu- ally distinguished from one another in the market. Radial Section, life size. Cross-section, magnified 37^2 diameters. Tangential Section, life size. 132 WOOD AND FOREST. 38 bark. YELLOW BIRCH. GRAY BIRCH. Yellow and gray, both refer to the color of the bark. Betula lutea F. A. Michaux. Betula, the classical Latin name; lutea refers to the yellow color of the Habitat Habitat: (S.eemap); best in northern New York and Few England. Leaf. Characteristics of the Tree: Height, 60'-100'; di- ameter, 3'-4'; branches, low; bark, silvery, yellow, gray, peeling horizontally into thin, papery, persist- ent layers, but on very old trunks, there are rough, irregular, plate-like scales; leaves, ovate, sharply, doubly serrate ; fruit, erect, 1" strobiles. Appearance of Wood: Color, light reddish brown, sap-wood white ; diffuse- porous; rings, obscure; grain, close, fairly straight; rays, numerous, obscure. Physical Qualities: Heavy (21st in this list) ; 40 Ibs. per cu. ft.; sp. gr., SPECIES OF WOODS. 133 0.0553; very strong (2nd in this list); very elastic (2d in this list) ; medium hard (22d in this list) ; shrinkage, 6 per cent. ; warps ; not durable ; rather hard to work, polishes well; splits with difficulty, holds nails well. Common Uses: Furniture, spools, button molds, shoe lasts, shoe pegs, pill boxes, yokes. Remarks: The birches are not usu- ally distinguished from one another in the market. Kauial ejection, life size. Cross-section, magnified 37^ diameters. 'langential section, life size. 134 WOOD AND FOREST. Habitat. 39 BEECH. Fagus grandifolia Ehrhart. Fagus americana Sweet. Fagus ferru- ginea Alton. Fagus atropunicea (Marshall) Sudworth. Fagus (Greek phago means to eat), refers to edible nut; ferruginea. refers to the iron rust color of the leaves in the fall; atropunicea, meaning dark red or purple, may refer to the color of the leaves of the copper beech. Habitat: (See map) ; best in southern Alleghany Mountains and lower Ohio valley. Characteristics of the Tree: Height, 70'-80' and even 120'; diameter, 3'-4' ; in forest, trunk tall, slen- der, sinewy; bark, smooth, ashy gray; leaves, feather- veined, wedge-shaped, ser- rate; leaf buds, long, pointed; fruit, 2 small triangular nuts, enclosed in burr, seeds about once in 3 years. Appearance of Wood: Color, reddish, variable, sap-wood white ; diffuse- porous ; rings, obscure grain, straight ; rays, broad, very conspicuous. Physical Qualities: Heavy (20th in this list) ; 42 Ibs. per cu. ft.; sp. gr., Leaf. SPECIES OP WOODS. 135 0.6883; very strong (10th in this list) ; elastic (13th in this list) ; hard (22d in this list) ; shrinkage, 5 per cent.; warps and checks during seasoning; not dur- able; hard to work, takes fine polish; splits with difficulty, hard to nail. Common Uses: Plane stocks, shoe lasts, tool handles, chairs. Remarks : Often forms pure forests . Uses due to its hardness. Radial Section, life size. Cross-section, magnified 37^2 diameters. Tangential Section, life size. 136 WOOD AND FOREST. 40 CHESTNUT. Castanea dentata (Marshall) Borkhausen. (aslanea, tlie classical Greek and Latin name; dentata, refers to toothed leaf. Habitat. Leaf. Habitat: (See map) ; best in western North Car- olina,, and eastern Ten- nessee. Characteristics of the Tree: Height, 75'-100'; diameter, 3'-4', and even 12'; branches, low; bark, thick, shallow, irregular, fissures, broad, grayish brown ridges ; leaves, lanceolate, coarsely ser- rate, midribs and veins prominent ; fruit, nuts, thin-shelled, sweet, en- closed in prickly burrs. Appearance of Wood : Color, reddish brown, sap- wood lighter ; ring-porous ; rings, plain, pores large; grain, straight; rays, nu- merous, obscure. Physical dualities : Weight, light (50th in this list), 28 Ibs. per cu. ft; sp. gr., 0.4504; me- dium strong (46th in this SPECIES OF WOODS. 137 list) ; elasticity, medium (46th in this list) ; medium hard (44th in this list) ; shrinkage, 6 per cent.; warps badly; very durable, especially in contact with soil, fairly easy to plane, chisel and saw ; splits easily. Common Uses: Eailway ties, fence posts, interior finish. Remarks: Grows rapidly, and lives to great age. Wood contains much tan- nic acid. Uses depend largely upon its durability. Lately whole regions depleted by fungous pest. Radial Section, life size. Cross-section, magnified 37^ diameters. langential Section, life size. Habitat. 138 WOOD AND FOREST. 41 BED OAK. Quercus rubra Linnaeus. Quercus, the classical Latin name; rubra, refers to red color of wood. Habitat: (See map); best in Massachusetts and north of the Ohio river. Characteristics of the Tree: Height, 70'-100'> even 150'; diameter, 3'-6'> a tall, handsome tree, branches rather low; bark brownish gray, broad, thin, rounded ridges, rathei smooth; leaves, 7 to 9 tri- angular pointed lobes ; with rounded sinuses > acorns, characteristicall) large, in flat shallow cups Appearance of Wood; Color, reddish brown, sap wood darker ; ring-por- ous ; rings, marked by sev eral rows of very large open ducts ; grain, crooked,, coarse; rays, few, but broad, conspicuous. Physical Qualities : Heavy (23d in this list), Leaf. SPECIES OF WOODS. 139 45 Ibs. per cu. ft. ; sp. gr., 0.6540 ; strong (21st in this list) ; elastic (18th in this list) ; hard (26th in this list) ; shrink- age 6 to 10 per cent. ; warps and checks badly; moderately durable; easier to work than white oak; splits readily, nails badly. Common Uses: Cooperage, interior finish, furniture. Remarks: Grows rapidly. An infe- rior substitute for white oak. Bark used in tanning. Radial Section, life size. Cross-section, magnified 37 l /2 diameters. Tangential Section, life sizt. 140 WOOD AND FOREST. 42 BLACK OAK. YELLOW BARK OAK. Black refers to color of outer bark; yellow bark, refers to the inner bark, which is orange yellow. Quercus velutina Lamarck. Quercus tinctoria Michaux. Quercus, the classical Latin name; velutina, refers to the velvety surface of the young leaf; tinctoria, refers to dye obtained from inner bark. Habitat: (See map); best in lower Ohio valley. Characteristics of the Tree: Height, 70'-80', even 150'; diameter 3'-4'; branches, low; bark, dark gray to black, deep fis- sures, broad, rounded, firm ridges, inner bark, yellow, yielding dye ; leaves, large, lustrous, leathery, of varied forms; acorns, small; kernel, yel- low, bitter. Appearance of Wood: Color, reddish brown, sap- wood lighter ; ring-por- ous; rings, marked by several rows of very large open ducts ; grain, crooked; rays, thin. Physical Qualities : Heavy (17th in this list), 45 Ibs. per cu. ft. ; sp. gr. ? Habitat. Leaf. SPECIES OF WOODS. 141 0.7045; very strong (17th in this list) ; elastic (25th in this list) ; hard (18th in this list) ; shrinkage, 4 per cent, or more; warps and checks in drying; dur- able; rather hard to work; splits read- ily, nails badly. Common Uses: Furniture, interior trim, cooperage, construction. Remarks : Foliage handsome in fall ; persists thru winter. Radial Section, life size. Cross-section, magnified z? 1 /^ diameters. Tangential Section, life size. 142 WOOD AND FOREST. 43 Habitat. BASKET OAK. Cow OAK. Cow refers to the fact that its acorns are eaten by cattle. Quercus michauxii Nuttali. Quercus, the classical Latin name; michauxii, named for the botanist Michaux. Habitat: (See map) ; best in Arkansas and Louisiana, especially in river bottoms. Characteristics of the Tree: Height, SO'-lOO'; diameter 3', even 7'; trunk, often clean and straight for 40' or 50'; bark, conspicuous, light gray, rough with loose ashy gray, scaly ridges; leaves, obovate, regularly scalloped ; acorns, edible for cattle. Appearance of Wood: Color, light brown, sap- wood light buff; ring-por- ous; rings, marked by few rather large, open ducts; grain, likely to be crooked; rays, broad, con- spicuous. Physical Qualities : Very heavy (5th in this Leaf. SPECIES OF WOODS. 143 list), 46 Ibs. per cu. ft.; sp. gr., 0.8039; very strong (12th in this list); elastic (33d in this list); hard (10th in this list); shrinkage, 4 per cent, or more; warps unless carefully seasoned; dur- able; hard and tough to work; splits easily, bad to nail. Common Uses: Construction, agri- cultural implements, wheel stock, bas- kets. Remarks: The best white oak of the south. Not distinguised from white oak in the market. Radial bection, life size. Cross-section, magnified 37^ diameters. Tangential bection, life size. 144 WOOD AND FOREST. 44 BUR OAK. Mossy-Cup OAK. OVER-CUP OAK. Quercus macrocarpa Michaux. Quercus, the classical Latin name; macrocarpa, refers to the large acorn. Habitat. Leaf. Habitat: (See map) ; best in southern Indiana, Illinois and Kansas. Characteristics of the Tree: Height, 70'-130', even 170'; diameter, 5'-7'; branches, high ; corky wings on young branches; bark, gray brown, deeply furrowed ; deep opposite sinuses on large leaves; acorns, half enclosed in mossy-fringed cup. Appearance of Wood: Color, rich brown, sap- wood, thin, lighter; ring- porous; rings, marked by 1 to 3 rows of small open ducts ; grain, crooked ; rays, broad, and conspic- uous. Physical Qualities : Heavy (9th in this list), 46 Ibs. per cu. ft.; sp. gr., 0.7453; very strong (16th SPECIES OF WOODS. 145 in this list) ; elastic (37th in this list) ; hard (9th in this list) ; shrinkage, 4 per cent or more ; warps, ; hard, and tough to work; splits easily, resists nailing. Common Uses: Ship building, cabi- net work, railway ties, cooperage. Remarks: Good for prairie plant- ing. One of the most valuable woods of North America. Not distinguished from White Oak in commerce. Radial Section, life size. Cross-section, magnified 37^2 diameters. Tangential Section, life size. 146 WOOD AND FOREST. 45 WHITE OAK (Western). Quercus garryana Douglas. Quercus, the classical Latin name; garryana, named for Garry. Habitat. Leaf. Habitat: (See map); best in western Washing- ton and Oregon. Characteristics of the Tree: Height, 60'-70', even 100'; diameter, 2'- 3' ; branches, spreading ; bark, light brown, shallow fissures, broad ridges ; leaves, coarsely pinnati- fied, lobed; fruit, large acorns. Appearance of Wood: Color, light brown, sap- wood whitish ; ring-por- ous; rings, marked by 1 to 3 rows of open ducts; grain, close, crooked ; rays, varying greatly in width, often conspicuous. Physical Qualities : Heavy (10th in this list), 46 Ibs. per cu. ft; sp. gr., 0.7449; strong (28th in this list) ; elasticity me- SPECIES OP WOODS. 147 dium (54th in this list); hard (8th in this list); shrinkage, 5 or 6 per cent.; warps, unless carefully seasoned; dur- able; hard to work, very tough; splits badly in nailing. Common Uses: Ship building, ve- hicles, furniture, interior finish. Remarks: Best of Pacific oaks. Shrubby at high elevations. Radial Section, life size. Cross-section, magnified 37^ diameters. Tangential Section, life size. 148 WOOD AXD FOREST. 46 POST OAK. Quercus stellata Wangenheim. Quercus minor (Marsh) Sargent. Quercus obtusiloba Michaux. Quercus, the classical Latin name; stellata, refers to the stellate hairs on upper side of leaf; minor, refers to size of tree, which is often shrubby; obtusiloba, refers to the blunt lobes of leaves. Habitat. Leaf. Habitat: (See map) ; best in Mississippi basin. Characteristics of the Tree : Height, 5^-75', even 100'; but often a shrub ; diameter, 2'-3' ; branches, spreading into dense round-topped head; bark, red or brown, deep, vertical, almost continu- ous, fissures and broad ridges, looks corrugated ; leaves, in large tufts at ends of branchlets ; acorns, small, sessile. Appearance of Wood: Color, brown, thick, sap- wood, lighter ; ring-por- ous; rings, 1 to 3 rows of not large open ducts; grain, crooked; rays, nu- merous, conspicuous. Physical dualities : Yery heavy (2d in this list), 50 Ibs. per cu. ft.; SPECIES OF WOODS. 149 sp. gr., 0.8367; strong (29th in this list) ; medium elastic (50th in this list) ; very hard (4th in this list) ; shrinkage, 4 per cent, or more; warps and checks badly in seasoning; durable; hard to work; splits readily, bad to nail. Common Uses: Cooperage, railway ties, fencing, construction. Remarks : Wood often guished from white oak. unclistin- Radial Section, life size. Cross-section, magnified 37^ diameters. Tangential Section, life size. Habitat. 150 WOOD AND FOREST. 47 WHITE OAK. STAVE OAK. Quercus alba Linnaeus. Quercus, the classical Latin name; white and alba, refer to white bark. Habitat: (See map) ; best on western slopes of Southern Alleghany Mountains, and in lower Ohio river valley. Characteristics of the Tree: Height, 80'-100'; diameter, 3'-5'; trunk, in forest, tallj in open, short ; bark, easily distinguished, light gray with shallow fissures, scaly ; leaves, rounded lobes, and sin- uses; acorns., y/\" to 1" long, ripen first year. Appearance of Wood: Color, light brown, sap- wood paler; ring-porous; rings, plainly defined, by pores ; grain crooked ; rays, broad, very conspic- uous and irregular. Physical Qualities : Heavy (8th in this list), Leaf> 50 Ibs. per cu. ft. ; sp. SPECIES OF WOODS. 151 gr., 0.7470; strong (23d in this list); elastic (32d in this list); hard (13th in this list) ; shrinkage, from 4 to 10 per cent.; warps and checks consider- ably, unless carefully seasoned; very dur- able, hard to work; splits somewhat hard, very difficult to nail. Common TJses : Interior finish, furni- ture, construction, ship building, farm implements, cabinet making. Remarks: The most important of American oaks. Radial Section, life size. Cross-section, magnified 37 y 2 diameters. Tangential Section, life size. 152 WOOD AND FOREST. Habitat. 48 CORK ELM. EOCK ELM. HICKORY ELM. WHITE ELM. CLIFF ELM. Cork refers to corky ridges on branches. Ulmus tliomasi Sargent. Ulmus racemosa Thomas. Ulmus, the classical Latin name; racemosa, refers to racemes of flowers. Habitat: (See map) ; best in Ontario and south- ern Michigan. Characteristics of the Tree: Height, 80'-100'; diameter, 2'-3', trunk of- ten clear for 60'; bark, gray tinged with red, corky, irregular projec- tions, give shaggy appear- ance ; leaves, obovate, doubly serrate, 3"-4" long ; fruit, pubescent, samaras. Appearance of Wood: Color, light brown or red; sap-wood yellowish; ring- porous; rings, marked with one or two rows of small open ducts; grain, interlaced ; rays, numer- ous, obscure. Physical Qualities : Heavy (15th in this list). 45 Ibs. per cu. ft. ; sp. gr., Leaf. 0.7263; very strong (13th SPECIES OF WOODS. 153 in this list) ; elastic (22d in this list) ; hard (15th in this list) ; shrinkage, 5 per cent. ; warps, ; very dur- able; hard to work; splits and nails with difficulty. Common Uses: Hubs, agricultural implements, sills, bridge timbers. Remarks: The best of the elm woods. Radial Section, life size. Cross-section, magnified 37^ diameters. Tangential Section, life size. 154 WOOD AND FOEEST. 49 WHITE ELM. AMERICAN ELM. WATER ELM. Water, because it flourishes on river banks. Ulmus americana Linnaeus. Vlmus, the classical Latin name. \ \\ Habitat. Leaf. Habitat: (See map); best northward on river bottoms. Characteristics of the Tree: Height, 90', even 120'; diameter, 3'-8'; trunk,, usually divides at 30'-40' from ground into upright branches, making triangular outline; bark, ashy gray, deep longitu- dinal fissures, broad ridges ; leaves, 4"-6" long, oblique obovate^ doubly serrate, smooth one way; fruit, small, roundish, flat, smooth, sa- maras. Appearance of Wood: Color, light brown, sap- wood yellowish; ring-po- rous; rings, marked by "several rows of large open ducts ; grain, interlaced ; rays, numerous, thin. SPECIES OF WOODS. 155 Physical Qualities: Heavv (24th in -f 0.5-6 this list, 4 Ibs. per cu. ft; sp. gr., 0.6506; strong (33d in this list); elasticity, medium (59th in this list) ; medium hard (28th in this list) ; shrink- age, 5 per cent. ; warps ; not durable; hard to work, tough, will not polish; splits with difficulty. Common Uses: Cooperage, wheel stock, flooring. Remarks: Favorite ornamental tree, but shade light, and leaves fall early. Radial Section, life size. Cross-section, nngnified 37^ diameters. 'J angeiitial Section, life size. 156 WOOD AND FOREST. 50 CUCUMBER TREE. MOUNTAIN MAGNOLIA. Cucumber, refers to the shape of the fruit. Magnolia acuminata Linnaeus. Magnolia, named for Pierre Magnol, a French botanist; acuminata, re- fers to pointed fruit. Habitat: (See map) ; best at the base of moun- tains in North Carolina and South Carolina and Tennessee. Characteristics of the Tree: Height, 60'-90'; diameter, 3'-4'; in forest, clear trunk for 2/3 of height (40' or 50') ; bark, dark brown, thick, fur- rowed ; leaves, large, smooth ; flowers, large greenish yellow ; fruit, dark red "cones" formed of two seeded follicles. Appearance of Wood: Color, yellow brown, thick sapwood, lighter; diffuse- porous; rings, obscure; grain, very straight, close, Habitat. satiny ; thin. rays, numerous Leaf. Physical Qualities: Light (45th in this list), SPECIES OF WOODS. 157 . . . . Ibs. per cu. ft. ; sp. gr., 0.4690 ; medium strong (49th in this list) ; elas- tic (38th in this list); medium hard (41st in this list) ; shrinkage, 5 per cent. ; warps ; very dur- able; easy to work; splits easily, takes nails well. Common Uses: Pump logs, cheap furniture, shelving. Remarks: Wood similar to yellow poplar, and often sold with it. Radial Section, life size. Cross-section, magnified 37^ diameters. Tangential Section, life size. 158 WOOD AND FOREST. Habitat. 51 YELLOW POPLAR. WHITEWOOD. TULIP TREE. Poplar, inappropriate, inasmuch as the tree does not belong to poplar family. White, refers inappropriately to the color of the wood, which is greenish yellow. Liriodendron tulipifera Linnaeus. Liriodendron, means lily-tree; tulipifera means tulip-bearing. Habitat: (See map) ; best in lower Ohio valley and southern Appalach- ian mountains. Characteristics of the Tree: Height, 70'-90';, even 200'; diameter, 6'-8', even 12'; tall, magnifi- cent trunk, unsurpassed in grandeur by any east- ern American tree; bark, brown, aromatic, evenly furrowed so as to make clean, neat-looking trunk; leaves, 4 lobed, apex, pe- culiarly truncated, clean cut; flowers, tulip-like; fruit, cone, consisting of many scales. Appearance of Wood: Color, light greenish or yellow brown, sap-wood, creamy white ; diffuse- porous; rings, close but distinct ; grain, straight ; rays, numerous and plain. Leaf. SPECIES OF WOODS. 159 Physical Qualities: Light (54th in this list), 26 Ibs. per cu. ft.; sp. gr., .4230; medium strong (51st in this list) ; elastic (39th in this list) ; soft (49th in this list) ; shrinkage, 5 per cent; warps little; durable; easy to work; brittle and does not split readily, nails very well. Common Uses: Construction work, furniture, interiors, boats, carriage bod- ies, wooden pumps. Remarks: Being substituted largely for white pine. Radial Section, life size. Cross-section, magnified 37 J4 diameters. Tangential Section, life size. 160 WOOD AND FOREST. Habitat. SWEET GUM. Gum, refers to exudations. Liquidambar styraciflua Linnaeus. Liquidamlar, means liquid gum; styraciflua, means fluid resin (storax). Habitat: (See map) ; best in the lower Mississ- ippi valley. Characteristics of the Tree: Height, 80'-140'; diameter, 3'-5' ; trunk, tall, straight; bark, light brown tinged with red, deeply fissured ; branch- lets often having corky wings; leaves, star-shaped, five pointed ; conspicu- ously purple and crimson in autumn; fruit, multi- capsular, spherical, per- sistent heads. Appearance of Wood: Color, light red brown, sap-wood almost white ; diffuse-porous ; rings, fine and difficult to distin- guish ; grain, straight, close, polishes well; rays, numerous, very obscure. Physical Qualities : Weight, medium (34th in i a SPECIES OF WOODS. 161 this list), 37 Ibs. per cu. ft.; sp. gr., 0.5909; medium strong (52d in this list; elasticity medium (44th in this list) ; medium hard (36th in this list) ; shrinkage, 6 per cent.; warps and twists badly in seasoning; not durable svhen exposed; easy to work; crumbles in splitting; nails badly. Common Uses: Building construc- tion, cabinet-work, veneering, street pavement, barrel staves and heads. Remarks: Largely used in veneers, because when solid it warps and twists badly. Exudations used in medicine to some extent. Radial Section, life size. Cross-section, magnified 37^ diameters. Tangential Section, life size. 162 WOOD AND FOREST. 53 SYCAMORE. BUTTONWOOD. BUTTON BALI,. WATER BEECH. Sycamore, from two Greek words meaning fig and mulberry; buttonwood and button-ball, refer to fruit balls. Platanus occidentalis Linnaeus. Platanus, refers to the broad leaves; occidentalis, western, to distinguish it from European species. Habitat. Leaf. Habitat: (See map); best in valley of lower Ohio and Mississippi. Characteristics of the Tree: Height, 70'-100', and even 170'; diameter, 6'-12'; trunk, commonly divides into 2 or 3 large branches, limbs spreading, often dividing angularly ; bark, flakes off in great irregular masses, leaving mottled surface, greenish gray and brown, this pe- culiarity due to its rigid texture; leaves, palmately 3 to 5 lobed, 4"-9" long, petiole enlarged, enclosing buds; fruit, large rough balls, persistent through winter. Appearance of Wood : Color, reddish brown, sap- wood lighter ; diffuse- porous; rings, marked by SPECIES OF WOODS. 163 broad bands of small ducts ; grain, cross, close; rays, numerous, large, conspicu- ous. Physical Qualities: Weight, medium (38th in this list), 35 Ibs. per cu. ft.; sp. gr., 0.5678; medium strong (54th in this list) ; elasticity, medium (43d in this list; medium hard (30th in this list) ; shrinkage, 5 per cent. ; warps little; very durable, once used for mummy coffins; hard to work; splits ?ery hard. Common Uses: Tobacco boxes, yokes, furniture, butcher blocks. Remarks: Trunks often very large and hollow. Radial Section, life size. Cross-section, magnified 37^2 diameters. Tangential Section, life size. Habitat. 164 WOOD AND FOREST. 54 WILD BLACK CHERRY. Padus serotina (Ehrhart) Agardh. Prunus serotina Ehrhart. Padus, the old Greek name; prunus, the classical Latin name; serotina, because it blossoms late (June). Habitat: (See map) ; best on southern Allegheny mountains. Characteristics of the Tree: Height, 40'-50', even 100'; diameter, 2'-4'; straight, columnar trunk, often free from branches for 70'; bark, blackish and rough, fissured in all directions, broken into small, irregular, scaly plates, with raised edges; leaves, oblong to lanceo- late, deep, shiny green; fruit, black drupe, y 2 ". Appearance of Wood: Color, light brown or red, sap-wood yellow; diffuse- porous ; rings, obscure ; grain, straight, close, fine, takes fine polish ; rays, numerous. Physical Qualities : Weight, medium (35th in Leaf. SPECIES OF WOODS. 165 this list), 36 Ibs. per cu. ft.; sp. gr., 0.5822; strong (35th in this list) ; elas- ticity medium (45th in this list) ; hard (16th in this list); shrinkage, 5 per cent.; warps, little; durability ; easily worked ; splits eas- ily, must be nailed with care. Common Uses: Cabinet-work, costly interior trim. Remarks: Grows rapidly. Radial Section, life size. Cross-section, magnified 37^ diameters. Tangential Section, life size. 166 WOOD AND FOREST. 55 BLACK LOCUST. LOCUST. YELLOW LOCUST. Yellow, from color of sap-wood. Robinia pseudacacia Linnaeus. Robinia, in honor of Jean Robin, of France; pseudacacia, means false acacia. Habitat. Leaf. Habitat: (See map); best on western Allegheny mountains in West Vir- ginia. Characteristics of the Tree : Height, 50'-80' ; diameter, 3'-4' ; bark, strikingly deeply fur- rowed, dark brown ; prickles on small branches, grows fast, forms thick- ets, on account of under- ground shoots ; leaves, 8"-14" long, pinnately compound; 7 to 9 leaf- lets, close at night and in rainy weather; fruit, pod 3"-4" long. Appearance of Wood: Color, brown, sap-wood thin, yellowish ; ring-por- ous; rings, clearly marked by 2 or 3 rows of large open ducts ; grain, crooked, compact. SPECIES OF WOODS. 167 Physical Qualities: Heavy (12th in .this list), 45 Ibs. per cu. ft.; sp. gr., 0.7333; very strong (1st in this list); elastic (9th in this list) ; very hard (6th in this list) ; shrinkage, 5 per cent.; warps badly, very durable; hard to work, tough; splits in nailing. Common Uses: Shipbuilding, con- struction, "tree-nails" or pins, wagon hubs. Remarks: Widely planted and cul- tivated east and west. Likely to be in- fested with borers. Radial Section, life size. Cross-section, magnified 37 H diameters. Tangential Section, life size. 168 WOOD AND FOREST. 56 MAHOGANY. Swietenia mahagoni Jacquin. Swietenia, in honor of Dr. Gerard Van Swieten of Austria; mahagoni, a South American word. Habitat. Leaf. Habitat: (See map) ; only on Florida Keys in the United States. Characteristics of the Tree: Height, 40'-50'; diameter, 2' or more, for- eign trees larger; immense buttresses at base of trunk ; bark, thick, dark red- brown, having surface of broad, thick scales; leaves, 4"-6" long, compound, 4 pairs of leaflets; fruit, 4"-5" long, containing seeds. Appearance of Wood: Color, red-brown, sap- wood, thin, yellow dif- fuse-porous; rings, incon- spicuous ; grain, crooked ; rays, fine and scattered, but plain. Physical Qualities : Heavy (14th in this list), 45 Ibs. per cu. ft. ; sp. gr., 0.7282; very strong (20th in this list) ; elastic (24th in this list) ; very hard (1st in this list) ; shrink- SPECIES OF WOODS. 169 age, 5 per cent. ; warps very little ; very durable; genuine mahogany,, hard to work; especially if grain is cross; some- what brittle, and comparatively easy to split, nails with difficulty; polishes and takes glue well. Common Uses: Chiefly for cabinet- making, furniture, interior finishes and veneers. Remarks: Mahogany, now in great demand in the American market for fine furniture and interior trim comes from the West Indies, Central America and West Africa. The so-called Spanish mahogany, the most highly prized va- riety, came originally from the south of Hayti. The Honduras Mahogany was often called baywood. Botanically the varieties are not carefully distinguished ; in the lumber yard the lumber is known by its sources. The Cuba wood can be partly distinguished by the white chalk- like specks in the pores and is cold to the touch, while the Honduras wood can be recognized by the black specks or lines in the grain. Both the Honduras and West India woods have a softer feel than the African wood, when rubbed with the thumb. The Cuba and St. Do- mingo wood are preferred to the Hon- duras, and still more to the African, but even experts have difficulty in distin- guishing the varieties. Spanish cedar, or furniture cedar (Cedrela odorata) belongs to the same family as mahogany and is often sold for it. It is softer, lighter, and easier to work. Radial Section, life size. Tangential Section, life size. 170 WOOD AND FOREST. 57 OREGON MAPLE. WHITE MAPLE. LARGE LEAVED MAPLE. Acer macro phyUum Pursh. Acer, the classical Latin name; macrophyllum, refers to the large leaves. Habitat. Leaf. Habitat : ( See map) ; best in southern Oregon. Characteristics of the Tree: Height, 70'-100'; diameter, 3'-5'; stout, of- ten pendulous branches, making a handsome tree; bark, reddish brown, deeply furrowed, square scales; leaves, very large, 8"-12" and long petioles, deep, narrow sinuses ; fruit, hairy samaras. Appearance of Wood: Color, rich brown and red, sap-wood thick, nearly white ; diffuse-porous ; rings, obscure ; grain, close, fibres interlaced, sometimes figured, pol- ishes well; rays, numer- ous and thin. Physical Qualities : Light in weight (26th in this list), 30 Ibs. per cu. SPECIES OF WOODS. 171 ft., sp. gr. 0.4909 ; medium strong (47th in this list) ; elasticity medium (57th in this list) ; medium hard (31st in this list) ; shrinkage, 4 per cent. ; warps ; not durable ; rather hard to work; splits with difficulty. Common Uses: Tool and ax handles, furniture, interior finish. Remarks : Pacific coast. A valuable wood on the Radial Section, life size. Cross-section, magnified 37^2 diameters. Tangential Section, life size. 172 WOOD AND FOREST. 58 Habitat. SOFT MAPLE. WHITE MAPLE. SILVER MAPLE. Silver, refers to white color of underside of leaf. Acer saccharinum Linnaeus. Acer dasycarpum Ehrhart. Acer, the classical Latin name; saccharinum, refers to sweetish juice; dasycarpum, refers to the wooliness of the fruit when young. Habitat: (See map) ; best in lower Ohio valley. Characteristics of the Tree : Height, 50'-90', even 120'; diameter, 3'-5'; form suggests elm; bark, reddish brown, furrowed, surface separating into large, loose scales; leaves, palmately 5 lobed, with narrow, acute sinuses, sil- very white beneath, turn only yellow in autumn; fruit, divergent, winged samaras. Appearance of Wood: Color, brown and reddish, sap-wood, cream; diffuse- porous ; rings, obscure ; grain, twisted, wavy, fine, polishes well; rays, thin, numerous. Physical Qualities : Weight, medium (40th in this list), 32 Ibs. per cu. Leaf. SPECIES OP WOODS. 173 ft.; sp. gr., 0.5269; very strong (19th in this list; very elastic (20th in this list) ; hard (25th in this list) ; shrink- age,, 5 per cent. ; warps, ; not durable under exposure; easily worked; splits in nailing. Common Uses: Flooring, furniture, turnery, wooden ware. Remarks: Grows rapidly. Curly varieties found. Sap produces some sugar. Radial Section, life size. Cross-section, magnified 37^2 diameters. Tangential Section, life size. 174 WOOD AND FOREST. 59 RED MAPLE. Acer rubrum Linnaeus. Acer, the classical Latin name; rubrum, refers to red flowers and autumn leaves. Habitat. Leaf. Habitat: (See map) ; best in lower Ohio valley. Characteristics of the Tree: Height, 80'-120'; diameter, 2'-4'; branches, low; bark, dark gray, shaggy, divided by long ridges ; leaves, palmately 5 lobed, acute sinuses; fruit, double samaras, forming characteristic ma- ple key. Appearance of Wood: Color, light reddish brown, sap-wood, lighter; diffuse- porous ; rings, obscure ; grain, crooked; rays, nu- merous, obscure. Physical Qualities : Weight, medium (30th in this list), 38 Ibs, per cu. ft.; sp. gr., 0.6178; strong (36th in this list) ; elas- tic (36th in this list) ; hard (27th in this list) ; SPECIES OP WOODS. 17 shrinkage, 5 per cent. ; warps ; not durable; fairly hard to work; splits with difficulty, splits badly in nailing. Common Uses : wooden ware. Flooring, turning, Remarks: Grows rapidly. Has red flowers, red keys, red leaf stems, and leaves scarlet or crimson in autumn. Radial Section, life size. Cross-section, magnified 37^ diameters. Tangential Section, life size. 176 WOOD AND FOREST. Habitat. 60 HARD MAPLE. SUGAR MAPLE. EOCK MAPLE. Acer saccharum Marshall. Acer, the classical Latin name; saccharum, refers to sweet sap. Habitat: (See map) ; best in regions of Great Lakes. Characteristics of the Tree: Height, 100'-120'; diameter, l^'-S', even 4'; often trees in forest are without branches for 60'- 70' from ground, in the open, large impressive tree; bark, gray brown, thick, deep, longitudinal fissures, hard and rough; leaves, opposite, 3 to 5 lobed, scarlet and yellow in autumn; fruit, double, slightly divergent samaras. Appearance of Wood: Color, light brown tinged with red ; diffuse-porous rings, close but distinct; grain, crooked, fine, close, polishes well; rays, fine but conspicuous. Physical Qualities : Heavy (19th in this list). Leaf. SPECIES OF WOODS. 177 43 Ibs. per cm. ft.; sp. gr., 0.6912; very strong (8th in this list) ; very elastic (5th in this list) ; very hard (7th in this list) ; shrinkage, 5 per cent. ; warps badly; not durable when exposed; hard to work; splits badly in nailing. Common Uses: School and other fur- niture, car construction,, carving, wooden type, tool handles, shoe lasts, piano ac- tions, ships' keels. Remarks: Tree very tolerant. The uses of this wood are chiefly due to its hardness. Bird's-Eye Maple and Curly Maple are accidental varieties. Pure maple sugar is made chiefly from this species. Its ashes yield large quantities of potash. Radial Section, life size. Cross-section, magnified 37^ diameters. Tangential Section, life size. 178 WOOD AND FOREST. 61 BASSWOOD. LINDEN. Bass, refers to .bast or inner bark. Tilia americana Linnaeus. Tilia, the classical Latin name. Habitat. Leaf. Habitat: (See map); best in bottom lands of lower Ohio Eiver. Characteristics of the Tree: Height, G0'-70', even 130'; diameter, 2'-4'; trunk, erect, pillar-like, branches spreading, mak- ing round heads; bark, light brown, furrowed, scaly surface, inner bark fibrous and tough, used for matting ; leaves, oblique, heart-shaped, side nearest branch larger ; fruit clustered on long pendulous stem, attached to vein of narrow bract. Appearance of Wood: Color, very light brown, approaching cream color, sap-wood, hardly distin- guishable ; diffuse-porous ; rings, fine and close but clear; grain, straight: rays, numerous, obscure. SPECIES OF WOODS. .179 Physical Qualities: Light in weight (49th in this list), 28 Ibs. per cu. ft.; sp. gr., 0.4525; weak (60th in this list) ; elasticity, medium (49th in this list) ; soft (64th in this list) ; shrinkage, 6 per cent. ; warps comparatively little ; quite durable; very easily worked; some- what tough to split, nails well. Common Uses: Woodenware, carriage bodies, etc., picture molding, paper pulp, etc. Remarks: May be propagated by grafting as well as by seed. Is subject to attack by many insects. Wood used for carriage bodies because flexible and easilv nailed. Radial Section, life size. Cross-section, magnified 37^ diameters. Tangential Section, life size. 180 WOOD AND FOREST. 62 SOUR GUM. TUPELO. Tupelo, the Indian name. PEPPERIDGE. BLACK GUM. Nyssa sylvatica Marshal. Nyssa, from Nysa, the realm of moist vegetation and the home of Dio-nysus (Bacchus) (the tree grows in low wet lands) ; sylvatica, refers to its habit of forest growth. \ Habitat. Leaf. Habitat: (See map); best in Southern Appala- chian mountains. Characteristics of the Tree : Height, 40'-50', even 100'; diameter, 1"- 6", even 5' variable in form; bark, brown, deeply fissured and scaly; leaves, in sprays, short, petioled, brilliant scarlet in au- tumn; fruit, bluish black, sour, fleshy drupe. Appearance of Wood: Color, pale yellow, sap- wood, white, hardly dis- tinguishable ; diffuse-por- ous; rings, not plain; grain fine, twisted and in- terwoven ; rays, numer- ous, thin. Physical Qualities : Medium heavy (25th in this list), 39 Ibs. per cu. ft; sp. . gr., 0.6356; SPECIES OF WOODS. 181 strong (34th in this list) ; elasticity, medium (51st in this list) ; hard (20th in this list) ; shrinkage, 5 or 6 per cent. ; warps and checks badly ; not durable if exposed; hard to work; splits hard, tough. Common Uses: Wagon hubs, handles, yokes, wooden shoe soles, docks and wharves, rollers in glass factories. Remarks : The best grades closely re- semble yellow poplar. Kadial Section, life size. Cross-section, magnified 37^ diameters. Tangential Section, life size. 182 WOOD AND FOREST. Habitat. BLACK ASH. HOOP ASH. Hoop, refers to its use for barrel hoops. Fraxinus nigra Marshall. Fraxinus scambucifolia. Fraxinus, from a Greek word (phraxis) meaning split, refers to the cleavability of the wood; sambucifolia, refers to the fact that the leaves are in odor like those of Elder (Sambucus). Habitat: (S;ee map) ; best in moist places. Characteristics of the Tree: Height, 80'-90'; di- ameter, I'-IJ^'; slender- est of the forest trees, up- right branches; bark, gray tinged with red, irregular plates, with thin scales; leaves, 10"-16" long, com- pound, 7 to 11 leaflets, in autumn rusty brown ; fruit, single samaras in panicles. Appearance of Wood: Color, dark brown, sap- wood light; ring-porous; rings, well defined; grain, straight, burls often form highly prized veneers ; rays, numerous and thin. Physical Qualities : Medium heavy (27th in this list), 39 Ibs. per cu. ft.; sp. gr., 0.6318; strong Leaf. SPECIES OF WOODS. 183 (38th in this list) ; elasticity, medium (12th in this list) ; hard (23d in this list) ; shrinkage, 5 per cent. ; warps, but not very much; not durable when exposed; hard to work; separates easily in layers, hence used for splints. Common Uses: Interior finish, cab- inet work, fencing, barrel hoops. Remarks: The flexibility of the wood largely determines its uses. Radial Section, life size. Cross-section, magnified 37 Yz diameters. Tangential Section, life size. 184 WOOD AND FOREST. 64 OREGON ASH. Fraxinus oregona Nuttall. Fraxinus, from a Greek word (phraxis) meaning split, refers to the cleavability of the wood ; oregona, named for the State of Oregon. Habitat. Leaf. Habitat: (See map); best in southern Oregon. Characteristics of the Tree: Height, 50'-80'; di- ameter, 1'-1J^', even 4'; branches, stout, erect; bark, grayish brown, deep interrupted fissures, broad, flat ridges, exfoliates ; leaves, 5"-14" long; pin- nately compound, 5 to 7 leaflets; fruit, single sa- maras in clusters. Appearance of Wood: Color, brown, sap-wood thick, lighter ; ring-por- ous ; rings, plainly marked by large, open, scattered pores ; grain, coarse, straight; rays, numerous, thin. Physical Qualities : Weight, medium (37th in this list), 35 Ibs. per cu. ft; sp. gr., 0.5731; me- SPECIES OF WOODS. 185 dium strong (50th in this list) ; elastic- ity, medium (48th in this list; me- dium hard (29th in this list) ; shrink- age, 5 per cent. ; warps, ; not durable; hard to work, tough: splits with difficulty. Common Uses: Furniture, vehicles, cooperage. Remarks: A valuable timber tree of the Pacific coast. Radial Section, life size. Cross-section, magnified 37^ diameters. Tangential Section, life size. 186 WOOD AND FOREST. 65 BLUE ASH. Blue, refers to blue dye obtained from inner bark. Fraxinus quadrangulata Michaux. Frdxinus, from a Greek word (phraxis) meaning split, refers to the cleavabilty of the wood; quadrangulata, refers to four-angled branchlets. Habitat. Leaf. Habitat: (S;ee map) ; best in lower Wabash val- ley. Characteristics of the Tree: Height, 60'-70' ; even 120'; diameter, l'-2'; tall, slender, four-angled,, branchlets ; bark, light gray, irregularly divided into large plate-like scales, inside bark, bluish, yield- ing dye; leaves, 8"-12" long, compound pinnate, 5 to 9 leaflets; fruit, winged samaras in pan- icles. Appearance of Wood: Color, light yellow, streaked with brown, sap- wood lighter ; ring-por- ous ; rings, clearly marked by 1 to 3 rows of large, open ducts ; grain, straight; rays, numerous, obscure. SPECIES OF WOODS. 187 Physical Qualities: Heavy (16th in this list), 44 Ibs. per cu. ft.; sp. gr., 0.7184; strong (37th in this list) ; elas- ticity, medium (58th in this list) ; hard (12th in this list); shrinkage, 5 per cent. ; warps, ; most dur- able of the ashes; hard to work; splits readily, bad for nailing. Common Uses: Carriage building, tool handles. Remarks: Blue ash pitchfork han- dles are famous. Radial Section, life size. Tangential Section, life size. 188 WOOD AND FOREST. Habitat. 66 BED ASH. Red, from color of inner bark. Fraxinus pennsylvanica Marshall. Fraxinus pubescens Lambert. 63. Engelmann's spruce. Fraxinus, from a Greek word (phraxis) meaning split, refers to the cleavability of the wood; pennsylvanica, in honor of the State of Pennsyl- vania; pubescens, refers to down on new leaves and twigs. Habitat: (See map); best east of Alleghany mountains. Characteristics of the Tree: Height, 40'-60'; di- ameter, 12"-18"; small, slim, upright branches ; bark, brown or ashy, great, shallow, longitudinal fur- rows ; leaves, 10"-12" long, pinnately compound, 7 to 9 leaflets, covered with down; fruit, single samara. Appearance of Wood: Color, light brown, sap- wood lighter and yellow- ish; ring porous; rings, marked by pores ; grain, straight, coarse ; rays, numerous, thin. Physical Qualities : Weight, medium (28th in this list), 39 Ibs. per cu. ft.; sp. gr., 0.6251; strong Leaf. SPECIES OF WOODS. 189 (30th in this list) ; elasticity, medium (53d in this list; hard (17th in this list) ; shrinkage, 5 per cent.; warps lit- tle; not durable; hard to work; splits in nailing. Common Uses: Agricultural imple- ments, oars, handles, boats. Remarks: Often sold with and as the superior white ash. Radial Section, life size. Cross-section, magnified 37^2 diameters. Tangential Section, life size. 190 WOOD AND FOREST. Habitat. 67 WHITE ASH. White, refers to whitish color of wood. Fraxinus americana Linnaeus. Fraxinus, from a Greek word (phraacis) meaning split, refers to the leavability of the wood. Habitat: (See map); best in the bottom lands- of lower Ohio valley. Characteristics of the Tree : Height, 70'-80' ? even 120'; diameter, 3'-6'; branches rather high, tree singularly graceful; bark, gray, narrow furrows, clean, neat trunk; leaves, 8"-15" long, compound, tufted, smooth, turns in autumn to beautiful pur- ples, browns and yellows; fruit, panicles of samaras, persistent till midwinter. Appearance of Wood: Color, light reddish brown, sap-wood whitish ; ring- porous, rings clearly marked by pores ; straight- grained; pith rays ob- scure. Physical Qualities r Heavy (22d in this list), 39 Ibs. per cu. ft. ; sp. gr.,, Leaf. SPECIES OF WOODS. 191 0.6543; strong (31st in this list); elas- tic (30th in this list) ; hard (17th in this list) ; shrinkage, 5 per cent. ; warps little ; not durable in contact with soil ; hard and tough; splits readily, nails badly. Common Uses: Inside finish, farm implements, barrels, baskets, oars, car- riages. Remarks: Forms no forests, occurs scattered. Its uses for handles and oars determined by combination of strength, lightness and elasticity. Radial Section, life size. Cross-section, magnified 37^ diameters. Tangential Section, life size. 192 WOOD AND FOREST. LIST OF 66 COMMON WOODS ARRANGED IN THE ORDER OF THEIR WEIGHT. 1. Shellbark hickory. 2. Post oak. 3. Mockernut. 4. Pignut. 5. Basket oak. 6. Cherry birch. 7. Slash pine. 8. White oak. 9. Bur oak. 10. Western white oak. 11. Western larch. 12. Black locust. 13. Blue beech. 14. Mahogany. 15. Cork elm. 16. Blue ash. 17. Black oak. 18. Longleaf pine. 19. Hard maple. 20. Beech. 21. Yellow birch. 22. White ash. 23. Eed oak. 24. White elm. 25. Sour gum. 26. Oregon maple. 27. Black ash. 28. Eed ash. 29. Tamarack. 30. Red maple. 31. Black walnut. 32. Shortleaf pine. 33. Canoe birch. 34. Sweet gum. 35. Wild black cherry. 36. Eed birch. 37. Oregon ash. 38. Sycamore. 39. Loblolly pine. 40. Soft maple. 41. Douglas spruce. 42. Eed cedar. 43. Norway pine. 44. Western yellow pine. 45. Cucumber tree. 46. Lawson cypress. 47. Black spruce and Eed spruce. 48. Bald cypress. 49. Basswood. 50. Chestnut. 51. Black willow. 52. Tideland spruce. 53. Hemlock. 54. Yellow poplar. 55. Bed wood. 56. Butternut. 57. White spruce. 58. Western white pine. 59. White pine. 60. Western red cedar. 61. Sugar pine. 62. Grand fir. 63. Engelmann's spruce. 64. White cedar. 65. Big tree. SPECIES OF WOODS. 193 LIST OF 66 COMMON WOODS ARRANGED IN THE ORDER OF THEIR STRENGTH. 1. Black locust. 2. Yellow birch. 3. Western larch. 4. Cherry birch. 5. Shellbark hickory. 6. Slash pine. 7. Longleaf pine. 8. Hard maple. 9. Blue beech. 10. Beech. 11. Mockernut. 12. Basket Oak. 13. Cork elm. 14. Canoe birch. 15. Pignut hickory. 16. Bur oak. 17. Black oak. 18. Shortleaf pine. 19. Soft maple. 20. Mahogany. 21. Red oak. 22. Red birch. 23. White oak. 24. Tamarack. 25. Lawson cypress. 26. Loblolly pine. 27. Douglas spruce. 28. Western white oak. 29. Post oak. 30. Red ash. 31. White ash. 32. Black walnut. 33. White elm. 34. Sour gum. 35. Wild black cherry. 36. Red maple. 37. Blue ash. 38. Black ash. 39. Norway pine. 40. Western red cedar. 41. Black spruce and Rod spruce. 42. White spruce. 43. Red cedar. 44. Hemlock. 45. Western yellow pine. 46. Chestnut. 47. Oregon maple. 48. Bald cypress. 49. Cucumber tree. 50. Oregon ash. 51. Yellow poplar. 52. Sweet gum. 53. Tideland spruce. 54. Sycamore. 55. White pine. 56. Western white pi no. 57. Butternut. 58. Redwood. 59. Sugar pine. 60. Basswood. 61. Engelmann's spruce. 62. Grand fir. 63. Big tree. 64. White cedar. 65. Black willow. 19-4 WOOD AND FOREST. LIST OF 66 COMMON WOODS ARRANGED IN THE ORDER OF THEIR ELASTICITY. 1. Western larch. 2. Canoe birch and Yellow birch 3. Slash pine. 4. Longleaf pine. 5. Hard maple. 6. Cherry birch. 7. Shortleaf pine. 8. Shellbark hickory. 9. Black locust. 10. Douglas spruce. 11. Tamarack. 12. Lawson cypress. 13. Beech. 14. Mockernut. 15. Blue beech. 16. Norway pine. 17. Loblolly pine. 18. Red oak. 19. Red birch. 20. Soft maple. 21. Red spruce and Black spruce. 22. Cork elm. 23. Black walnut. 24. Mahogany. 25. Black oak. 26. Western red cedar. 27. Pignut hickory. 28. Bald cypress. 29. White spruce. 30. White ash. 31. Tideland spruce. 32. White oak. 33. Basket oak. 34. Grand fir. 35. Western white pine. 36. Red maple. 37. Bur oak. 38. Cucumber tree. 39. Yellow poplar. 40. Hemlock. 41. Western yellow pine. 42. Black ash. 43. Sycamore. 44. Sweet gum. 45. Wild black cherry. 46. Chestnut. 47. White pine. 48. Oregon ash. 49. Bass. 50. Post oak. 51. Sour gum. 52. Butternut. 53. Red ash. 54. Western white oak. 55. Engelmann's spruce. 56. Sugar pine. 57. Oregon maple. 58. Blue ash. 59. White elm. 60. Redwood. 61. Red cedar. 62. Big tree. 63. White cedar. 64. Black willow. SPECIES OF WOODS. 195 LIST OF 66 COMMON WOODS ARRANGED IN THE ORDER OF THEIR HARDNESS. 1. Mahogany. 2. Pignut. 3. Mockernut. 4. Post oak. 5. Shellbark hickory. 6. Black locust. 7. Hard maple. 8. "Western white oak. 9. Bur oak. 10. Basket oak. 11. Cherry birch. 12. Blue ash. 13. White oak. 14. Blue beech. 15. Cork elm. 16. Wild black cherry. 17. Red ash. 18. Black oak. 19. White ash. 20. Sour gum. 21. Black walnut. 22. Beech. 23. Black ash. 24. Slash pine. 25. Soft maple 26. Eed oak. 27. Red maple. 28. White elm. 29. Oregon ash. 30. Sycamore. 31. Oregon maple. 32. Yellow birch. 33. Long leaf pine. 34. Red cedar. 35. Western larch. 36. Sweet gum. 37. Red birch. 38. Short leaf pine. 39. Canoe birch. 40. Tamarack. 41. Cucumber tree. 42. Western yellow pine. 43. Loblolly pine. 44. Chestnut. 45. Douglas spruce. 46. Black willow. 47. Butternut. 48. Norway pine. 49. Yellow poplar. 50. Lawson cypress. 51. Hemlock. 52. Bald cypress. 53. Sugar pine. 54. Red spruce and Black spruce. 55. Redwood. 56. Engelmann's spruce. 57. White pine. 58. White spruce. 59. Tideland spruce. 60. Western white cedar. 61. Big tree. 62. White cedar. 63. Western white pine. 64. Basswood. 65. Grand fir. 196 WOOD AND FOREST. THE PRINCIPAL SPECIES OF WOODS. REFERENCES : * Sargent, Jesup Collection. Sargent, Manual. Britton. Roth, Timber. Hough, Handbook. Keeler. Apgar. Mohr. For. Bull., No. 22. Fernow, Forestry Investigations. Lumber Trade Journals. Baterden. Sargent, Silva. Sargent, Forest Trees, 10th Census, Vol. IX. Boulger. Hough, American Woods. Snow. Lounsberry. Spaulding. For. Butt. No. 13. Sudworth. For Bull No 17. Forest Service Records of Wholesale Prices of Lumber, List. A. For particular trees consult For. Serv., Bulletins and Circulars. See For. Service Classified List of Publications. For general bibliography, see p. 4. CHAPTER IV. THE DISTEIBUTION AND COMPOSITION OF THE NOETH AMEEICAN FOEESTS. The forests of the United States, Map, Fig. 44, may be conveni- ently divided into two great regions, the Eastern or Atlantic Forest, and the Western or Pacific Forest. These are separated by the great treeless plains which are west of the Mississippi Eiver, and east of the Eocky Mountains, and which extend from North Dakota to west- ern Texas. 1 The Eastern Forest once consisted of an almost unbroken mass, lying in three quite distinct regions, (1) the northern belt of coni- fers, (2) the southern belt of conifer?, and (3) the great deciduous (hardwood) forest lying between these two. (1) The northern belt of conifers or "North Woods'' extended thru northern New England and New York and ran south along the Appalachians. It reappeared again in northern Michigan, Wiscon- sin and Minnesota. White pine, Fig. 45, was the characteristic tree in the eastern part of this belt, tho spruce was common, Fig. 56, p. 213, and white and Norway pine and hemlock distinguished it in the western part. Altho the more valuable timber, especially the pine, has been cut out, it still remains a largely unbroken forest mainly of spruce, second growth pine, hemlock and some hardwood. (2) The southern pine forest formerly extended from the Poto- mac Eiver in a belt from one to two hundred miles wide along the Atlantic coast, across the Florida peninsula, and along the gulf of 1 ORIGINAL FOREST UEHIDXS OF THE UNITED STATES. Area Area Thousand acres Percent Northern forest 158.938 8.4 Hardwood forest 328,183 17.3 Southern forest 249.660 13.1 Rocky Mountains forest 155,014 8.1 Pacific forest 121,356 6.4 Treeless area . ..887,787 46.7 Total land area 1,900,947 100.0 197 198 WOOD AND FOREST. FOREST DISTRIBUTION AND COMPOSITION. 199 Fig. 45. Interior of Dense White Pine Forest, Cass Lake, Minn. U. S, Forest Service. 200 WOOD AND FOREST. Fig. 46. Long-leaf Pine Forest. Oscilla, Georgia. U. S. Forest Service. FOREST DISTRIBUTION AND COMPOSITION. 201 Mexico, skipping the Mississippi Eiver and reappearing in a great forest in Louisiana and Eastern Texas. It was composed of almost Fig-. 47. Semi-tropical Forest, Florida Live Oak, Surrounded by Cabbag-e Palmetto, and Hung- With Spanish Moss. U. S. Forest Service. pure stands of pine, the long-leaf, Fig. 46, the short-leaf, and the lob- lolly, with cypress in the swamps and bottom lands. In southern 202 WOOD AND FOREST. Florida the forest is tropical, Fig. 47, like that of the West Indies, and in southern Texas it partakes of the character of the Mexican forest. (3) Between these north and south coniferous belts, lay the great broad-leaf or hardwood forest, Fig. 48, which constituted the greater Fig-. 4?. Broad-leaf Forest, Protected from Cattle and Fire. Hancock Co., Indiana. U. S. Forest Service. FOREST DISTRIBUTION AND COMPOSITION. 203 204 WOOD AND FOREST. part of the Eastern Forest and characterized it. It was divided into two parts by an irregular northeast and southwest line, running from southern New England to Missouri. The southeast portion consisted of hardwoods intermixed with conifers. The higher ridges of the Appalachian Eange, really a leg of the northern forest, were occupied by conifers, mainly spruce, white pine, and hemlock. The northwest portion of the region, particularly Ohio, Indiana, and Illinois, was without the conifers. It was essentially a mixed forest, largely oak, with a variable mixture of maples, beech, chestnut, yellow poplar, hickory, sycamore, elm, and ash, with birch appearing toward the north and pine toward the south. Taking the Eastern Forest as a whole, its most distinguishing feature was the prevalence of broad-leaved trees, so that it might properly be called a deciduous forest. The greatest diversity of trees was to be found in Kentucky, Tennessee and North Carolina, and this region is still the source of the best hardwood lumber. This great eastern forest, which once extended uninterruptedly from the Atlantic to" the Mississippi and beyond, has now been largely lumbered off, particularly thru the middle or hardwood portion, mak- ing way for farms and towns. The north and south coniferous belts are still mainly unbroken, and are sparsely settled, but the big timber is cut out, giving place to poorer trees. This is particularly true of the white pine, "the king of American trees," only a little of which, in valuable sizes, is left in Michigan, Wisconsin and Minnesota. In the same way in the south, the long-leaf pine, once the characteristic tree, is fast being lumbered out. The Western or Pacific forest extends two great legs, one down the Rocky Mountain Eange, and the other along the Pacific coast. Between them lies the great treeless alkali plain centering around Nevada, Fig. 49. In these two regions coniferous trees have almost a monopoly. Broad-leaved trees are to be found there, along the river beds and in ravines, but they are of comparatively little importance. The forest is essentially an evergreen forest. Another marked feature of this western forest, except in the Puget Sound region, is that the trees, in many cases, stand far apart, their crowns not even touching, so that the sun beats clown and dries up the forest floor, Fig. 50. There is no dense "forest cover" or canopy as in the Eastern Forest. Moreover these western forests are largely broken up, covering but a part of the mountains, many of which are snow-clad, and interrupted FOREST DISTRIBUTION" AND COMPOSITION. 205 by bare plains. Along the creeks there grow a variety of hardwoods. It was never a continuous forest as was the Eastern Forest. The open- ness of this forest on the Rockies and on the eastern slopes of the Sierra Nevadas is in marked contrast to the western slopes of the Sierras, where there are to be seen the densest and most remarkable woods of the world, Fig. 51. This is due to the peculiar distribution of the rainfall of the region. The precipitation of the moisture upon the northwest coast where the trees are dripping with fog a large Fig. 50. Open Western Forest, Bull Pine. Flag-staff, Arizona. U, S. Forest Service. part of the time, is unequaled by that of any other locality on the continent. But the interior of this region, which is shut off by the high Sierra Nevadas from the western winds, has a very light and irregular rainfall. Where the rainfall is heavy, the forests are dense; and where the rainfall is light, the trees are sparse. Along the Eockies the characteristic trees are Engelmann's spruce, bull pine, Douglas fir, and lodgepole pine. As one goes west, the variety of trees increases and becomes, so far as conifers are concerned, far greater than in the east. Of 109 conifers in the United States,. 206 WOOD AND FOREST. 80 belong to the western forests and 28 to the eastern. The Pacific forest is rich in the possession of half a dozen leading species Doug- las fir, western hemlock, sugar pine, bull pine, cedar and redwood. Fig. 51. Dense Forest of Puget Sound Reg-ion, Red Fir and Red Cedar. Pierce Co., Washing-ton. U. S. Forest Service. But the far western conifers are remarkable, not only for their variety, but still more for the density of their growth, already men- tioned, and for their great size, Fig. 52. The pines, spruces and hemlocks of the Puget Sound region make eastern trees look small, FOREST DISTRIBUTION AND COMPOSITION. 207 and both the red fir and the redwood often grow to be over 250 feet high, and yield 100,000 feet, B.M., to the acre as against 10,000 feet, B.M., of good spruce in Maine. The redwood, Fig. 53, occupies a Fig-. 52. Virgin Forest of Red Fir, Red Cedar, Western Hemlock, and Oregon Maple. Ashford, Washing-ton. U. S. Forest Service. belt some twenty miles wide along the coast from southern Oregon to a point not far north of San Francisco and grows even taller than the famous big trees. The big trees are the largest known trees in diam- eter, occasionally reaching in that measurement 35 feet. 208 WOOD AXU FOREST. The big tree, Fig. 54, occurs exclusively in groves, which, however, are not pure, but are scattered among a much larger number of trees of other kinds. . 53. Redwood Forest. Santa Cruz Co., Calif. U, S. Forest Service. The great and unsurpassed Puget Sound forest is destined to be before long the center of the lumber trade of this country. These two great forests of the east and the west both run north- ward into British America, and are there united in a broad belt of FOREST DISTRIBUTION AXD COMPOSITION. 209 subarctic forest which extends across the continent. At the far north it is characterized by the white spruce and aspen. The forest is open, stunted, and of no economic value. Taking all the genera and species together, there is a far greater variety in the eastern than in the western forests. A considerable number of genera, perhaps a third of the total, grow within both regions, but the species having continental range are few. They are 210 WOOD AND FOREST. the following : Larch (Larix laricina), white spruce (Picea canaden- sis), dwarf juniper (Juniperus communis), black willow (Salix nigra), almond leaf willow (Salix amygdaloides), long leaf willow (Salix fluviatilis) , aspen (Populus tremuloides) , balm of Gilead (Populus balsamifera) , and hackberry (Celtis occidentalis) . THE DISTRIBUTION AND COMPOSITION OF NORTH AMERICAN FORESTS. REFERENCES : * Sargent, Forest Trees. Intro, pp. Shaler, I, pp. 489-498. 3-10. Fernow, For. Inves., pp. 45-51. Bruncken, pp. 5-16. Fernow, Economics, pp. 331-308. Roth, First Book, pp. 209-212. *For general bibliography, see p. 4. ClIAl'lER V. THE FOREST OBGANISM. The forest is much more than an assemblage of different trees, it is an organism; that is, the trees that compose it have a vital rela- tion to each other. It may almost be said to have a life of its own, since it has a soil and a climate, largely of its own making. Without these conditions, and without the help and hindrance which forest trees give to each other, these trees would not have their present characteristics, either in shape, habits of growth or nature of wood grain. Indeed, some of them could not live at all. Since by far the greater number of timber trees grow in the for- est, in order to understand the facts about trees and woods, it is neces- sary to know something about the conditions of forest life. A tree is made up of three distinct parts: (1) the roots which anchor it in the ground, and draw its nourishment from the moist soil; (2) the trunk, or bole, or stem, which carries the weight of the branches and leaves, and conveys the nourishment to and from the leaves; (3) the crown, composed of the leaves, the branches on which they hang, and the buds at the ends of the branches. As trees stand together in the forest, their united crowns make a soit of canopy or cover, Fig. 55, which, more than anything, determines the factors affecting forest life, viz., the soil, the temperature, the moisture, and most important of all, the light. On the other hand, every species of tree has its own requirements in respect to these very factors of temperature, moisture, soil and light. These are called its silvical characteris'ics. SOIL. Some trees, as black walnut, flourish on good soil, supplanting others because they are better able to make use of the richness of the soil; while some trees occupy poor soil because they alone are able to live there at all. Spruce, Fig. 56, will grow in the north woods on such poor soil that it has no competitors, and birches, too, will grow 211 212 WOOD AXD FOREST. Fig-. 55. The Forest Cover. Spruce Forest, Bavaria, Germany. U. S. Forest Service. THE FOREST ORGANISM. 213 anywhere in the north woods. In general, it is true that mixed for- ests, Fig. 57, i. e., those having a variety of species, grow on good loamy soil. The great central, deciduous Atlantic Forest grew on such soil until it was removed to make room for farms. On the other hand, pure stands i. e., forests made up of single varieties of pine occupy poor sandy soil. Within a distance of a few yards in the midst of a pure stand of pine in the south, a change in the soil will produce a dense mixed growth of broad-leaves and coni- fers. The soil in the for- est is largely deter- mined by the forest it- self. In addition to the earth, it is com- posed of the fallen and decayed leaves and twigs and tree trunks, altogether called the forest floor. It is spongy and hence has the ability to retain moisture, a fact of great importance to tllO forest. Fi ff- 56 - Virgin Stand of Red Spruce. White Mountains, New Hampshire. U. S, Forest Service. MOISTURE. Some trees, as black ash and cypress, Fig. 58, and cotton gum, Fig. 59, grow naturally only in moist places; some, as the pinon and mesquite, a kind of locust, grow only in dry places; while others, as the jumper and Douglas fir, adapt themselves to either. Both excess- ively wet and dry soils tend to diminish the number of kinds of trees. In many instances the demand for water controls the distribution alto- gether. In the Puget Sound region, where there is a heavy rain-fall, the densest forests in the world are found, whereas on the eastern slopes of the same mountains, altho the soil is not essentially different, there are very few trees, because of the constant drouth. 214 WOOD AND FOREST. TEMPERATURE. The fact that some trees, as paper birch and white spruce, grow only in cold regions, and some, as rubber trees and cypress, only in the tropics, is commonplace ; but a fact not so well known is that it is not the average temperature, but the extremes which largely deter- Fig-. 57. Typical Mixed Forest, Red Spruce, Hemlock, White Ash, Yellow Birch, Balsam Fir, and Red Maple. Raquette Lake, New York. U. S. Forest Service. mine the habitat of trees of different kinds. Trees which would not live at all where there is frost, might flourish well in a region where the average temperature was considerably lower. On the other hand, provided the growing season is long enough for the species, there is no place on earth too cold for trees to live. Fig. GO. THE FOREST ORGANISM. 215 Fig-. 58. Cypress and Cypress "Knees." Jasper Co., Texas. U. S. Forest Service, Fig-. 59. Cotton Ciums, Showing- Buttresses. St. Francis River, Arkansas. U. S, Forest Service, 216 WOOD AND FOREST. In general, cold affects the forest just as poor soil and drought do, simplifying its composition and stunting its growth. In Canada there are only a few kinds of trees, of which the hardwoods are stunted ; south of the Great Lakes, there is a great variety of large trees; farther south in the southern Appalachian region, there is a still greater variety, and the trees are just as large ; and still farther south in tropical Florida, there is the greatest variety of all. The slopes of a high moun- tain furnish an illustration of the effect of temperature. In ascending it, one may pass from a tropical forest at the base, thru a belt of evergreen, broad-leaved trees, then thru a belt of de- ciduous broad-leaved trees, then thru a belt of conifers and up to the timber line where tree life ceases. Figs. 61, and 62. LIGHT. More than by any other factor, the growth of trees in a forest is determined by the effect of light. All trees need light sooner or later, but some trees have much more ability than others to grow in the shade when young. Such trees, of which maple and spruce are examples, are called tolerant, while others, for in- stance, larch, which will endure only a comparatively thin cover or none at all, are called intolerant. The leaves of to^rant trees endure shade well, so that their inner and lower leaves flourish under the shadow of their upper and outer leaves, with the result that the whole tree, as beech and maple, makes a dense shadow; whereas the leaves of intolerant trees are either sparse, as in the larch, or are so hung that the light sifts thru them, as in poplar and oak. The spruces and Fig-. 60. Northern Forest, Young- Spruce Growing- Under Yellow Birch. Santa Clara, New York. U. S. Forest Service. THE FOREST ORGANISM. 217 Fig. 61. Mixed Hardwoods on Lower Levels. Spruce and Balsam Dominate on Higher Elevations. Mt. Mclntyre, Adirondack Mountains, New York. U. S. Forest Service. Fig. 62 Scrub Growth on Mountain Top. Mt. Webster, New Hampshire. U. S. Forest Serzice. 218 WOOD AND FOREST. balsam fir have the remarkable power of growing slowly under heavy shade for many years, and then of growing vigorously when the light is let in by the fall of their overshadowing neighbors. This can plainly be seen in the cross-section of balsam fir, Fig. 63, where the narrow annual rings of the early growth, are followed by the wider ones of later growth. A common sight in the dense woods is the maple sending up a long, spindly stem thru the trees about it and having at its top a lit- tle tuft of leaves, Fig. 64. By so doing it- survives. The fact that a tree can grow with- out shade often deter- mines its possession of a burnt-over tract. The order in the Xorth Woods after a fire is commonly , first, a growth of fire weed, then -raspberries or blackberries, then as- pen, a very intolerant tree whose light shade in turn permits under it the growth of the spruce, to which it is a "nurse," Fig. 65. In general it may be said that all seedling conifers require some shade the first two years, while hardwoods in temperate climates, as a rule, do not. .^: This matter of tolerance has also much to do with the branching of trees. The leaves on the lower branches of an intolerant tree will not thrive, with the result that those branches die and later drop off. This is called "cleaning," or natural pruning. Intolerant trees, like aspen and tulip, Fig. 66, clean themselves well and- hence grow with long, straight boles, while tolerant trees, like spruce and fir, retain their branches longer. The distribution of a species may also be determined by geograph- ical barriers, like mountain ranges and oceans. This is why the Fig-. 63. Cross-section of Balsam Fir, Showing- Fast Growth After Years of Suppression. Notice the width of the annual ring's in later age compared with early. U. S. Forest Service. THE FOREST ORGANISM. 219 Fig. 64. Tolerant Maple. The trees are too slender to stand alone. U. S. Forest Service. Fig-. 65. Intolerant Aspen, a "nurse" of Tolerant Spruce. U. S. Forest Service. 220 WOOD AND FOREST. western forests differ radically from the eastern forests and why the forest of Australasia is sharply distinct from any other forest in the world. Any one or several of these factors, soil, moisture, heat, and light, may be the determining factor in the make-up of a forest, or it may be that a particular tree may survive, because of a faster rate of growth, thus enabling it to overtop its fellows and cut off their light. The struggle for survival is constant, and that tree survives which can take the best advantage of the existent conditions. Besides these topographical and climatic factors which help deter- mine the distribution of trees, a very important factor is the historical one. For example, the only reason by which the location of the few isolated groves of big trees in California can be accounted for is the rise and fall of glacial sheets, which left them, as it were, islands stranded in a sea of ice. As the glaciers retreated, the region gradu- ally became re-forested, those trees coming up first which were best able to take advantage of the conditions, whether due to the character of their seeds, their tolerance, their endurance of moisture or what- ever. This process is still going on and hardwoods are probably gain- ing ground. Besides these external factors which determine the composition and organic life of the forest, the trees themselves furnish an impor- tant factor in their methods of reproduction. These, in general, are two, (1) by sprouts, and (2) by seeds. (1) Most conifers have no power of sprouting. The chief ex- ceptions are pitch pine and, to a remarkable degree, the redwood, Fig. 67. This power, however, is common in broad-leaved trees, as may be seen after a fire has swept thru second growth, hardwood timber. Alfho all the young trees are killed down to the ground, the young sprouts spring up from the still living roots. This may hap- pen repeatedly. Coppice woods, as of chestnut and oak, which sprout with great freedom, are the result of this ability. The wood is poor so that it is chiefly used for fuel. (2) Most trees, however, are reproduced by seeds. Trees yield these in great abundance, to provide for waste, nature's method. Many seeds never ripen, many perish, many are eaten by animals, many fall on barren ground or rocks, and many sprout, only to die. The weight of seeds has much to do with their distribution. Heavy seeds like acorns, chestnuts, hickory and other nuts, grow where they THE FOREST ORGANISM. 221 Fig-. 66. Intolerant Tulip. Notice the long-, straight boles. U. S. Forest Service. 222 WOOD AND FOREST. fall, unless carried down hill by gravity or by water, or scattered by birds and squirrels. Trees with winged seeds, however, Fig. 68, as bass, maple and pine, or with light seeds, as poplar, often have their seeds carried by the wind to great distances. Again some trees, as spruce, are very fertile, while others, like beech, have only occasional seed-bearing seasons, once in three or Fig. 67. Sprouting- Redwood Stumps. Glen Blair, Calif. U. S. Forest Service. four years. Willow seeds lose their power of germination in a few days, and hence, unless they soon reach ground where there is plenty of moisture, they die. This is why they grow mostly along water courses. On the other hand, black locust pods and the cones of some pines keep their seeds perfect for many years, often until a fire bursts them open, and so they live at the expense of their competitors. THE FOREST ORGANISM. 223 Fig-. 68. Winged Seeds. 1, Bass wood; 2, Box-elder; 3, Elm; 4, Fir; 5,6,7,8, Pines. U. S. Forest Service. It is such facts as these that help to account for some of the facts of forest composition, why in one place at one time there is a growth of aspens, at another time pines, at still an- other oaks; and why beeches spring up one year and not an- other. That red cedars grow in avenues along fences, is ex- plained by the fact that the seeds are dropped there by birds, Fig. 69. The fact that conifers, as the longleaf pine, Fig. 46, p. 200, and spruce, Fig. 55, p. 212, are more apt to grow in pure stands than broad-leaved trees, is largely accounted for by their winged seeds; whereas the broad-leaved trees grow mostly in mixed stands because their heavy seeds are not plenti- tifully and widely scattered. This is a rule not without exceptions, for beech sometimes covers a whole mountain side, as Slide Mountain in the Catskills, and aspens come in over a wide area after a fire; but later other trees creep in until at length it becomes a mixed forest. The essential facts of the relation of trees to each other in the forest has been clearly stated by Gifford Pinchot thus :* The history of the life of a forest is a story of the help and harm which trees receive from one another. On one side every tree is engaged in a re- Fig-. 69. Red Cedar Avenue. Seeds dropped by birds which perched on the fences. Indiana. U. S. Forest Service. 1 Gifford Pinchot, Primer of Forestry, p. 44. 224 WOOD AND FOREST. lentless struggle against its neighbors for light, water and food, the three things trees need most. On the other side each tree is constantly working with all its neighbors, even those which stand at some distance, to bring about the best condition of the soil and air for the growth and fighting power ^f every other tree. The trees in a forest help each other by enriching the soil in which they stand with their fallen leaves and twigs, which are not quickly blown or washed away as are those under a tree in the open. This collection of "duff" or "the forest floor" retains the moisture about their roots, and this moist mass tends to keep the temperature of the forest warmer in winter and cooler in summer. The forest cover, Fig. 55, p. 212, consisting largely of foliage, has the same effect, . 70. Shallow Roots of Hemlock. Bronx Park, New York, N. Y. and in addition protects the bark, the roots, and the seedlings of the trees from the direct and continuous hot rays of the sun. Without the shade of the leaves, many trees, as white pine, would quickly die, as may readily be seen by transplanting them to the open. The mass of standing trees tempers the force of the wind, which might over- throw some of them, and hinders the drying up of the duff. But trees hinder as well as help each other. There is a constant struggle between them for nourishment and light. To get food and water, some trees, as spruces and hemlocks, Fig. 70, spread their roots out flat; others, as oak and pine, send down a deep tap root. Those succeed in any environment that find the nourishment they need. Still more evident is the struggle for light and air. However well a THE FOREST ORGANISM. 225 tree is nourished thru its roots, unless its leaves have an abundance of light and air it will not thrive and make wood. Even the trees most tolerant of shade in youth, like spruce, must have light later or perish, and hence in a forest there is the constant upward reach. This produces the characteristic "long-bodied" trunk of the forest tree, Fig. 71, in contrast to the "short-bodied" tree of the open, where the branches reach out in all direc- tions, Fig. 72. In this constant struggle for existence is involved the persistent attempt of scat- tered seeds to sprout whenever there is an opening. The result is that a typical forest is one in which all sizes and ages of trees grow together. Scattered among these are bushes and scrubby trees, called "forest weeds," such as mountain maple and dogwood, Fig. 80, p. 234, which do not produce timber. By foresters the trees them- selves are classified according to their size into : Seedlings, less than 3' high, Saplings, Small, 3'-10' high. Large, 4" in diameter, at breast height (4' 6"). Poles, Small, 4"-8" in diameter, at breast height. Large, 8"-12" in diameter, at breast height. Standards, l'-2' in diameter, at breast height. Veterans, over 2' in diameter at breast height. Fig. 71. Long- bodied White Oak of the Forest. U. S. Forest Service. 226 WOOD AND FOREST. Every age has its own dangers. Many seeds never germinate, many seedlings perish because they do not reach soil, or are killed by too much or too little moisture, or by heat or cold, or shade. At the sapling age, the side branches begin to interfere with those of other saplings. Buds are bruised and lower branches broken by thrashing in the wind, and their leaves have less light. Only the upper branches have room and light, and they flourish at the expense of lower ones, which gradually die and are thus pruned off. Some trees naturally grow faster than others, and they attain additional light and room to spread laterally, thus overtop- ping others which are sup- pressed and finally killed, beaten in the race for life. If the growth should re- main about even so that the trees grew densely packed to- gether, the whole group would be likely to be of a poorer qual- ity, but ordinarily the few out- grow the many and they are called dominant trees. Even then, they still have to struggle against their neighbors, and at this, the large sapling stage, many perish, and of those that survive there are great differ- ences in size. Trees make their most rapid growth in height, and lay on the widest yearly "rings," at the large sapling and small pole age, Fig. 114, p. 263. It is at this stage, too, if the growth is at all dense, that the young trees (poles) clean themselves most thoroly of their branches. The growth in diameter continues to the end of the tree's life, long after the height growth has ceased. When trees become "standards," and reach the limit of height growth, thru their inability to raise water to their tops, their branches must perforce grow sidewise, or not at all. The struggle for life thus takes a new form. How trees are able to raise water as high as they do is still un- explained, but we know that the chief reason why some trees grow Jngv74. oiiort- bodied w hite Oak of the Open. Fort Lee, N. J. THE FOREST ORGANISM. 227 taller than others, is due to their ability to raise water. The most remarkable in this respect are the California redwoods, the big trees, and certain eucalypts in Australia. This inability of trees to grow above a certain height results in a flattening of the crown, Fig. 73, and at this stage, the trees struggle against each other by crowding at the side. Inasmuch as trees grow more sen- sitive to shade with advancing age, the taller trees have the advantage. Each survivor is one of a thousand, and has outlived the others because it is best fitted for the place. This fact has its effect upon the next generation, because it is these dominant surviving trees which bear seed most abundantly. After the tree has finished growing in height and diameter most vigorously the pole stage and proved to be fitted for the place, its energy is largely spent in raising seed. As this process goes on generation after genera- tion, only the best coming to maturity in each, the poorer sorts are sifted out, and each region and continent has those species best fitted to meet the con- ditions of life there. This is the reason why exotics are very likely to be sensitive and perhaps succumb to influences to which native trees are immune. Standards and veterans are the sur- vivors of all the lower stages, each of which has had its especial dangers. If left alone, the tree gradually dies and at last falls and decays, adding somewhat to the fertility of the forest soil. From the point of view of human use, it would far better have been cut when ripe and turned into lumber. It is a mistake to r. 73. Flattened Crown of Red Pine. U.S. Forest Service. 228 WOOD AND FOREST. suppose that the natural virgin forest is the best possible forest, and that it should therefore be left alone. In the National Forests the ripe lumber is sold and a considerable revenue is thus available. But nature's way with the dead tree is to use it to produce more life. How she does so will be explained in the next chapter, on the enemies of the forest. THE FOREST ORGANISM. REFERENCES : * Pinchot, For. Bull. No. 24, I, pp. 25-G6. Bruncken, pp. 13-31 For. Circ. No. 36, p. 8. Fernow, Economics, pp. 140-164. *For general bibliography, see p. 4. CHAPTER VI. NATURAL ENEMIES OF THE FOREST. The natural enemies of the forest as distinct from its human enemies fall into three groups: (1) Meteorological, (2) Vege- table, (3) Animal. METEOROLOGICAL FORCES. Wind. ''Windfalls" are not an uncommon sight in any forest. Frequently only small areas arc blown down, one large tree upsetting a few others, or again a vast region is destroyed by great storms, Fig-. 74. Effect of Wind, July , 1902, Cass County, Minnesota. U. S. Forest Service, tig.. 74. An area of many square miles in Florida covered with long-leaf pine was thus destroyed several years ago. The "slash" thus formed, when well dried, is particularly liable to catch fire and burn furiously. Windfalls are especially common among shallow- Booted trees, as hemlock, basswood and spruce, on sandy soil and on 229 230 WOOD AND FOREST Fig. 75. Sand-dunes, Cape May, New Jersey. U.S. Forest Service. Fig-. 76. Sand-dune. Oregon. U.S. Forest Service. NATURAL ENEMIES OF THE FOREST. 231 shallow soil underlaid with solid stone, especially where open spaces give the wind free sweep. It follows that an unbroken forest is a great protection to itself. The only precautions against wind there- fore, that can be taken by the forester, are to keep the forest unbro- ken by selecting only the larger trees for felling or to cut down a given tract by beginning at the side opposite the direction of pre- vailing storms and working toward them. In sandy regions, the wind does immense harm by blowing the sand to and fro in constantly shifting dunes, Figs. 75 and 76. These dunes occupy long stretches of the Atlantic coast and the shore of Lake Michigan. Such dunes have been estimated to cover 20,000 square miles of Europe. Along the Bay of Biscay in France, the sand dunes formerly drifted in ridges along the shore, damming up the streams and converting what was once a forest into a pestilential marsh. This region has been reclaimed at great expense by building fences along the shore to break the wind and thus keep the moving sand within limits. In this way a million acres of productive forest have been obtained. On the other hand winds are beneficial to the forest in scattering seeds, weeding out weak trees, and developing strength in tree trunks. Drouth both injures the foliage of trees and causes defects in the grain of wood, the latter appearing as "false rings." These arise from the effort of the tree to resume growth when the water supply is re- stored. See p. 19. Water. Cer- tain trees have become accus- tomed tO living Fijr. 77. , Effect of Flooding. First Cotin^cticuT in much Water Lake, New Hampshire. 17. S. forest Service. as cedar and cypress have in swamps, and certain trees have become accustomed to periodical floods, but other trees are killed by much water. So when lumbermen make a pond which overflows forest land, the trees soon die, Fig. 77. Lightning frequently blasts single trees, and in dry seasons may set fire to forests. This is a much more important factor in the west 232 WOOD AND FOREST. than in the east, in the Rockies, for instance, where there are elec- trical storms without rain. Fires will be considered later under man's relation to the forest. Snow and ice often bring serious harm to saplings by perma- nently bending them over, Fig. 78, or by breaking off tops and branches. Frost kills young plants; and sudden changes in temperature seriously affect grown timber, producing "frost checks" and "wind Fig-. 78. Slim Trees Kent Over by Snow; Stouter Trees Unharmed. Zurich, Switzerland. U. S. Forest Service. shakes." When there is a sudden fall in temperature, the outside layers of the tree, which are full of sap, contract more rapidly than the inner portions, with the result that the tree splits with a sudden pistol-like report, the check running radially up and down the tree. This is called a "frost check" or "star shake," Fig. 41.a, p. 47, and such wounds rarely heal, Fig. 79. On the other hand when the temperature rapidly rises, the outside layers of the tree expand so much more rapidly than the inside, that they separate with a dull muffled chug, the check extending in a cir- NATURAL ENEMIES OF THE FOREST. 233 cular direction following the annual rings. Such checks are often called "wind shakes" and "cup shakes/' Fig. 41. c, p. 47. These in- juries are found in regions where sudden changes of temperature occur, rather than in the tropics or in very cold climates. VEGETABLE ENEMIES. Under this head may be classed., in addition to fungi, a number of unrelated plants, including such as: moosewood and dogwood,, Fig. 80, which crowd out young trees; vines, like bitter-sweet, which wind about trees and often choke them by pressure, cutting thru the bark and cambium ; sapro- phytes, which smother the foli- age of trees, of which Spanish moss, Fig. 47, p. 201, is an ex- ample; and finally such para- sites as the mistletoes, which weaken and deform the trees. The most important of the vegetable enemies of trees are fungi. It should be remembered, however, that, without the decay produced by them, the fallen trees would soon cover the ground, and prevent any new growth, thus destroying the natural forest. Every tree, as has been noted (p. 17), is composed of two parts, one part, including leaves, young branches, roots and sap-wood, living, and the other part, namely, the heart-wood, practically dead. Fungi that attack the live parts of a tree are called parasites, while those that live on dead trunks and branches are designated as saprophytes. The line, however, between these two classes of fungi is not well defined, since some parasites live on both living and dead wood. The parasites are of first importance, for, since they kill many wees, they control to a large extent the supply of living timber. Fig-. 79. Contraction Frost Check. U. S. Forest Se.rnce* 234 WOOD AND FOREST. Nearly all parasitic fungi have two portions, an external fruiting portion which bears the spores which correspond to the seeds of flowering plants and an internal portion consisting of a tangle of threads or filaments, which ramify the tissues of the tree and whose function is to absorb nutriment for the fungus. Fungi are classified botanically according to the spore-bearing bodies, their form, color, etc. The parasitic fungi which are especially destructive to wood are those that have naked spores growing on exposed fruiting surfaces (the Hymenomycetes) . In toadstools (the agarics) these exposed surfaces are thin, flat plates called gills. In the polypores, which in- clude the shelf fungi, the spore surfaces are tubes whose open- ings constitute the pores. In the dry-rot, or tear fungus (Me- rulius lacrymans), the spore surfaces are shallow cavities. Some varieties, called true parasites, develop in uninjured trees, while others, called wound parasites, can penetrate the tissues of trees, only where a cut or injury makes a suit- able lodgment for the spores. Some fungi attack only a sin- gle species of trees, others whole genera; some attack only conifers, others decidu- ous trees, while a few attack trees of nearly all kinds alike. Fgal spores when brought in contact with a wound on a tree or other suitable place, and provided with suitable conditions of growth, germinate, penetrate the tissues and grow very rapidly. These spores send out long threads or filaments which run thru the cells lengthwise and also pierce them in all directions, soon forming a network in the wood called the mycelium. Hotting, in a large number of cases, is due to the ravages of fungi. This sometimes shows in the color, as the "red rot" of pine or the "bluing" of ash. Sometimes as in "pecky" or "peggy" cypress, NATURAL ENEMIES OF THE FOREST. 235 the decayed tracts are tubular. More commonly the decayed parts are of irregular shape. The decay of wood is due to the ravages of low forms of plant life, both bacteria and fungi. A few of the more destructive forms may be noted. Trametes pini (Brot.) Fr. Foremost among the timber de- stroying fungi is the large brown "punk" or "conch" found in its typical development on the long- leaf and short-leaf pines, Pinus palustris and Pinus echinata, Fig. 81. The fruiting bodies form large masses which grow out from a knot, oftentimes as large as a child's head. They are cinnamon brown on the lower surface, and much fissured and broken, on the black charcoal-like upper surface. This fungus probably causes four- fifths of the destruction brought about by the timber destroying fungi. It occurs on most of the conifers in the United States which have any value as lumber J Fig-. 81. A "Conch," the fruiting body of trees, and brings about a charac- Trametes ///, on Sugar Pine. {Agr^c. teristic white spotting of the rear Book, , ^ Pi. XXII, Fig. 2.1 wood, Fig. 82, which varies with the kind of tree attacked. (Von Schrenk, Agric. Yr. Bk., 1900, p. 206.) **', I Fig-. 82. Effect ofJFung-us. (Trametes pint.} U.S.Dept. Agrtc 236 WOOD AND FOREST. Of the shelf fungi, which project like brackets from the stems of trees, and have their pores on their under surfaces, one of the com- monest in many localities is the yellow cheese-like Polyporus sulphu- reus, Fig. 83. This is found on oak, poplar, willow, larch, and other standing timber. Its spawnlike threads spread from any exposed portion of cambium into the pith-rays and between the annual rings, forming thick layers of yellow- ish-white felt, and penetrating the vessels of the wood, which thereupon becomes a deep brown color and decays. Of the umbrella-shaped gill-bearing fungi, a yellow toadstool, called the honey mushroom (Agaricus melleus], is a good example, Fig. 84. This fungus, of common occurrence in the United States as well as in Europe, is exceedingly destructive to coniferous trees, the white pine in particular suffering greatly from its attacks. It also fastens upon vari- ous deciduous species as a parasite, attack- ing living trees of all ages, but living as well upon dead roots and stumps and on wood that has been cut and worked up, occurring fre- quently on bridges, railroad ties, and the like, and causing prompt decay wherever it has effected an entrance. The most conspicu- ous part of the fungus is found frequently in the summer and fall on the diseased parts of the tree or umber infested by it. It is one of the common toadstools, this particular species being recognized by its yellowish color, gills extending downward upon the stem, which is encircled a little lower down by a ring, and by its habit of growing in tufts or little clumps of several or many individuals together. It is also particularly distinguished by the formation of slender, dark-colored strings, consisting of compact mycelium, from which the fruiting parts just described arise. These hard root-like strings (called rhizomorphs) extend along just beneath the sur- face of the ground, often a distance of several feet, and penetrate the roots of sound trees. By carefully removing the bark from a root thus invaded the fungus is seen in the form of a dense, nearly white, mass of mycelium, which, as the parts around decay, gradually produces again the rhizomorphs already described. These rhizomorphs are a characteristic part of the fungus. Occurring both in the decayed wood from which they spread to the adjacent parts, and extending in the soil from root to root, they constitute a most effective agency in the extension of the disease. Fig-. 83. "Shelf" Fungus on Pine. a. Sound wood;. Kesin- ous"ligtit" wo d; c. Partly de- cayed wood or punk; d. Leaver of living spore tubes * Old filled-up spore tubes; f. Flut- ed upper surface of the fruit- ing- body of the fungus, which g-ets its food thru a great number of fine threads (the mycelium), its vegetative tis- sue penetrating- the wood and causing its decay. [After Hartig.} NATURAL ENEMIES OF THE FOREST. 237 External symptoms, to be observed especially in young specimens re- cently attacked, consist in a change of the leaves to a pale sickly color and often the production of short stunted shoots. A still more marked symptom is the formation of great quantities of resin, which flow downward thru the injured parts and out into the ground. (Forestry Bulletin No. 22, p. 51.) Of the irregular shaped fungi, one of the most destructive is a true parasite, i. e. f one that finds lodgment without help, called Poly- porus annosus and also Trametes radiciperda, Fig. 85. It is peculiar in developing its fructifications on the exterior of roots, beneath the Fig-. 84. Honey Mushroom. Agancus melleus. 1. Cluster of small sporophores. 2. Larger sporophore with root-like organ of attachment. Forestry Bulletin 22. Plate XII, Figs. land 2. soil. Its pores appear on the upper side of the fructifications. It Attacks only conifers. Its spores, which can be readily conveyed in the fur of mice or other burrowing animals, germinate in the moisture around the roots: the fine threads of "spawn" penetrate the cortex, and spread thru and destroy the cambium, extending in thin, flat, fan-like, white, silky bands, andj here and there, bursting thru the cortex in white, oval cushions, on which the sub- terranean fructifications are produced. Each of these is a yellowish-white, felt-like mass, with its outer surface covered with crowded minute tubes or 238 WOOD AND FOREST. "pores" in which the spores are produced. The wood attacked by this fungus first becomes rosy or purple, then turns yellowish, and then exhibits minute black dots, which surround themselves with extending soft white patches. (Boulger, p. 73.) Of the fungi which attack converted timber, the most important is "dry rot" or "tear fungus" (Merulius lacJirymans] , Fig. 80. It J Fig. 85. 1. Stump of Norway Spruce, with a sporophoreof polyporus annosus several years old; the inner portions of the stump wholly decayed. 2,. Roots of a diseased spruce tree, with numerous small sporophores of polvporus annosus attached. Forestry Bulle- ttn 22, Plate XIII, Figs. 1 and 2. flourishes on damp wood in still air, especially around stables and ill ventilated cellars. It gets its name lachrymans (weeping) from its habit of dripping moisture. The fungus destroys the substance of the timber, lessening its weight and causing it to warp and crack; until at length it crumbles up when dry into a fine brown powder, or, readily absorbing any moisture in its neighbor- hood, becomes a soft, cheese-like mass. * * * Imperfectly seasoned tim- NATURAL ENEMIES OF THE FOREST. 239 her is most susceptible to dry rot: the fungus can be spread either by its spawn or by spores, and these latter can be carried even by the clothes or saws of workmen, and are, of course, only too likely to reach sound wood if diseased timber is left about near it; but on the other hand dry timber kept dry is proof against dry rot, and exposure to really dry air is fatal to the fungus. (Boulger, p. 75.) About all that can be done to protect the forest against fungi is to keep it clean, that is, to clear out fallen timber and slash, and in some cases to dig trenches around affected trees to prevent spreading or to cut them out and destroy them. Such methods have here- tofore been too expensive to em- ploy in any ordinary American forest, but the time is at hand when such action will prove profitable in many localities. For the preservation of cut timber from decay, several methods are used. Fungi need heat, air, moisture and food. If any one of these is lacking the fungus cannot grow. Air and heat are hard to exclude from wood, but moisture and food can be kept from fungi. The removal of moisture is called seasoning, and the poisoning of the food of fungi is a process of impregnating wood with certain chemicals. Both these processes are described in Handwork in Wood, Chapter III. F\g. 86. Portion of the myce- lium of dry rot or tear fungus, Me rn lilt s lachrymans. This cakelike mass spreads over the surface of the timber. In a moist environment pellucid drops or "tears" distil from it-< lower surface; Hence its name. [Ward: Timber; Fijr 21. J ANIMAI, ENEMIES. The larger animals working damage to our forests are chiefly ro- dents and grazing animals. Beavers gnaw the bark, while mice and squirrels rob the forest of seed and consequently of new trees. The acorns of white oak are particularly liable to be devoured because of their sweetness, while those of red and black oak, which afford timber of comparatively little value, are allowed to sprout, and thus come to possess the land. Hogs annually consume enormous quantities of "mast," i. e., acorns or other nuts, by pasturing in oak and other 240 WOOD AND FOREST. forests. They, together with goats and sheep, Figs. 87 and 88, deer and cattle, work harm by trampling and browsing. Browsing destroys the tender shoots, especially of deciduous trees, but trampling en- tirely kills out the seedlings. The cutting up of the soil by the sharp cleft hoofs injures the forest floor, by pulverizing it and al- lowing it to be readily washed away by storms until defores- tation may result, as was the case in France after the Eevo- lution. It has cost the French people from thirty to forty million dollars to repair the damage begun by the sheep. In New Mexico, u.s. Forest Service. this country, this matter has become a very serious one on the Pacific Coast, where there are enormous flocks of sheep, and there- fore the government is trying to regulate the grazing on public lands there, especially on steep slopes, where erosion takes place rapidly. 1 The most destructive animal enemies of the forest are the insects. The average annual loss of trees in the United States from this cause alone has been estimated to be one hundred million dollars. Fig.88. Sheep Grazing- in Forest, Idaho. U. S. Forest Service. Insects have two objects in their attack on trees, one is to obtain food, as when they are in the larval stage, and the other is to provide for offspring, as do certain beetles. 1 The evils of grazing are increased by the fact that fires are sometimes started intentionally in order to increase the area of grazing land. NATURAIy ENEMIES OF THE FOREST. 241 The number of insect enemies of the forest is enormous. At the St. Louis Exposition, there were on exhibit nearly three hundred such insects. These belong to some twenty orders, of which the beetles (Coleoptera) , which have horny wings and biting mouth parts, and the moths and butterflies (Lepidoptera) , with membraneous wings and sucking mouth parts, are the most destructive. Insects attack every part of the tree, the seed, the shoot, the flower, the root, the leaf, the bark and the wood, both standing and cut. Of the fruit and seed pests, the most destructive are wee- vils, worms and gall insects. Of the twig and shoot pests, beetles, weevils and caterpil- lars are the worst. Among insects that attack roots, the peri- odical cicada (17 year old locust) may be noted. The leaf pests are far more serious. They include the true and false caterpillars, moths, gall insects and plant lice, Of the bark pests, the bark beetles are the most destructive. These are also called Engraver Beetles from the smoothly cut figures which are their burrows under the bark, Figs. 89, 90, 91. Many pairs of beetles make a simultaneous attack on the lower half of the main trunk of medium-sized to large trees. They bore thru the outer bark to the inner living portion, and thru the inner layers of the latter; they excavate long, irregular, longitudinal galleries, and along the sides of these at irregular intervals, numerous eggs are closely placed. The eggs soon hatch and the larvae at once commence to feed on the inner bark, and Fig-. 89. Work of the Spruce Destroying- Beetle: a. Primary gallery; b. Boring's packed in side; c, En- trance and central burrow thru the packed borings; , Larval mines. Note how the eggs are grouped on the sides. \_Agric. Tear Book, 1902, Fig. 24, p. 268.] 242 WOOD AND FOREST. as they increase in size, extend and enlarge their food burrows in a general transverse but irregular course, away from the mother galleries (see illus- tration). When these young and larval forms are full grown, each exca- vates a cavity or cell at the end of its burrow and next to the outer corky bark. (Hopkins, Agric. Yr. Bk., 1902.) Some of the species attack living trees, causing their rapid death, and are among the most destructive enemies of American forests. All of the above in- directly affect both the quantity and quality of the wood supply. They can be studied more in detail in the publications of the U.S. Bureau of Entomology. Of the insects di- rectly attacking wood, the most important are the ambrosia or timber beetles, the bor- ers, the ants, and the carpenter bees. The most remarkable fea- ture of the beetle is the manner of its boring into the harder parts of the wood. Its jaws are particularly con- Fig-. 90. Complete Brood Galleries of the Hickory Bark Beetle in Surface of Wood. [Agric. Tear Book, 1903, Fig. 28, p. 316.] structed for this work, being heavy and strong. The boring is done something after the man- ner of countersinking, and the jaws are believed to be self -sharpening, by reason of the peculiar right to left and left to right motion. Ambrosia or timber beetles, Fig. 92. This class of insects attacks liv- ing, dead, and felled trees, sawlogs, green lumber, and stave-bolts, often causing serious injury and loss from the pin-hole and stained-wood defects caused by their brood galleries. The galleries are excavated by the parent beetles in the sound sap-wood sometimes extending into the heart-wood, and the young stages feed on a fungus growth which grows on the walls of galleries. (Hopkins, Entom. Bulletin No. 48, p. 10.) The growth of this ambrosia-like fungus is induced or controlled by the parent beetles and the your.g are dependent on it for food. (Hopkins, Agric. Yr. Bk., 1904.) NATURAL ENEMIES OF THE FOREST. 243 Fig-. 91. Brood Galleries of the Oak Hark Beetle, showing- Character of Primary Gallery at b; Larval or Brood Mines a"t a. \Agric. Tear Book, 1903, Fig-. 30, page 318.] Pig-. 92. Work of Ambrosia Beetle, Xyloborus celsns, in Hickory Wood: a, Larva; />, Pupa; c, Adult beetle; d. Char- acter of work in' lumber cut from in- jured log-; .', Bark;/, Sap wood; g. Heart- wood. \_Affric. Tear Book, 1904, Fig-. 44, P.384.J There are two general types or classes of these galleries, one in which the broods de- velop together in the main burrows, the other, in which the individuals develop in short separate side chambers extending at right angles from the primary gallery, Fig. 93. The galleries of the latter type are usually accompanied by a distinct staining of the wood, while those of the former are not. (Hopkins, Agric. Yr. Bk., 1904, p. 383.) Bark and ivood borers, Fig. 94. This class of enemies differs from the preceding in the fact that the parent beetles do not burrow into the wood or bark, but deposit their eggs on the surface. The elongate, whitish, round-headed ( Cerambycid ) , flat-headed (Buprestid), or short, stout (Curculionid) grubs hatching from these eggs cause injury by bur- rowing beneath the bark, or deep into the sap-wood and heart- wood of living, in- ]ured and dead trees, saw- ]ogs, etc. Some of the spe- cies infest living trees, Fig. 95, causing serious injury or death. Others attack only dead or dying bark and wood, but this injury often results in great loss from the so-called wormhole de- fects. (A. D. Hopkins, Entom. Bull, No 48. p. 10.) Fig-. 93. Wcrk of Ambrosia Beetles in Oak: a, Monarthum mali, and work; b, Platypus compositus, and work; c, Bark; ~d, Sap-wood; e. Heart-wood; /", Character of work in lumber from in- iured log-. [Agric. Tear Book, 1904, Fig-. *45, p. 384.] 244 WOOD AND FOREST. Fig-. 94. Work of Round-Headed and Flat- Headed Borers in Pine: a, Work of ro-jnd-headed borers, "sawyer," Mono- hamnus sp.; , Ergates spiculatus\ c, Work of flat-headed borer, Buprestis, larva and adult. [Agric. Tear Book. 1904, Fig-f46, p. 385.] The pine sawyers are among the most trouble- some pests in the mill yard, and their large, white larvae often do much damage to logs by eating great holes thru their solid interior. While burrowing in the wood the larvae make a pecu- liar grating sound that may be heard on quiet nights at a considerable distance. This is a fa- miliar sound in the lum- ber camps of the North, and has probably given rise to the name of the pine sawyers by which these insects are known. (Forestry Bulletin, No. 22, p. 58.) Powder-post beetles, Fig. 96. This is a class of insects representing two or three families of beetles, the larvae of which infest and convert into fine powder many different kinds of dry and seasoned wood products, such as hickory and ash handles, wagon spokes, lumber, etc., when wholly or in part from the sap-wood of trees. Oak and hemlock tan-bark is sometimes injured to a great extent, and the structural timbers of old houses, barns, etc, are often seriously injured, while hop poles and like products are at- tacked by one set of these insects, the adults of which burrow into the wood for the purpose of depositing their eggs. ( Hopkins, Forestry Bulletin No. 48, p. 11.) Timber worms, Fig 97. This class of true wood-bor- ing "worms," or grubs, are the lar- vae of beetles. They enter the wood from eggs de- posited in wounds in living trees, from which they burrow deep into the heart- wood. Generation after rnav Fig-. 95. Hemlock Killed bv Buprestid Worms. Hoquiam, Washington. U.S. Forest Service. NATURAL ENEMIES OF THE FOREST. 245 develop in the wood of a tree without affecting its life but the wood Is ren- dered worthless for most purposes by the so-called wormhole and pinhole defects resulting from their burrows. The same species also breed in the wood of dying and dead standing trees, and in the stumps and logs of felled ones, often for many years after the trees are felled. One species sometimes attacks freshly sawed oak lumber, new stave bolts, etc. They are among the most destructive ene- mies of hardwood forest trees, especially in rer ducing the value of the wood of the best part of the trunks. ( Hopkins, Fig-. 96. Work of Powder Post Beetle, Sinoxylon basi- lare, in hickory pole: a, Character of work by larvae; , Exit holes made by emerging- broods. r Book, 1904, Fig. 49.] [ Agric. Tear Forestry Bulletin No. 48, p. 10.) The carpenter worms, Fig. 98. These are large pinkish caterpillars which are the larvae of stout-bodied moths. They enter the bark and wood of living oak, locust, poplar and other trees, from eggs deposited by the moths in the crevices of uninjured bark, or in the edges of wounds. They burrow deep into the solid wood, where they live for two or three years before transforming to the adult. The wood is seriously injured by the very large wormhole defects, and while the life of the tree is but slightly, if at all, af- fected by the earlier at- tacks, the continued operations of this class of borers year after year, finally results in the de- cay of the heart-wood, or a hollow trunk and a dead top. (Hopkins, Forestry Bulletin, No. 48, p. 11.) Columbian Timber- beetle. One of the com- monest wormhole defects in white oak, rock oak, beech, and tulip ("white- wood" or "yellow pop- lar") is one known to the lumber trade as grease spots, patch- worm, or black holes, Fig 99, steam boats, Fig. 100, etc., caused by the Columbian timber beetle (Corthylus co- lumUanus Hopk.) The characteristic feature of this wormhole defect, which will enable it to be readily recognized in oak and beech, is transverse series of two or more black holes about the size of the lead in an ordinary lead pencil, with a streak of stained wood extending with the grain two or three or more inches each side, as in Fig. 99. In quarter-sawed oak or split or Fig. 97. Work of Timber Worms in Oak: , Work of oak timber worm, Eupsalis minuta; b, Barked surface; c, Bark; adult. [Agrfc. Tear Book, 1904, Fig. 53, p. 390.] 248 WOOD AND FOREST. that the results of their investigations show conclusively that there are many practical and inexpensive methods of control now available thru the suggestions and recommendations in recent Department pub- lications on forest insects, as well as thru direct correspondence with the Department. These methods are based on the principle of pre- Fig-. 103. Ichneumon Fly whose I/arva Feeds on the Larva of the Pigeon Horn-tail. vention and not on that of extermination. It has been shown that thru proper adjustment of the details in management of forests and of the business of manufacturing, storing, transporting, and utilizing the products a large percentage of the losses can be prevented at small additional expense, and that even when considerable cost is involved the amount saved will often represent a handsome profit. NATURAL ENEMIES OF THE FOREST. 249 THE NATURAL ENEMIES OF THE FOREST. REFERENCES : * ( 1 ) Meterological. Pinchot, Primer I, pp. 75-76. Bruncken, pp. 27-29. Roth, First Book, pp. 198- 202. Water. Roth, First Book, p. 27. Snow, ice and frost. Pinchot, Primer, I, p. 70. Bruce, For. and 2rr., 8: 159, Ap. '02. (2) Vegetable. Roth, First Book, p. 4. Sherfesee. For. Circ. No. 139. Boulger, pp. 70-75. von Schrenck, Bur. Plant Ind. Bull. Spaulding, For. Bull., No. 22. No. 36. Ward, Chaps. V, VI, VII. von Schrenck, Bur. Plant Ind. Bull. Sickles, pp. 41-45. No. 32. von Schrenck, For. Bull., No. von Schrenck, Agric. Yr. Bk., 1900, 41, PL III. p. 199. (3) Animal. Grazing. Pinchot, Primer I, pp. 69- Coville, For. Bull. No. 15, pp. 28-31. 73, II, p. 73. Pinchot, Agric. Yr. Bk., 1898, Roth, First Bk., p. 130, 178. p. 187. Insects. Comstock, passim. Hopkins, Agric. Yr. Bk., 1903, pp. Hopkins, Agric. Yr. Bk., 313-328. 1902, pp. 265-282. Hopkins, Agric. Yr. Bk., 1904, pp. Roth. First Book, pp. 115- 382-389, Figs. 43-56. 130. Pinchot, Primer, I, p. 73. Howard, Entom. Bull., No. Felt, N. Y. State Museum Bull., 11, n. s. 103, Ent. 25. Hopkins, Spaulding, Entom. Hopkins, Entom. Bull. No. 32. Bull, No. 28. Hopkins, Entom. Bull. No. 56. Hopkins, Entom. Bull., No. Hopkins, Entom. Bull. No. 58. 48. Spaulding and Chittenden, For. Bull. No. 22, pp. 55-61. *For general bibliography, see p. 4. CHAPTER VII. THE EXHAUSTION OF THE FOREST. The exhaustion of the forest in the United States is due to two main causes: (1) Fire, and (2) Destructive Lumbering. FIRE. It is not commonly realized that forest fires are almost entirely the result of human agency. When cruisers first began to locate claims in this country, practically no regions had been devastated by fire. Now such regions are to be seen everywhere. Altho lightning Fig. 104. Slash, Left in the Woods, and'fReady to Catch Fire. U. S. Forest Service. occasionally sets fire to forests, especially in the Rocky Mountains, the losses from this cause are trifling compared with the total loss. Opportunities for fire. There are a number of facts that make the forest peculiarly liable to fire. Especially in the fall there are great quantities of inflammable material, such as dry leaves, twigs, and duff lying loose ready for ignition. The bark of some trees, as "paper birch," and the leaves of others, as conifers, are very inflammable. It follows that fires are more common in coniferous than in deciduous forests. After lumbering or windfalls, the accumulated "slash" burns easily and furiously, Fig. 104. Moreover a region once burned over, 251 252 WOOD AND FOREST. is particularly liable to burn again, on account of the accumulation of dry trunks and branches. See Fig. 107. Long dry seasons and high wind furnish particularly favorable conditions for fire. On the other hand, the wind by changing in di- rection may extinguish the fire by turning it back upon its track. Indeed the destructive power of fires depends largely upon the wind. Causes of fire. Forest fires are due to all sorts of causes, accidental and intentional. Dropped matches, smouldering tobacco, neglected Fig-. 105. Forest Fire. U. S. Forest Service. camp fires and brush fires, locomotive sparks, may all be accidental causes that under favorable conditions entail tremendous loss. There is good reason to believe that many forest fires are set intentionally. The fact that grass and berry bushes will soon spring up after a fire, leads sheep men, cattle and pig owners, and berry pickers to set fires. Vast areas are annually burned over in the United States for these reasons. Most fires run only along the surface of the ground, doing little harm to the big timber, and if left alone will even go out of themselves ; but if the duff is dry, the fire may smoulder in it a long time, ready to break out into flame when it reaches good fuel or EXHAUSTION OF THE FOREST. 253 when it is fanned by the wind, Fig. 105. Even these ground fires do incalculable damage to seeds and seedlings, and the safest plan is to put out every fire no matter how small. Altho it is true that the loss of a forest is not irremediable be- cause vegetation usually begins again at once, Fig. 106, yet the actual damage is almost incalculable. The tract may lie year after year, covered with only worth- less weeds and bushes, and if hilly, the region at once begins to be eroded by the rains. After the fire, may come high winds that blow down the trunks of the trees, preparing material for another fire, Fig. 107. The statistics of the actual annual money loss of the tim- ber burned in the United States are not gathered. In 1880 Professor Sargent collected much information, and in the census of that year (10th Cen- sus, Vol. IX) reported 10,000,- 000 acres burned that year at a value of $25,000,000. In 1891, the Division of Forestry collected authentic records of 12,000,000 acres burned over in a single year, at an estimated value of $50,- 000,000. In the Adironacks in the spring of 1903, an unprecedent- edly dry season, fire after fire caused a direct loss of about $3,500,000. In 1902, a fire on the dividing line between Washington and Ore- gon destroyed property amounting to $12,000,000. Within compara- tively recent years, the Pacific Coast states have lost over $100,000,- 000 worth of timber by fire alone. Fig. 106. Burned Forest of Eng-elmann Spruce. Foreground, Lodgepole Pine Com- ing- in. U. S. Forest Service. 254 WOOD AND FOREST. During September, 1908, forest fires raged in Minnesota, Michi- gan, Wisconsin, Maine, New York and Pennsylvania. The estimates of loss for northern Michigan alone amounted to $40,000,000. For two weeks the loss was set at $1,000,000 a day. The two towns of Fig-. 107. Effect of Fire and Wind. Colorado. U. S. Forest Service. Hibbing and Chisholm were practically wiped out of existence, and 296 lives were lost. Certain forest fires have been so gigantic and terrible as to become historic. One of these is the Miramichi fire of 1825. It began its greatest de- struction about one o'clock in the afternoon of October 7th of that year, at a place about sixty miles above the town of Newcastle, on the Miramichi River, in New Brunswick. Before ten o'clock at night it was twenty miles below New Castle. In nine hours it had destroyed a belt of forest eighty miles long and twenty-five miles wide. Over more than two and a half million acres almost every living thing was killed. Even the fish were afterwards found dead in heaps on the river banks. Many buildings and towns were destroyed, one hundred and sixty persons perished, and nearly a thousand head of stock. The loss from the Miramichi fire is estimated at $300.000, not including the value of the timber. (Pinchot, Part I, p. 79-80.) EXHAUSTION OF THE FOREST. 255 Of such calamities, one of the worst that is on record is that known as the Peshtigo fire, which, in 1871, during the same month, October, when Chi- cago was laid in ashes, devastated the country about the shores of Green Bay in Wisconsin. More than $3,000,000 worth of property was burnt, at least two thousand families of settlers were made homeless, villages were destroyed and over a thousand lives lost. (Bruncken, p. 110.) The most destructive fire of more recent years was that which started near Hinckley, Minn., September 1, 1894. While the area burned over was less than in some other great fires, the loss of life and property was very heavy. Hinckley and six other towns were destroyed, about 500 lives were lost, more than 2,000 persons were left destitute, and the estimated loss in property of various kinds was $25,000,000. Except for the heroic conduct of locomotive engineers and other railroad men, the loss of life would have been far greater. This fire was all the more deplorable, because it was wholly unnecessary. For many days before the high wind came and drove it into uncontrollable fury, it was burning slowly close to the town of Hinckley and could have been put out. (Pinchot, Part I, 82-83.) One of the most remarkable features of these "crown fires," is the rapidity with which they travel. The Miramichi fire traveled nine miles an hour. To get an idea of the fury of a forest fire, read this description from Bruncken. After describing the steady, slow progress of a duff fire, he proceeds : But there comes an evening when nobody thinks of going to bed. All day the smoke has become denser and denser, until it is no longer a haze, but a thick yellowish mass of vapor, carrying large particles of sooty cinders, filling one's eyes and nostrils with biting dust, making breathing oppressive. There is no escape from it. Closing windows and doors does not bar it out of the houses; it seems as if it could penetrate solid walls. Everything it touches feels rough, as if covered with fine ashes. The heat is horrible altho no ray of sunshine penetrates the heavy pall of smoke. In the distance a rumbling, rushing sound is heard. It is the fire roaring in the tree tops on the hill sides, several miles from town. This is no longer a number of small fires, slowly smouldering away to eat up a fallen log; nor little dancing flames running along the dry litter on the ground, trying to creep up the bark of a tree, where the lichens are thick and dry, but presently falling back exhausted. The wind has risen, fanning the flames on all sides, till they leap higher and higher, reaching the lower branches of the standing timber, enveloping the mighty boles of cork pine in a sheet of flame, seizing the tall poles of young trees and converting them into blazing beacons that herald the approach of destruction. Fiercer and fiercer blows the wind, generated by the fire itself as it sends currents of heated air rushing upward into infinity. Louder and louder the cracking 256 WOOD AND FOREST. of the branches as the flames seize one after the other, leaping from crown to crown, rising high above the tree tops in whirling wreaths of fire, and belching forth clouds of smoke hundreds of feet still higher. As the heated air rises more and more, rushing along with a sound like that of a thousand foaming mountain torrents, burning brands are carried along, whirling on across the firmament like evil spirits of destruction, bearing the fire miles away from its origin, then falling among the dry brush heaps of windfall or slashing, and starting another fire to burn as fiercely as the first. * * * There is something horrible in the slow, steady approach of a top fire. It comes on with the pitiless determination of unavoidable destiny, not faster than a man can walk. But there is no stopping it. You cannot fight a fire that seizes tree top after tree top, far above your reach, and showers down upon the pigmy mortals that attempt to oppose it an avalanch of burning branches, driving them away to escape the torture and death that threatens them. (Bruncken, American Forests and Forestry, 106-109.) Fig. 108. Fig-hting- Forest Fire. U. S. Forest Service. Real forest fires are not usually put out; men only try to limit them. A common method of limitation is to cut trenches thru the duff so that the fire cannot pass across, Fig. 108. In serious cases EXHAUSTION OF THE FOREST. 257 back fires are built on the side of the paths or roads or trenches toward the fire, in the expecta- tion that the two fires will meet. In such cases great care has to be taken that the back fire itself does not escape. Small fires, however, can sometimes be beaten out or smothered with dirt and sand, since water is usually un- available. But "an ounce of prevention is worth a pound of cure." One of the best of these preventions is a system of fire lanes. Even narrow paths of dirt will stop an ordinary fire. Roads, of course, are still better. Systems of fire lanes, Fig. 109, are made India. Belts of hardwood trees Fig-.llO. Look out for Fire. Rules and Laws Fig-. 109. Fire Lane. Worcester Co., Mass. U. S. Forest Service. great use of in Europe and British are also cultivated along railways, and to break up large bodies of conifers. If in lumbering^ the slash were destroyed or even cut up so as to lie near the ground and rot quickly, many fires would be prevented. Some states, as New York, have a fairly well organ- ized system of fire wardens, who have the authority to draft as much male help as they need at $2.00 a clay to fight forest fires. Unfortu- nately "ne'er-do-wells" some- times set fire to the woods, in order to "make work" for themselves. Much preventive 258 WOOD AND FOREST. work is also done by educating the public in schools and by the post- ing of the fire notices/ Fig. 110. DESTRUCTIVE LUMBERING. How the reckless and destructive methods of lumbering common in America came into vogue, is worth noting. 2 The great historical fact of the first half century of our country was the conquest of the wilderness. That wilderness was largely an unbroken forest. To the early settler, this forest was the greatest of barriers to agriculture. The crash of a felled tree was to him a symbol of advancing civilization. The woods were something to be got rid of to make room for farms, Fig. 111. In Virginia, for ex- ample, where the soil was soon exhausted by tobacco, culture and modern fertilizers were unknown, there was a continual advance into 'LOOK OUT FOR FIRE! RULES AND LAWS. Fires for clearing land near a forest must not be started until the trees are in full leaf. Before lighting such fires three days' notice, at least, must be given to the Firewarden and occupants of adjoining lands. After such fires are lighted, competent persons must remain to guard them until the fire is completely extinguished, and the persons starting such fires will be held responsible for all damages notwithstanding notice had been given to the Firewarden. Fires will be permitted for the purposes of cooking, warmth and insect smudges, but before such fires are kindled, sufficient space around the spot where the fire is to be lighted must be cleared from all combustible material; and before the place is abandoned, fires so lighted must be thoroly quenched. All fires other than those hereinbefore mentioned are absolutely prohibited. Hunters and smokers are cautioned against allowing fires to originate from the use of firearms, cigars and pipes. Especial care should be taken that lighted matches are extinguished be- fore throwing them down. All persons are warned that they will be held responsible for any damage or injury to the forest which may result from their carelessness or neglect. Girdling and peeling bark from standing trees on state land is prohib- ited. Fallen timber only may be used for firewood. All citizens are requested to report immediately any cases which may come to their knowledge of injury to woodlands arising from a violation of these rules. Then follow quotations from the laws of the state of New York. 2 For the common methods of logging see Handwork in Wood, Chapter 1 EXHAUSTION OF THE FOREST. 259 260 WOOD AND FOREST. the woods to plant on new and richer land. The forest was also full of enemies to the settler, both animals and IndianSj and was a dreaded field for fire. So there grew up a feeling of hate and feai for the forest. More than that the forest seemed exhaustless. The clearings were at first only specks in the woods, and even when they were pushed farther and farther back from the seacoast, there was plenty of timber beyond. The idea that the area of this forest could ever be diminished by human hands to any appreciable extent so that people would become afraid of not having woodland enough to supply them with the needed lumber, would have seemed an utter absurdity to the backwoodsman. * * * Thus the legend arose of the inexhaustible supply of lumber in American forests, a legend which only within the last twenty years has given place to juster notions. (Bruncken, p. 57.) This tradition of abundant supply and the feeling of hostility to the forest lasted long after the reasons for them had disappeared. When we remember that every farm in the eastern United States, is made from reclaimed forest land and that for decades lumber was Fig. 112. Redwood Forest Turned Into Pasture. California. U. S. Forest Service. always within reach up the livers, down which it was floated, it is not strange that reckless and extravagant methods of cutting and using it prevailed. Following the settler came the lumberman, who continued the same method of laying waste the forest land. The lumber market grew slowly at first, but later developed by leaps and bounds, until now the output is enormous. EXHAUSTION OF THE FOREST. 261 Lumbering in America has come to be synonymous with the clear- ing off of all the marketable timber, regardless of the future. It treats the forest as tho it were a mine, not a crop, Fig. 112. Since 1880 the total cut has been over 700,000,000 feet, enough to make a one inch floor over Vermont, Massachusetts, Connecticut, Ehode Is- land and Delaware, or one-half of the State of New York, an area of 25,000 square miles. Other countries, too, have devastated their forests. Portugal has a forest area of only 5 per cent, of the total land area, Spain and Greece, each 13 per cent., Italy 14 per cent, and Turkey 20 per cent. Whether the destruction of the American forests shall go as far as this is now a live question which has only just begun to be appre- ciated. Another reason for the reckless American attitude toward the forest is the frequency and severity of forest fires. This has led to the fear on the part of lumbermen of losing what stumpage they had, and so they have cleared their holdings quickly and sold the timber. Their motto was "cut or lose." A third incentive to devastative methods was the levy of what were considered unjust taxes. Hundreds of thousands of acres in the white pine region, notably in Michigan, Wisconsin, and Minnesota, have been cut over, abandoned, sold for taxes, and finally reduced by fire to a useless wilderness because of the shortsighted policy of heavy taxation. To lay heavy taxes on timber land is to set a premium on forest destruction, a premium that is doing more than any other single factor to hinder the spread of conservative lumbering among the owners of large bodies of timber land. * * * Heavy taxes are responsible for the barrenness of thousands of square miles which should never have ceased to be productive, and which must now lie fallow for many decades before they can be counted again among the wealth-making assets of the nation. (Pinchot, Agric. Yr. Bk., 1808, pp. 184-185.) On the treatment of the questions of fire and taxes depends the future of American forest industries. (Bruncken, p. 226.) Undoubtedly much waste has been caused by sheer ignorance of forest conditions and methods, which, if followed, would secure suc- cessive crops instead of one, but it is safe to say that the desire for immediate profits has been the dominant cause of reckless lumbering. So short-sighted has the policy of private owners proved itself, that it is a question whether any large extent of forest land can safely be left in private hands. No individual lives long enough to reap more 262 WOOD AND FOREST. than one forest crop. Only corporations and States can be expected to have an interest long enough continued to justify the methods of conservative lumbering. As a matter of fact, nearly one-half of the privately owned tim- ber of the United States is held by 195 great holders, the principal ones being the Southern Pacific Company, the Weyerhauser Timber Company, and the Northern Pacific Railway Company, which to- gether own nearly 11 per cent, of the privately owned forests of the country. These large holders are cutting little of their timber, their Fig-. 113. Red Spruce Used in Building- Skidway, and Left in the Woods. Hamilton Co., New York. object, however, being not so much to conserve the forests as to re- serve to themselves the incalculable private profits which are ex- pected to come with the future enormous increase in the value of timber. Over against this policy, stands that of the United States Forest Service of increasing the area of the National Forests in order to conserve them for the public welfare. The pity is that the govern- ment ever let the forests pass out of its hands. Only forty years ago seventy-five per cent, of the timber now standing was publicly owned. EXHAUSTION OF THE FOREST. 263 about eighty per cent, of it is privately owned. In the meanwhile its value has increased anywhere from ten to fifty fold, according to locality. 3 Some large corporations, however, like the Pennsylvania Railroad, the Kirby Lumber Company, of Texas, and the Interna- tional Paper Company, have entered upon a policy of conservative lumbering. Of the actual practices which distinguish destructive lumbering, a few may be cited. Stumps are cut too high and tops too low. Good lumber is wasted on lumber roads and bridges, Fig. 113. Saplings are Fig. 114. Turpentine Boxing, Cup System. Georgia. U. S. Forest Service. torn down in dragging out logs. Slash is left in condition to foster fires and left with no shade protection. Seedlings are smothered with slash. Seed trees are all cut out leaving no chance for repro- duction. Only poorer sorts of trees are left standing, thus insuring deterioration. Paper pulp cutting goes even farther than lumbering, and ordinarily leaves nothing behind but a howling wilderness. The production of turpentine from the long-leaf pine, Fig. 114, at the annual rate of 40,000 barrels has meant the devastation of 70,000 acres of virgin forest. 3 See Summary of Report of the Commissioner of Corporations on the Lumber Industry. February 13, 1911. Washington, D. C. 264 WOOD AND FOREST. In view of this wholesale destruction it becomes of interest to know how much still remains of the timber supply of the United States. The latest and most authoritative estimate of standing tim- ber in continental United States, excluding Alaska, gives a total of 2,800,000,000 M feetB.M., 4 of which 2,200,000,000 M feet are pri- vately owned, about 539,000,000 M feet are in the National Forests (Fig. 119, p. 271,) and 90,000,000 M feet are on the unreserved pub- lic lands, National parks, State lands and Indian reservations. Earlier estimates were hardly more than guesses. For example the census of 1880 estimated the stumpage of the U. S. at 856,290,- 100 M feet, while the census of 1900 gives a total of 1,390,000,000 M feet. The discrepancy appears still greater when it is remembered that in the meantime 700,000,000 M feet were cut. Of this amount 500,000,000 M feet were of conifers or 80,000,000 M feet more than were included in the estimate of 1880. The simple fact is of course that the earlier estimates were gross underestimates, due to the fact that they were based on entirely inadequate data, and therefore can not be used to obscure the now unquestionable fact that the timber supply of this country is surely and rapidly melting away. The Forest Service estimates that the present annual cut of saw timber is about 50,000,000 M feet. At this rate the present stand would last about 55 years and the privately owned timber only 44 years. This estimate does not allow for growth and decay. While the population of the United States increased 52 per cent, from 1880 to 1900, during the same period the lumber-cut increased 94 per cent. In other words the yearly increase in use is 20 to 25 per cent, per capita, that is, fast as the population grows, the lumber consumption increases nearly twice as fast. This increase in the lumber-cut far overbalances the growth of trees. It is also to be remembered that this increase in the use of lum- ber is in spite of the enormous increase of substitutes for lumber, such as brick, cement and steel for building, and steel for bridges, vehicles, fences, machinery, tools, and implements of all kinds. How lavishly we use lumber may further be appreciated from the fact that we consume 260 cubic feet 5 per capita, while the average for 13 European countries is but 49 cubic feet per capita. In other * A board foot is one foot square and one inch thick. 5 167 cubic feet equal about 1000 board feet. EXHAUSTION OF THE FOREST. 265 words every person in the U. S;. is using five times as much wood as he would use if he lived in Europe. It is estimated that on an average each person in this country uses annually the product of 25 acres of forest. The country as a whole, cuts every year, between three and four times more wood than all the forests grow in the meantime. By contrast, the principal countries of Europe, cut just the annual growth, while Russia, Sweden and Japan, cut less than the growth. In other words, the 2,800,000,000,000 feet B.M. of the stumpage of the United States is a capital which is constantly drawn upon, whereas, the 944,700,000,000 board feet of the forest of the German Lumber Production />y Re Q/ons. 1907 1 6M,,,t of *.V M Poplar ss=- f\e