January 1951 
 
 ET-2!j2 
 
 United States Department of Agriculture 
 
 Agricultural Research Administration 
 
 Bureau of Entomology and Plant Quarantine 
 
 LIST OF 
 ENTOMOLOGICAL TECHNIQUE (ET-SERIES) PUBLICATIONS 271 to 291 
 
 Compiled by Division of Insect Survey and Information 
 
 This list includes the ET publications that were issued from July 1949 
 through December 1950. Five previous lists for this series have been 
 issued: 1 to 50 in October 1935, 51 to 100 in December 1937, 101 to 150 
 in September 1939, 151 to 233 in September 1946, and 234 to 270 in 
 August 1949. 
 
 ET-271. A Simplified Procedure for Cleaning and Filling Aerosol 
 
 Cylinders in the Laboratory. R. A. Fulton. July 1949. 
 
 ET-272. A Photographic Method for Recording Size of Spray Drops. 
 J. M. Davis. July 1949. 
 
 ET-273. An Improved Apparatus for Observing Aerosol Solutions and 
 Determining Freon-Insoluble Matter in Pyrethrum Extract. 
 R. A, Fulton. July 1949. 
 
 ET-274. List of Entomological Technique (ET-Series) Publications 
 234-270. Division of Insect Survey and Information. 
 August 1949. 
 
 ET-275. Short-Cut Procedure for Error Estimate in Laboratory Studies 
 of Synergism in Insecticides. F. M. Wadley. August 1949. 
 
 ET-276. Fertilizer Spreader Modified to Apply Insecticidal Dusts. 
 W. C. Fest and A. R. Whitcraft. September 1949. 
 
 ET-277. A Collapsible Cage for Field Use. R. L. Wallis. 
 September 1949. 
 
 ET-278. An Improved Trap for Collecting Aphids. E. W. Davis and 
 B. J. Landis. December 1949. 
 
 ET-279. A Device for Spraying Bean Seed in the Row While Planting. 
 John C. Elmore. January 1950. 
 
UNIVERSITY OF FLORIDA 
 
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 3 1262 09242 9363 
 
 ET-280, A Sprayer for Dispensing Small Measured Quantities of Liquid. 
 Orin A. Hills and Edgar A. Taylor. January 1950. 
 
 ET-281. Determining the Catch of Cigarette Beetles in Suction-Light 
 Traps in Cigar Factories or Cigar-Tobacco Storages. 
 Joseph N. Tenhet and C. O. Bare. February 1950. 
 
 ET-282, Directions for Applying Windborne Aerosols for Insect Control 
 Out of Doors. A. H. Yeomans. May 1950. 
 
 ET-283. Tumbling Equipment for Recovery of Insecticide Residues. 
 C. H. Batchelder and O. E. Berndt. May 1950. 
 
 ET-284. Gravity-Flow Equipment for Dispersing Insecticides from 
 
 Aircraft. Frank S. Faulkner, C. C. Deonier, and A. N. 
 Davis. June 1950. 
 
 ET-285. A Rapid Vat-Side Test for Assaying Toxaphene in Cattle Dips. 
 C. V. Bowen. June 1950. 
 
 ET-286. Propeller-Blower Applicator for Fumigation with Hydrocyanic 
 Acid. Harold R. Yust. June 1950. 
 
 ET-287. Construction of a Simple Air Flowmeter. F. A. Fulton and 
 Frank S. Phinney. July 1950. 
 
 ET-288. A Device for Transferring Insects from Holding Cages to 
 Test Containers. Robert A. Hoffman. July 1950. 
 
 ET-289. A Portable Field Cage. Marion W. Pedersen, Frank E. Todd, 
 and Frank V. Lieberman. August 1950. 
 
 ET-290. An Improved Syringe Hydrometer. C. V. Bowen. 
 August 1950. 
 
 ET-291. Thresher and Separator for Red Clover Seed Samples. 
 A. W. Woodrow and B. A. App. October 1950.