Columbia XDlnfversftv (Tontrfbutions to Ebucation Ccacbere Collcae Series Glass. Book. Copyright^" COPYRIGHT DEPOSm THE EDUCATIONAL THEORY AND PRACTICE OF T. H. GREEN ABBY PORTER LELAND, PH.D. TEACHERS COLLEGE, COLUMBIA UNIVERSITY CONTRIBUTIONS TO EDUCATION, No. 46 PUBLISHED BY aipartyfro (finllrgr, CEnlumbta Uniwrattg NEW YORK CITY 1911 I ^'-^ -v. ^V '■^