References
- The author is grateful to the following for their cooperation in securing data from their classes: Professors Rexford Mitchell, Lawrence College; J. T. Marshman, Ohio Wesleyan University; H. L. Ewbank, University of Wisconsin; Donald Hayworth, University of Akron; Vernon Utzinger, Carroll College; Myron Phillips, Wabash College; C. Horton Talley and Enid Miller, Nebraska Wesleyan University; Charles Templer, Hamline University; and Robert Capel, Hendrix College.