nal of Educational Psychology, Scientific Monthly, Pennsylvania School Journal, Teachers College Record, Journal of Educational Research, Journal of Educational Method, Educational Review, American Magazine, and others.
Acknowledgment is made to the following authors for their generosity for permission to quote extensively from their writings: Charles H. Judd, Edward Lee Thorndike, John B. Watson, William McDougall, J. A. H. Keith, W. C. Bagley, Eugene Nifenecker, R. M. Ogden, W. H. Kilpatrick, C. B. Davenport, Morton Prince, Max G. Schlapp, Louis Pechstein, H. O. Rugg, K. S. Lashley, Joseph Peterson, C. E. Benson, Knight Dunlap, E. George Payne, John Dewey, John Edward Bentley, H. H. Horne, Kurt Koffka, C. L. Redfield, G. M. Whipple, L. T. Hobhouse, and James R. Angell.