In writing a volume of this kind, one becomes keenly aware that science is indeed a community of scholars. We stand on the shoulders of giants, and mistake the broadened vision for our own. In this instance the giants are Kurt Lewin, George Herbert Mead, Sigmund Freud, William I. and Dorothy S. Thomas, Edward C. Tolman, Lev Vygotsky, Kurt Goldstein, Otto Rank, Jean Piaget, and Ronald A. Fisher. ·From these I learned mainly by reading. There are others who struggled to teach me, often against resistance. Chief among them were my first teachers in psychology, Frank S. Freeman, Robert M. Ogden, and Walter Fenno Dearborn. Lauriston Sharp introduced me to.
