John B. Watson was a budding psychologist, living at a time when psychology focused on studying consciousness. Watson, however, felt that focusing merely on unobservable mental process, through introspection, made it impossible for psychology to “make its place in the world as an undisputed natural science.” (1913, p. 163) He believed psychology should focus on predicting and controlling behavior instead. This belief eventually led to the school of psychology known as behaviorism. Much of Watson’s correspondence with Robert M. Yerkes (a fellow animal psychologist) allows us to understand on a deeper level Watson’s thoughts and feelings about the world of psychology and how his view would alter that world for the better. Based on the letters,