ABSTRACT
By the turn of the twentieth century, some forty years after Darwin’s Origin of Species, many neurologists and psychologists had grasped the importance of evolution for helping to understand brain-behavior relationships. Elliot Smith, Ariëns-Kappers, and the two Herricks in comparative neurology, and Thorndike, Yerkes, and Jennings, in comparative psychology, marked this period with an enthusiastic outburst of activity. Conscious effort was expended toward cooperation between the two fields. Correspondence between men like C. J. Herrick and Yerkes flourished and by 1908 Yerkes, Jennings, and Watson were members of the editorial board of the Journal of Comparative Neurology.
