DEVELOPMENT OF MODERN COMPARATIVE PSYCHOLOGY 



PLATE 6 



i. R. M. Yerkes, 1876- ; from a photograph. 1. Henri Pieron, 1S81- ; from a photograph. 

 3. I. P. Pavlov, 1849- ; photograph by Science Service, Washington. 4. V. M. Bekhterev, 1857- 

 1915; from Die Medium tier Gegenwart with per. Felix Meiner, Leipzig. 5. J. B. Watson, 1878- ; 

 photo by Bachrach. 6. H. A. Carr, 1873- ; photograph by Science Service, Washington. 



