XVII THE SENSE ORGANS 341 



Plateau, E. Sur la vision des poissons et des amphibies. Ann. 

 Nat. Sci. (5),T. 7, 1867. 



Retzius, G. Das Gehororgan der Wirbelthiere, i. Stockholm, 1881. 



Schrader, M. Zur Physiulogie des Froschgehirns. Arch. ges. 

 Phys., Bd. 41, 1887. 



Steiner, J. Die Functionen des Centralnervensystems und ihre 

 Phylogenese. Leipzig, 188S. 



Yerkes, R. M. Inhibition and Reinforcement of Reactions in the 

 Frog, Rana cla7nitans. Jour. Comp. Neur. and Psych., Vol. 14, 1904. 

 The Instincts, Habits, and Reactions of the Frog. Monogr. Suppl. 

 Psych. Rev., Vol. 4, 1903. The Sense of Hearing in Frogs. Jour, 

 Comp, Neur. and Psych., Vol. 15, 1905. 



