^i,3ri 



X 



Behavior Mono»'APhs 



Volume 4. Number 3, 1919 Serial Number 19 



' Edited by JOHN B. WATSON 



The Johns Hopkins University 



Discrimination of Light of Different 

 Wave-Lengths by Fish 



BY 

 CORA D. REEVES 



Published 



at Cambridge, Boston, Mass. 



HENRY HOLT & COMPANY 



34 West 33d Street, New York 



G. E. STECHERT & CO., London, Paris and Leipzig, Foreign Agents 



