n6 Studies in Animal Behavior 



he soon finds himself hampered by the paucity of 

 knowledge in those fields to which he would naturally 

 turn for helpful suggestions. It would be very de- 

 sirable to have a more adequate knowledge of the 

 inner mechanism of orientation. It would be very 

 helpful to have a deeper insight into the physiology 

 of irritability. We know little of the processes cov- 

 ered by the word stimulation. We are still looking 

 for a satisfactory explanation of the curious phe- 

 nomenon of inhibition. The behaviorist may discover 

 many facts of interest and value regarding the re- 

 versal of tropisms, but before arriving at an ade- 

 quate explanation of this perplexing phenomenon he 

 may have to wait until some of the more general and 

 fundamental problems of irritability have been 

 solved. 



REFERENCES 



BANCROFT, F. W. ( i ) The control of galvano- 

 tropism in Paramoecium by chemicals. Univ. of 

 Calif. Pubs. Physiol. 3, 21, 1906; (2) Heliotro- 

 pism, etc., in Euglena. Jour. Exp. Zool. 15, 383, 



BAUER, V. Ueber die reflektorische Regulie- 

 rung der Schwimmbewegungen bei den Mysideen, 

 etc. Zeit. allg. Physiol. 8, 343, 1908. 



BOHN, G. La naissance de 1'intelligence. Paris, 

 1909. 



DAVENPORT, C. B. Experimental Morphology. 

 N. Y., 1897-99. 



