LIST OF ILLUSTRATIONS 



The Reflex Arc 15 



Brain of a Cat and of a Crow 20 



Sections through Cerebral Hemispheres of Cat and Crow. . 22 



Attempts at Building of a Pair of Dippers 25 



Crustacean "Ear" and Internal Ear of Crow 30 



Diagram of Human Ear 31 



A Part of Section of Testis and Ovary of Junco 39 



World-Map with Southern Hemisphere Inverted and Im- 

 posed on Northern 52 



Geological Table 66 



Map of Northern Hemisphere 70 



Compulsory Exercise Cage 124 



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