288 PRINCIPLED OF ANIMAL BIOLOaV 



and zoogeography. In so far as it concerns itself with the determination 

 of the nature of the interrelations it is physiology, and the term physio- 

 logical ecology has been used to designate this work. The results of these 

 studies as well as the determination of the composition of the associations 

 provide the data upon which zoogeographical studies must be based, if 

 the latter phase of zoology is to be concerned with causes. The more im- 

 portant questions of geographical distribution of animals, which involves 

 to a large extent the ecological relations, are reserved for the following 

 chapter. 



References 



Adams, Charles C. Principles of Animal Ecology. 



Semper, Karl. Animal Life. 



Shelford, V. E. Animal Communities in Temperate America. 



