CHAPTER VIII 



GENERAL PHYSIOLOGY AS A DIVISION OF 



ZOOLOGY 



THE study of structure and development is not 

 enough to acquaint us with the essential features of 

 an animal. The most significant thing about animal 

 mechanism is that it is endowed with life and we 

 should observe the principal activities of the mech- 

 anism along with its structure. As before indi- 

 cated, morphology and physiology represent the main 

 divisions of zoology. While physiology as a science 

 has advanced to great proportions and to a position 

 of independence, nevertheless general physiology of 

 animals is a part of zoology. It will, therefore, be 

 appropriate at this point to engage in a considera- 

 tion of the rise of physiology without attempting to 

 separate general physiology of animals from the main 

 current. 



Morphology and physiology had a parallel devel- 

 opment. Just as Vesalius renovated structural 

 studies so Harvey by demonstrating the circulation 

 of the blood gave life to a new physiology. 



This demonstration of the circulation had more 



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