RELATION OF PHYSIOLOGY TO PHYSICS. 19 



main contention which I have endeavoured to place 

 before you. It is that in physiology, and biology 

 generally, we are dealing with phenomena which, so 

 far as our present knowledge goes, not only differ in 

 complexity, but differ in kind from physical and chemi- 

 cal phenomena ; and that the fundamental working 

 hypothesis of physiology must differ correspondingly 

 from those of physics and chemistry. 



That a meeting-point between biology and physical 

 science may at some time be found, there is no reason 

 for doubting. But we may confidently predict that if 

 that meeting-point is found, and one of the two sciences 

 is swallowed up, that one will not be biology. 



