242 PRINCIPLES OF PHYSIOLOGY 



applied tentatively to the explanation of 

 physiological processes. The result is remark- 

 able. On all hands it is admitted that the 

 phenomena in living matter are much more 

 complex than they were at one time thought 

 to be, and everywhere we are brought face to 

 face with vital conditions which modify the 

 physical phenomena, and which, at present, 

 refuse to be explained. One may be sure that 

 a century hence advanced mathematicians, 

 chemists and physicists (the physiologists of 

 their day) will still be working at the problems 

 of physiology. 



