GENERAL PHYSIOLOGY 79 



own sake and not necessarily for its applications to 

 medicine. 



Haller's elements of physiology (Elementa Phys- 

 iologies) published in 1758 was the first comprehen- 

 sive treatise devoted exclusively to that subject. 

 After Haller physiology, now opened for investiga- 

 tion, grew rapidly. We must remember, however, 

 that Harvey was the pioneer who introduced experi- 

 mental study into biological science. The work of 

 Haller greatly broadened the field and encouraged 

 physiological experimentation . 



From the time of Haller we pass to the nineteenth 

 century. In the opening year of that century was 

 born a man, Johannes Miiller, who exercised great 

 influence not only on physiology but upon the whole 

 field of biological science. Verworn says of him: 

 "He is one of those monumental figures that the 

 history of every science brings forth but once. They 

 change the whole aspect of the field in which they 

 work, and all later work is influenced by their 

 labors." Although Miiller was professor of Phys- 

 iology at Bonn, and later at Berlin, he was also an 

 anatomist and, perhaps, more of a morphologist in 

 his methods of investigation than physiologist. He 

 was great in his general influence. He had an un- 



