526 POPULAR SCIENCE MONTHLY 



his vitalistic hypothesis did not prevent him in the least from directing 

 his labor to establish life phenomena on a physico-chemical basis. 

 Even the vitalistic principle, as it appertains to the philosophy of the 

 present day, is largely a matter of man's personal and ultimate view 

 of his own life and his own destiny. 



In our consideration of the relation of Miiller's thought to the 

 Naturphilosophie of his time, we must not deny the fact that Miiller 

 did recognize a grain of truth in the general philosophic tendencies of 

 that day. As Verworn says : " While keeping constantly in mind 

 the large problems and the goal of science, he regarded critically the 

 special methods and questions only as means to an end — as means for 

 arriving at a harmonious conception of nature." Throughout his whole 

 life he remained steadfastly true to this philosophical conception of 

 science which he had set forth in his inaugural address, " Concerning 

 the Need of Physiology for a Philosophic Consideration of Nature." 

 Verworn further laments that modern science has now so largely lost 

 this element of philosophy, which it had gained as a result of Miiller's 

 treatment. 



Having dealt thus far with the more abstract phase of Miiller's 

 activity and thought, let us now consider more concretely, for a few 

 moments, first the extent of the realm over which Miiller exercised so 

 marvelous a command. 



When we examine the list of 260 and more complete publications 

 which have come from Miiller's pen, we are better able to comprehend 

 the universality of his activities; and it must be understood in this 

 connection that in this great number there are few which represent 

 merely a superficial dalliance with a possible line of investigation. 

 They demonstrate, in almost every case, that Miiller plunged boldly into 

 the very heart of the matter which at the time received his fullest 

 consideration. The main subjects to which his contributions apper- 

 tain, include the following : 



1. The Physiology of Motion. 



2. The Life of the Foetus, 



3. The Sense Organs. 



4. Dissection of Invertebrates; also 



(a) their development, 



(b) the histology of their tissues. 



5. Nerve Physiology. 



6. Animal Chemistry. 



7. Human Anatomy. 



8. Ethnography. 



9. Comparative Anatomy of Vertebrates. 



10. Physiology of the Voice and Speech. 



11. Pathological Anatomy. 



12. Systematic Zoology. 



13. Paleontology. 



It is clear that such an extent and variety of undertakings could 

 not result from a single line of investigation, but required a universal 

 activity which it is safe to say has never been equaled by any investi- 



