NERVOUS SYSTEM OF VERTEBRATES. 



STEM. 



ns which stands 

 iy. The study 

 an examination 

 )mponent parts 

 lations to other 

 •al connections 

 nerve impulses 

 " organs and in 

 3 more general 

 id other organs 

 relations of the 

 ;rmined by the 

 brate organism, 

 .e of hfe is the 

 controlhng prmciple; ana oy ine conuuiuiib ui cmoryonic develop- 

 ment, in which special structures adapted to the embryonic mode 

 of life and inherited structures adapted to ancestral modes of 

 life play important parts. The student who wishes to gain a 

 knowledge of the nervous system is of necessity thrown into this 

 maze of complicated relationships, but fortunately he finds 

 methods of investigation adapted to the problems to be solved. 

 While the student may direct his attention especially to the phase 

 of structure or the phase of function, he should understand from 

 the outset that great progress and permanent results are to be 

 attained only when the study of structure and the study of function 

 go hand in hand. While in general the detailed study of structure 

 must precede the detailed study of function, the interpretation 



