142 Brain : 



thousand years, — a period of time relatively brief when 

 considered in comparison with the developmental epoch of 

 mammals. 



Prehistoric skulls are smaller and less prominently de- 

 veloped, frontally, than those of our own epoch. The 

 same general truth is exemplified when the skulls of ex- 

 istent savage tribes are compared with those of individuals 

 from the highly civilized and progressive nations ; there is 

 less of that higher frontal development in savages, which 

 we always find associated with the growth of intellect, and 

 this even in instances of large individuals, where the skull 

 is very massive and capacious. Acquired knowledge and 

 the sciences tend constantly to increase the bulk of the 

 brain and modify its form ; in a word, to render it a pro- 

 gressive tissue. 



This proposition is still more grandly exemplified when 

 the evolution of life on the earth is contemplated as a 

 whole. In early metazoic life, brain was scarcely more 

 than initiated. The lower vertebrates have small brains. 

 But in the quadrumana the human brain is found to be 

 outlined in type and form. From this order of mammals 

 the progress of the human brain can be readily traced. 



Nor can it be doubted, even although our microscopes 

 fail to show the fact, that the brain tissue is receiving a 

 progressive, internal development, corresponding to the 

 intellectual growth of humanity. 



For the human brain to-day is the protoplasmic corela- 



