9 o PHYSICAL BASIS OF CIVILIZATION 



man's growing intelligence had already become an 

 important element in his make-up, on which his 

 survival depended. 



Thus the conclusion is reached that those same 

 slight structural changes in the ento -cuneiform bone 

 in the foramen magnum, on which the upright atti- 

 tude depends, which brought so many evils upon 

 our two-footed brute ancestors, were the efficient 

 agencies to force the wonderful growth and manifold 

 expansion of the primitive intelligence with which 

 they were originally endowed. See Appendix Note 

 I, on articulate speech. 



