HUMAN LIFE 



to claim a breaking away from the 

 quadrumanous group much higher up in 

 its series, seeing in the anthropoids and 

 man the latest and highest two diverging 

 branches in the tall genealogical tree of 

 human ancestry. That anthropoid and 

 human structure are too fundamentally 

 and minutely similar to be coincidence or 

 anything else than true homology, and 

 hence indisputable evidence of a common- 

 ness of origin, the biologist simply accepts 

 as a biological fact without regard to his 

 feelings of friendliness or unfriendliness 

 for chimpanzees and their immediate 

 relatives. 



I This structural evidence of ancestral 

 relationship between the anthropoids and 

 man is, of course, added to by several 

 other well-known kinds of likenesses, 

 physiological, psychological, and even 

 ecological. The similarity of the chemical 

 character of the blood of the two groups 

 as evidenced by the identity of its re- 

 actions in the face of certain stimulation, 

 the so-called precipitin reactions, these 

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