EVOLUTION THE MASTER-KEY 



of the blood stain and inject it into a dog. If 

 " hsemolysis " occurs, the blood cannot be canine; 

 if it does not, the blood must certainly be canine. 

 Now the astonishing and even bizarre fact is that 

 the blood of the anthropoid ape gives the charac- 

 teristic human reaction, while the blood of the 

 lower monkeys does not. In other words, the blood 

 of man and of the anthropoid ape are identical 

 when judged by this, the most subtle and delicate 

 of all known tests. 



To the evidence of anatomy in favor of man's 

 intimate relationship with the anthropoid ape there 

 has, therefore, been added that of comparative pa- 

 thology, of embryology, and of physiological chem- 

 istry. Many more facts might be adduced, such 

 as the recent discovery that a function hitherto 

 thought to be characteristic of the human female 

 is also displayed by the anthropoid ape. Hence- 

 forth he who doubts that man and the chimpanzee 

 have a common ancestor must be congratulated 

 on his inviolate mind. Facts have no terrors for 

 him. 



But here we may note a great reservation which, 

 in utter defiance of logic or the evidence, but in 

 accordance with their prepossessions, is made by 

 some who are prepared to admit the simian origin 

 of man's body. Chief of these is Mr. Alfred Russel 

 Wallace, who long ago distressed Darwin by de- 

 clining to accept the conclusion that man's mental 

 or psychical characters have ascended by the same 

 "base degrees" as his body. For their view there 

 138 



