182 EVOLUTION AND SOCIAL PROGRESS 



In the first place, nothing new is really pre- 

 sented from an argumentative standpoint; we 

 know already that there are striking resemblances 

 in skeleton and bodily structure between apes and 

 man, and if we now learn that there is similarity 

 also in the fluids that circulate in their bodies, we 

 are not surprised at all. It seems reasonable to 

 expect it, granting a Divine design. But these 

 chemical tests are not as infallible as is sometimes 

 believed; Brumpt for instance found from his 

 experiments with blood infected through sleeping- 

 sickness that certain reactions were presented by 

 apes; but these same reactions were presented 

 also by certain kinds of pigs ! Raehlmann, more- 

 over, found certain peculiarities in human blood 

 that are not found in any other vertebrate. The 

 conclusion of Prof. W. B. Scott is the only safe 

 statement we can make. After mentioning that 

 blood-tests would show a closer relationship, ap- 

 parently, between parrots and ostriches than be- 

 tween wolves and hyenas, he says: "It is unsafe 

 to found a scheme of classification upon a single 

 character, for the result is almost invariably mis- 

 leading. The results of blood-tests must be criti- 

 cally examined and checked by a comparison with 

 the results obtained by other methods of investi- 

 gation." 6 



6 'Theory of Evolution," p. 80. 



