EVIDENCES OF EVOLUTION 63 



The blood-serum of a rabbit which has had 

 human blood injected into it forms a precipi- 

 tate with human blood. It forms almost as 

 marked a precipitate when it is added to the 

 blood of an anthropoid ape. As Schwalbe 

 sums up in the recent Darwin centenary 

 volume: "The reaction to the blood of the 

 lower Eastern monkeys is weaker, that to the 

 Western monkeys weaker still; indeed, in 

 this last case there is only a slight clouding 

 after a considerable time and no actual 

 precipitate. The blood of the Lemuridse 

 (Nuttall) gives no reaction or an extremely 

 weak one, that of the other mammals none 

 whatever. We have in this not only a proof 

 of the literal blood-relationship between man 

 and apes, but the degree of relationship with 

 the different main groups of apes can be 

 determined beyond possibility of mistake." 

 Man as Transformist. — It is time, how- 

 ever, to pass from the laboratory to the breed- 

 ing-pen and experimental plot, to recall the 

 very striking transformations that man, by 

 selective breeding, has effected in his domesti- 

 cated animals and cultivated plants. Dar- 

 win pointed to what has taken place in the 

 case of sheep and cattle, cabbages and apples, 

 and a score of other cases, and pressed home 

 the question: If Man has been instrumental 

 in fixing all these varieties in a short time. 



