58 Chemical' Basis of Genus and Species 



Among the Primate bloods that of the Chimpanzee 

 gave too high a figure, owing to the precipitum being floc- 

 culent and not settHng well, for some reason which could 

 not be determined. The figure given by the Ourang is 

 somewhat too low, and the difTerence between Cynocepha- 

 lus sphinx and Ateles is not as marked as might have 

 been expected in view of the qualitative tests and the series 

 following. The possibilities of error must be taken into 

 account in judging of these figures; repeated tests should be 

 made to obtain something like a constant. Other bloods 

 than those of Primates give small reactions or no reactions 

 at all. The high figures (io%) obtained with two Car- 

 nivore bloods can be explained by the fact that one gave 

 a loose precipitum, and the other was a somewhat concen- 

 trated serum.' 



We have mentioned that even the proteins of the 

 egg are specific according to Uhlenhuth. Graham 

 Smith, one of Nuttall's collaborators, applied the lat- 



^ Nuttall, Blood Immunity and Blood Relationship, pp. 319 and 320. 



