HEREDITY 



His results made this so probable that 

 Professor Geo. H. F. Nuttall, F.R.S., of 

 the University of Cambridge took the 

 subject up, and has so extended its appli- 

 cation that a single drop of blood from 

 any animal now suffices not only to show 

 by its peculiar chemical reactions what 

 animal it comes from, but also how nearly 

 related, or the opposite, an animal is by 

 his blood to other animals. It begins, 

 therefore, to look as if the whole classi- 

 fications of zoology may have to be re- 

 arranged according to these blood tests. 

 Thus, a drop of the blood of a walrus 

 shows no relation with a drop of whale's 

 blood, or of the blood of any other ceta- 

 cean, such as seals or porpoises, which, like 

 the walrus, are mammals that have taken 

 to the sea. Instead of that, the blood of 

 the walrus immediately reacts with the 

 blood of horses, asses, and zebras, thus 

 proving that he is an equine that no longer 

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