128 READINGS IN EVOLUTION, GENETICS, AND EUGENICS 



necessitated a remodeling of the skull. On the other hand, the 

 skeleton, limbs, hands and feet are but slightly specialized. In the 

 elephant tribe, so far as we can trace them back in tune, there has 

 been little change, save in size, in the structure of the body or limbs, 

 while the teeth and skull have passed through a series of remarkable 

 changes. It is for this reason that it is unsafe to found a scheme of 

 classification, which is meant to be a brief expression of relationship, 

 upon a single character, for the result is almost invariably misleading. 

 The results of blood tests must be critically examined and checked by 

 a comparison with the results obtained by other methods of investiga- 

 tion, but after every allowance has been made, these tests are very 

 remarkable. 



The blood tests have brought very strong confirmation to the 

 theory of evolution and from an entirely unexpected quarter; they 

 come as near to giving a definite demonstration of the theory as we 

 are likely to find, until experimental zoology and botany shall have 

 been improved and perfected far beyond their present state. 



