6o Actual Races in History. 



races are, after all, less different than races of a given 

 species in the lower kingdoms, vegetative or animal. 

 Hence, the inference stands confirmed that all 

 humanity has been of one species from the first, 

 and could have descended from one primitive pair. 

 This proves the identity of the human species from 

 the physical side. 



64. But the test above all is that direct one, a 

 physiological fact, which proves identity of species 

 everywhere, — the fertility of the human races, their 

 power of blending all over the world. Distinct 

 species refuse to blend; human races do not. Nor 

 do the latter deteriorate by blending, and die off in 

 sterility, as hybrids do (No. 133 below): on the con- 

 trary, they improve As a species, then, the races 

 of mankind agree in all the anatomical and physi- 

 ological characteristics which go to make one family. 



65. We should not omit their intellectual quali- 

 ties. Here the same unity is manifested in many 



lines of demonstration. There is lan- 



Intellectual 



Qualities: guage, which is necessarily and primar- 

 Speech. iiy a vehicle of thought from mind to 



mind — thought in its entire range of objects, 

 abstract and spiritual, as well as concrete and 

 material. This language or speech is a power in 

 which philology is but beginning to reveal the 

 beauties and hidden depths of intelligence con- 

 cealed under its forms, — a power which reflects as 

 a mirror the thoughts of our inmost soul right into 

 the soul of our fellow-creature ; singing in joy, 



