io Permanence and Evolution. 



customed to find between forms classed as 

 species, he forthwith made them one species, 

 taking the purely morphological ground of 

 determination founded on a certain unde- 

 termined degree of likeness. Thereupon he 

 supposed those Eastern races to be of one 

 origin, and the descendants of escaped domestic 

 pigs. So the eminent anatomist John Hunter 

 supposed the dog, the wolf, and the jackal to be 

 necessarily descended from one stock, because 

 the dog would breed with both the other two, and 

 the offspring would breed again with the dog ; 

 whilst, on the other hand, the so-called splitters 

 start from some other point in the definition of 

 species, as distinct existence in a wild state, for 

 example, and sink the morphological side of the 

 notion altogether, and with it the aesthetic 

 symmetry of a natural system. In disquisitions 

 as to the specific unity of domestic breeds, 

 species means little more than wild stock. 



I think it would be best, in the present imper- 



