250 ELEMENTS OF SCIENCE 



kind natural to that sea. Setters bred at Delhi and 

 cats at Mombas in Africa have been known to undergo 

 quickly, or in a generation, considerable modifications, 

 while twenty kinds of American trees all differ from their 

 nearest European allies in a similar manner less toothed 

 leaves, fewer branchlets, &c. 



We have now briefly indicated some main facts which 

 concern living creatures, and pointed out the principal 

 circumstances whereby they differ from the non-living 

 world. 



We must next direct our attention exclusively to that 

 highest of all living creatures which people this earth 

 our own species, Man. 



