SEXUAL SELECTION. 243 



spect between allied tribes on the same continent. So 

 again the raisers of fancy animals certainly have admired 

 for many generations and still admire the same breeds ; 

 they earnestly desire slight changes, which are considered 

 as improvements, but any great or sudden change is 

 looked at as the greatest blemish. With birds in a state 

 of nature we have no reason to suppose that they would 

 admire an entirely new style of coloration, even if great 

 and sudden variation often occurred, which is far from 

 being the case. We know that dovecot pigeons do not 

 willingly associate with the variously colored fancy 

 breeds ; that albino birds do not commonly get partners 

 in marriage ; and that the black ravens of the Feroe Isl- 

 ands chase away their piebald brethren. But this dis- 

 like of a sudden change would not preclude their appre- 

 ciating slight changes, any more than it does in the case 

 of man. Hence with respect to taste, which depends on 

 many elements, but partly on habit and partly on a love 

 of novelty, there seems no improbability in animals ad- 

 miring for a very long period the same general style of or- 

 namentation or other attractions, and yet appreciating 

 slight changes in colors, form, or sound. 



DIFFERENCE BETWEEN THE SEXES CREATED BY SEXUAL 

 SELECTION. 



r, ceo There can be little doubt that the great- 



1 age oo«>. . . ° . 



er size and strength of man, in comparison 

 with woman, together with his broader shoulders, more 

 developed muscles, rugged outline of body, his greater 

 courage and pugnacity, are all due in chief part to in- 

 heritance from his half-human male ancestors. These 

 characters would, however, have been preserved or even 

 augmented during the long ages of man's savagery, by 



