532 



The Descent of Man. 



Part II. 



monkeys attack each other by the throat ; but it is not probable 

 that the beard has been developed for a distinct purpose from 

 that served by the whiskers, moustache, and other tufts of hair 

 on the face ; and no one will suppose that these are useful as a 

 protection. Must we attribute all these appendages of hair or 

 skin to mere purposeless variability in the male ? It cannot be 

 denied that this is possible ; for in many domesticated quad- 

 rupeds, certain characters, apparently not derived through re- 

 version from any wild parent-form, are confined to the males, 



Fig. 68. 



Pithecia satanas, male (from Brehm). 



or are more developed in them than in the females — for instance, 

 the hump on the male zebu-cattle of India, the tail of fat-tailed 

 rams, the arched outline of the forehead in the males of several 

 breeds of sheep, and, lastly, the mane, the long hairs on the 

 hind-legs, and the dewlap of the male of the Berbura goat. 18 The 

 mane, which occurs only in the rams of an African breed of 



,s See the chapters on these ' Variation of Animals under Domes- 

 several animals in vol. i. of my tication ; ' also vol. ii. p. 73 ; also 



