708 



THE DESCENT OF MAN 



of the species the sexes resemble eacli other in color, but 

 in some, as we have seen, the males differ from the females, 

 especially in the color of the naked parts of the skin, in the 

 development of the beard, whiskers, and mane. Many spe- 

 cies are colored either in so extraordinary or so beautiful a 

 and are furnished with such curious and elegant 



manner- 



crests of hair, that we can hardly avoid looking at these 



Fio. 78.— Head of Semnopithecus rubioundas. This and the following figures 

 (from Prof. Gervais) are given to show the odd arrangement 

 and development of the hair on the head. 



characters as having been gained for the sake of ornament. 

 The accompanying figures (Figs. 72 to 76) serve to show the 

 arrangement of the hair on the face and head in several spe- 

 cies. It is scarcely conceivable that these crests of hair, and 

 the strongly contrasted colors of the fur and skin, can be the 

 result of mere variability without the aid of selection; and 

 it is inconceivable that they can be of use in any ordi- 



