2 NATURAL HISTORY ESSAYS 



so sheeted in muscle that the elevated mass over the 

 withers recalls the ruff of an Elizabethan courtier ; 

 but the waist is well defined and almost shapely ! 

 The tail is not reversed over the back as erroneously 

 depicted in books : on the contrary it projects 

 backwards at an angle of 45. The face is naked, and 

 the buttocks are almost so : in adult life a sausage- 

 shaped swelling is developed on each cheek, caused 

 by the inflation of the underlying maxillary bones. 

 The eyes are situated close together and deeply set 

 in the head ; the nostrils are slightly truncated ; the 

 mouth is large. A slight beard much less than one 

 would suppose from the illustrations in books ! adorns 

 the chin : while a semi-ruff of hair encircles the face 

 and a semi-mane bedecks the shoulders. There is 

 no crest of hair along the vertex, as stated in books : 

 on the contrary, the cranium of the adult drill is 

 remarkable for the flatness with which it slopes down 

 to the eyebrows. To this account add the colouring: 

 the brilliant hues of a bird of Paradise on the carcase 

 of a baboon produce an effect grotesque and hideous 

 in the extreme. The following is a description of 

 the coloration of an adult male : 



Face purplish black, glossy, finely granulated, and 

 margined throughout by a narrow edge of salmon 

 colour which extends right up each side of the 

 greenish black forehead. Sausage-shaped inflations 

 on the cheek coppery brown above, purplish black 

 below. Lower lip black, margined by a band of 



