APES AND MONKEYS. 



313 



till late in the evening, seeks constant occupation, and when he 

 comes to an end of his usual employments he invents new ones, 

 even if it should only be slapping his feet with his hands, or knock- 

 ing against hollow boards, and thus producing sounds which give 

 him evident pleasure. In a room he occupies himself with carefully 



Fig. 48. -Chimpanzee (Troglodytes niger). 



examining everything that attracts his attention, opens drawers and 

 rummages among their contents, opens the stove door to look at the 

 fire and shuts it again, holds a key properly, stands before the 

 mirror and amuses himself with the reflection of his own gestures 

 and grimaces, uses brush and duster as he has been taught, puts on 

 blankets and clothing, and so on. 



His acuteness of observation is strikingly proved by his almost 

 unfailingly correct judgment of persons. Not only does he recog- 



