39 



THE POPULAR SCIENCE MONTHLY. 



Fig. 1. White-bearded Slender Monkeys. 



which is sufficient, 

 in my opinion, de- 

 spite some special 

 differences, to char- 

 acterize them as 

 closely related. This 

 peculiar structure 

 of the stomach, un- 

 precedented in a 

 monkey, naturally 

 induces the pre- 

 sumption of a pe- 

 culiar method of 

 feeding, and in- 

 deed shows indubit- 

 ably that the slen- 

 der monkeys and 

 the short-thumbed 

 monkeys are more 

 fully and exclusive- 

 ly vegetable feeders, 

 or, to be more exact, 

 greens-eaters, than 

 the other monkeys. 

 This inductive con- 

 clusion is fully con- 

 firmed by observa- 

 tion of the animals 

 in captivity. Our 

 representative of 

 the short - thumbed 

 monkeys, the guere- 

 zas, as well as the 

 two species of short- 

 thumbed monkeys 

 which I have tamed, 

 eat regularly but 

 daintily of the hay 

 that serves them for 

 straw and bedding, 

 and the guerezas eat 

 with particular rel- 

 ish the heads of 

 green salad which 

 they have learned to 

 expect eagerly for 



