ORDER QUADRUMANA. 339 



made of these animals, prepared the way for labours of 

 the same description, more extensive, and more satisfactory 

 as being commensurate with the progress of discovery and 

 the enlargement of natural knowledge. 



Erxleben, in his " Systema Regni Animalis" published in 

 1778, divided the monkeys into five genera, which we pre- 

 sent to the reader in the following order, with their princi- 

 pal characteristics. 



1. Simia. No tail. 



The Orang-Outangs and many Guenons. 



2. Papio. Short tail. Cheek-pouches. 



The Baboons. 



3. Cercopithecus. Long-tail, not prehensile, Callous 

 posteriors. 



The Ouanderou, the Macaques, &c. 



4. Cebus. Prehensile tail. Hairy buttocks. 



The Alouattes, the Sapajous, &c. 



5. Callithrix. Long tail, not prehensile. 



The Sakis, Sagoins, &c. 



But in modern times the men to whom natural science 

 is most deeply indebted, those whose researches have really 

 the character of originality, are Cuvier, Geoftroi, Lacepede, 

 and Audebert. There is a paper in the Journal de Physique 

 entitled " A Memoir on the Orang-Outangs," from the pens 

 of our illustrious author and M. Geoffroi, replete with the 

 most valuable observations on the subject now under consi- 

 deration, which has served, and must always serve, as the 

 basis of every subsequent classification of the numerous 

 and varied family of the monkeys. As we have no doubt 

 but that our readers will thank us for its insertion, and as 

 it is calculated to throw a more complete light on the sub- 

 ject of the present volume, we have translated it entire. 



" The monkeys, those singular beings, in whose forma- 

 tion nature would seem to have amused herself in rudely 

 caricaturing the human figure, have sometimes embarrassed 



