3B MEMOIR OF CAMPERr 



peculiarities presented in this organ by these ani- 

 mals was not then known, and I had never seen any 

 allusion to it in any work on anatomy. When I 

 went to Amsterdam, I had abundant opportunities of 

 prosecuting my researches in these matters, and I 

 then discovered, that, in most of the species, there was 

 a perfect resemblance in this peculiarity, though there 

 were a few in whom it did not exist. I then, too, 

 found that Galen's general description of this organ 

 corresponds neither with what is found in man, nor 

 with that which I am about to mention. Tyson's 

 mark, also, that the organ of voice in the orang- 

 outang, or pigmy, which he had examined, was ex- 

 actly similar to that of man, only prompted me to 

 renewed research. None of the anatomists of the 

 two last centuries allude to the structure I am 

 about to describe. Buffon does not, nor does Dau- 

 benton, although it is not easy to conceive how it 

 escaped them. 



" On opening the throat of an African monkey, I 

 discovered, immediately under the skin, a pouch, 

 which I traced into the bone at the root of the 

 tongue the os hyoides. It had an oval form, and 

 could easily be inflated with air. I found it com- 

 municated with the throat, by a small chink at the 

 base of the epiglottis. Again, in dissecting a great 

 Mandril, I could discover there was a great cavity 

 in the neck, which could be filled with air, and which 

 then swelled up above the breast bone. Raising the 

 superficial parts with care, I observed this pouch be- 



