38 
JIEMOIK OP CASIPER. 
peculiarities presented in this organ by these ani- 
mals was not then known, and I Iiad 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, an*l I 
then discovered, that, in most of the s|)ecies, there was 
a ])erfect resemblance in this peculiarity, though there 
were a few in whom it did not exist. I then, too, 
found that Galeti’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 
tu’o last centuries allude to the structure I am 
about to describe. Buffou 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 
IMandril, I could discover there was a great cavity 
in the neck, which could be filled with air, and wliicli 
tlien sw'elled up above the breast bone. Raising the 
sitperficial parts with care, I observed this pouch be- 
