of graminivorous and carnivorous Animals. i6g 
the other glandular structures are similar to those in the ass 
and rat, only more conspicuous. 
It is deserving of remark, that the internal structure of the 
stomachs fitted for digesting vegetable substances, corres- 
ponds much less with the kind of teeth, than it has been gene- 
rally supposed to do. The animals with chissel teeth have no 
uniformity in the structure of their stomachs ; those of the 
beaver and dormouse being of one kind ; the hare’s and 
rabbit’s of another ; the squirrel’s of a third, resembling that 
of the monkey ; the guinea pigs of a fourth, differing from that 
of the squirrel, in there being a greater disproportion between 
the thickness of the coats of the cardiac and pyloric portions ; 
the rat tribe of a fifth, which resembles the stomach of the 
horse and ass, animals whose teeth have a very different form. 
On the other hand, all the ruminants with horns have one 
structure of stomach ; all those with fighting teeth another, 
as has been observed in a former paper ; also all the animals 
with projecting tusks have the pouches at the cardia, which 
appear to be peculiar to them, although there is no connexion 
we yet know of between these weapons of defence and the 
stomach. 
As the elephant’s grinding teeth are the best fitted for pre- 
paring vegetable food for digestion, so the stomach in its struc- 
ture approaches nearer to those of carnivorous animals. 
The stomachs whose structure has been hitherto considered 
belong to animals that feed on vegetables, and chiefly on the 
leaves, roots, and branches of plants. In the gradation towards 
carnivorous stomachs, we are next to take notice of those 
that belong to animals whose principal food is the fruits of 
trees,. which appear to require less preparation for the process. 
