INTRODUCTION". 
ixsi 
tipper jaw, but several, viz. six or eight in the 
lower ; their feet are furnished with cloven, or 
divided hoofs ; theit food is entirely vegetable, and 
they possess the remarkable power of rumination, 
or throwing up again into the mouth the food they 
have first swallowed, in order that it may be still 
further reduced, or comminuted by the teeth. This 
remarkable process is assisted by the peculiar struc- 
ture of the stomach, which, in these animals, is di- 
vided into four cavities, each having its peculiar 
office. 
The bell use have obtuse front teeth ; the feet 
are furnished with hoofs, in some whole, or round- 
ed, in others obscurely lobed or subdivided ; their 
food is vegetable. 
The cete consists of the whales, which, though 
resembling fishes as to general form or outline, are 
real mammalia in disguise ; having similar bones, 
lungs, teats, &c. &c. Their teeth are frequentty 
less osseous than in other mammalia. They feed 
on soft marine animals and vegetables, and swim 
chiefly by means of their pectoral, or breast fins, 
in which are inclosed the bones of the fore feet. 
Their tail is horizontal, and they are furnished 
with breathing holes on the top of the head, through 
which they occasionally spout the water. 
