28 
CLASSES OF ANIMALS. 
fine our attention to the first-mentioned. 
What was it?” 
“ Vertebrata,” said Sidney and Annie 
together. 
“This department is divided into four 
classes,—mammals, or those which suckle 
their young, birds, reptiles and fishes. 
Now, to which department does our pussy 
belong?” 
“The first,” said Annie; “because she 
has a backbone.” 
“And to which class?” 
“Mammals,” said Dick; “because cats 
suckle their kittens.” 
“Very good, so far. This class is sub¬ 
divided again into twelve orders, which are 
often included in three, namely, Carnivora, 
or those which eat flesh, often called, also, 
beasts of prey; Herbivora, or those which 
eat vegetable food; and Cetacia, or warm¬ 
blooded animals living in the water, as 
whales.” 
“I thought whales were fish, anyhow,” 
said Sidney. 
“No more than lobsters are,— nor so 
much. How, then, will you locate our pussy, 
