96 
NATURAL HISTORY 
FROG. 
If we emerge from the deep, the first and 
most obvious class of amphibious animals 
that occur upon land, are frogs and toads. 
To describe the form of animals so welt 
known would be superfluous ; to mark those 
differences which distinguish them from each 
other may be necessary. The Frog moves 
by leaping ; its colour is brighter and of a 
more polished surface: the toad is brown, 
rough, and dusty. The Frog is light and 
active, and its belly is comparatively small. 
The toad, on the other hand, is slow, swol- 
len, and incapable of escape. The Frog, 
when taken, contracts itself so as to have a 
lump on its back j the toad’s back is straight 
and even. The Frog is the best swimmer 
of all four-footed animals. 
