24 
LECTURE VII. 
and no longer feeds on vegetable but on animsil 
food, preying on the smaller kind of insects and 
worms. It does not arrive at its full size till at 
least five years old, and is supposed to live about 
fifteen. 
The Frog which is so frequently eaten in 
many parts of the Continent is a different species, 
rather larger and of a greener colour, spotted 
with black, and with two pale yellow lines down 
the back. Those however who collect the Frogs 
for the purpose of the table are known not to be 
very scrupulous in their choice, and it is acknow- 
ledged that not only Common Frogs but even 
Toads also are often intermixed with the green 
ones. 
Such animals of this genus as are of a heavier 
or thicker form than the rest, with shorter limbs, 
and which rather crawl than spring, are called 
Toads. Of these the Rana Bufo or Common 
Toad is the principal European species. Its 
changes are similar to those of the Frog, but 
the eggs from wliich its tadpoles proceed are not 
deposited in the form of clustered heaps, but in 
that of long double strings, bearing the appear 
ance of so many necklaces. The Common Toad 
