Excerpt from An Introduction to Zoology, Vol. 2 of 2 In consequence of their small amount of respira tion, Reptiles are cold-blooded; that is, their blood is scarcely warmer than the temperature of the at mosphere at any given time. They, therefore, do not need such a covering as hair, wool, or feathers, to retain animal heat; and for defence a naked skin is sufficient, which in some is hardened into horny plates, or scales. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.