Excerpt from Anatomy of Vertebrates, Vol. 2 The evolution of animal heat more directly relates to the amount of air inspired in a given period, and to the rapidity with which the oxygenated blood is conveyed to the tissues. In these the molecular changes are governed by the nervous system, and whatever tends to paralyse the nervous force operates in the same degree in arresting those molecular movements on which more directly depends the evolution of heat. In this act the nervous system is accordingly concerned, in so far as it influences the exercise of the muscular movements. 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.