Excerpt from Manual of Botany Comprising Vegetable Anatomy and Physiology, or the Structure and Functions of Plants: With Remarks on Classification III. In examining animals or vegetables, with the view of acquiring a correct knowledge of them, it is not suffi cient to take note of their external appearance, inspect their organs in a superficial manner, watch the changes which gradually take place in them, or Observe their motions and habits. These changes and actions result from their internal structure, and, before we can under stand them aright, we must make ourselves acquainted with that structure. Two sciences, or branches of science, take cognizance of the mechanism and functions Of the organs of animals and plants. That which has reference to the form, structure, and disposition of the organs, is named anatomy; while to physiology belong their functions, or the offices which they perform. We have thus, in Zoology, the distinct, but connected branches of zoological anatomy or zootomy, and animal physiology; and in Botany the corresponding depart ments of vegetable anatomy or phytotomy, and vege table physiology. These sciences, when applied to the entire series of animals, or to that of plants, with the view of discovering their similitudes, discrepancies, and relations, of disclosing the modifications of their various organs, the laws which determine the mutual relations of these organs, and the connection between the form, habits, and external circumstances of the objects examined, assume the names of comparative anatomy and physiology. 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.