Excerpt from The Annals and Magazine of Natural History, 1863: Zoology, Botany, and Geology The physics of the development and of the life of the cell, as the basis of all anatomy and physiology, constitute the first problem to be solved in both those sciences. Since Schwann declared that both animal and vegetable tissues consist of cells originally of a like nature, the similarity also in function of such cells both in animals and plants has been rendered more and more evident. A clear perception of the whole of the physico-chemical phenomena which by their union constitute life will only be attained by an accurate knowledge of the origin and growth of the cell. The formative elements of the cells which unite to constitute organic tissues have been largely investigated since the time when Robert Brown indicated the presence of a nucleus in numerous cells, and since I demonstrated that the cell-wall, previously regarded as a single sac, consists in reality of several endogenous superimposed lamina; (Karsten, De Celia vitali, 1843). 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.