The Cytoplasm of the Plant Cell (Classic Reprint)

Bücher

Angebote / Angebote:

Excerpt from The Cytoplasm of the Plant CellWhile these conceptions were being established, the works Of von mohl meyen and nageli were proving the inexactitude Of schleiden s theory of cell origin and showing that cells multiply by division. Thus the word cell (french cellule, from the Latin cellula, little room) came to mean the contents of the cellular cav ity, a significance quite different from that given it by hooke, who Observed only the walls.From then on, the conception Of the cell was enlarged upon but the knowledge of its structure, making only slow progress, was to remain Obscure for a long time. The early cytologists observed only living cells. This presents serious difficulties, for, with the exception of unicellular organisms, Observation of living material can be carried out only after tearing or sectioning tissue, operations which risk injuring the cells. Cells examined in a medium not their own water, for instance may, during Observation, undergo serious alterations. Lastly, observation of living material never allows the study of cell structure to be pushed sufficiently far, be cause, except for cases which are unusually favorable, the different elements which constitute the cell Show too small differ ences of refractivity for it to be possible to distinguish one from the other with clearness, and this becomes, moreover, well nigh impossible in embryonic tissue in which the cells are very small.About the PublisherForgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.comThis 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.