. Biology. Biology. CELL STRUCTURE 27 that this living substance, which he called 'sarcode," is a simpler form of living matter than that which composes the bodies of higher animals or plants. It was not until 1863 that protoplasm and sarcode were shown, by Max Schultze, to be the same type of substance. In the meantime research on the finer structure of different animals and plants extended the cell theory of Schleiden and Schwann to form after form, while the older view that the walls are the essential parts was gradu-. FIG. 12.—General view of cells composing the growing root-tip of an
. Biology. Biology. CELL STRUCTURE 27 that this living substance, which he called 'sarcode," is a simpler form of living matter than that which composes the bodies of higher animals or plants. It was not until 1863 that protoplasm and sarcode were shown, by Max Schultze, to be the same type of substance. In the meantime research on the finer structure of different animals and plants extended the cell theory of Schleiden and Schwann to form after form, while the older view that the walls are the essential parts was gradu-. FIG. 12.—General view of cells composing the growing root-tip of an onion; some cells in stages of division (mitosis, see p. 209). 0, Non-dividing cells; b, early stages of nuclear change; c, cells in full mitosis. (From E. B. Wilson.) ally replaced by the modern conception of protoplasm and cell structure. It thus follows that the term cell, meaning originally an empty box, then a framework with fluid contents, has come to mean finally a small unit mass of living material, while the cellu- lar structure of all living things has no longer the uncertain standing of a theory, but is one of the fundamental and firmly established facts of Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Calkins, Gary N. (Gary Nathan), b. 1869. New York, H. Holt and company
Size: 1894px × 1320px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookaut, bookpublishernewyorkhholtandcompany, booksubjectbiology
