. Elementary anatomy and physiology : for colleges, academies, and other schools. Anatomy; Physiology. AND PHYSIOLOGY. 21 65. It is in these ways that most of the tissues of the body are built up, and the animal enlarges to its full size. It has been maintained that all the tissues orig- inate in cell develop- ment. But, in some cases, simple fibers and membranes seem to be formed directly out of an organizable s u b - stance, without the in- tervention of cells. 66. Vital Force of Cells; Chemical Trans- formations; Vitalization of Hie Cells; Change of Form; Development of Nerve Force.—The mul
. Elementary anatomy and physiology : for colleges, academies, and other schools. Anatomy; Physiology. AND PHYSIOLOGY. 21 65. It is in these ways that most of the tissues of the body are built up, and the animal enlarges to its full size. It has been maintained that all the tissues orig- inate in cell develop- ment. But, in some cases, simple fibers and membranes seem to be formed directly out of an organizable s u b - stance, without the in- tervention of cells. 66. Vital Force of Cells; Chemical Trans- formations; Vitalization of Hie Cells; Change of Form; Development of Nerve Force.—The multiplication of cells is one of the manifestations of the vital force inherent in tham. Another is the chemical transformations exerted upon the con- tents of the cell in some instances, whereby new products are generated. Another is the vitalization of a portion of the cell contents, whereby they are able to produce new . cells. Another is permanent changes of form in connection with growth. Another is temporary changes of form, ac- companied with sensible motion, as in the oscillatory move- ments of the leaves of Hedysarum gyrans. and the fold- ing of the leaves of the Mimosas upon touch. Finally, the development of nerve force from cells, by which all the bodily operations may be modified, and which is intimately connected with mental agency. 67. Periods in the Life of the Cells.—In cell life there is a Fig. 65. Show how the tissues of the body are made up. 66. Mention the different changes which cells 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 Hitchcock, Edward, 1793-1864; Hitchcock, Edward, 1828-1911. New York : Ivison, Phinney, Blakeman & Co. ; Chicago : S. C. Griggs & Co.
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