Hydration and Growth (Classic Reprint) - Hardcover

Macdougal, D. T.

9780266233602: Hydration and Growth (Classic Reprint)

Hardcover

ISBN 10: 0266233600 ISBN 13: 9780266233602

Publisher: Forgotten Books, 2019

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Excerpt from Hydration and Growth

Growth consists in increases in volume of masses of living matter, usually but not invariably accompanied by accretions of material other than water to the colloids of the protoplasm. Auxetic changes in members, organs, or cells of the larger plants may be readily deter mined by external measurements, and the greater part of the available information concerning the subject has been obtained in this manner. Many generalizations, however, rest upon data secured by taking the gross weight of organisms; in other cases the dry weight is used as a criterion, a method which obviously may be used only in securing end or total results. A count of the number of individuals may afford a reliable basis for the estimation of the rate of growth and multiplica tion of unicellular organisms such as bacteria, in which the limits of enlargement of the individual are quickly reached. Much of the value of the results presented in the present volume is to be attributed to methods by which the varying dimensions of organs and of individual plants were followed not only through the entire period of develop ment, but alterations accompanying maturity were measured with some precision. The information thus secured made it possible to interpret the effects of the ever-changing daily complex of environic fac tors and to evaluate to some extent the effects of previous experience upon the behavior of a growing organ at any stage of its development.

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