. Une introduction à la physiologie végétale. Physiologie végétale. 62 phénomènes Physiologie végétale dans l'usine diffère de tout qui peut être utilisé en laboratoire en un point important, qui modifie le processus d'une manière fondamentale. Il est vivant, et exerce un contrôle sur le processus. Il se compose d'une cellule- mur, sur chaque face de qui est une fine couche ou couche de la substance vivante. Ce dernier est plus complexe que la membrane semi-perméable, pour son comportement peut varier de temps en temps et ainsi de réguler l'entrée de liquide et des substances dissoutes, de déterminer non seulement

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. An introduction to vegetable physiology. Plant physiology. 62 VEGETABLE PHYSIOLOGY phenomena in the plant differs from any that can be used in the laboratory in one important point, which modifies the process in a fundamental way. It is alive, and exercises an active control over the process. It consists of a cell- wall, on each face of which is a thin film or layer of the living substance. The latter is more complex than the ordinary semipermeable membrane, for it can vary its behaviour from time to time and so regulate the entry of substances both liquid and dissolved, determining not only what shall pass through, but to a large extent in what con- centration they shall pass. In this way the absorption. Fio. 51.—Vegetable Cells. A, very young; B, a little older, showing commencing formation of vacuole, p, protoplasm ; n, nucleus; v, a vacuole. of a particular salt by the vegetable cell is not necessarily in the proportion of its osmotic pressure. We can apply the osmotic process to explain the original formation of the vacuole. Consider the case of a young non-cuticularised cell of the external layer of a plant which is immersed in water. It is full of protoplasm, and limited or clothed by a cell-membrane which is permeable more or less readily by water. The protoplasm is saturated with water, but there is no separate accumulation of the latter in its interior. Part, at least, of the cell-wall is in contact with water on the outside. The protoplasm is actively living, and in the course of the chemical changes which are incidental to vital action certain substances are produced by it, which, like the syrup in the experiment first described, . 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 work.. Green, J. Reynolds (Joseph Reynolds), 1848-1914. London, J. & A. Churchill

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