. The mechanistic conception of life; biological essays. Life; Biology. 98 The Mechanistic Conception of Life determined by the same mechanical forces which determine growth in plants. An obstacle to such a conclusion seems to lie in the fact that many plant-cells have solid walls, while this is not the case in most animal cells. The solid cell-wall, however, does not determine the peculiar character of growth. This character is determined first, by chemical processes within the cell, which result in a higher osmotic pressure, and, secondly, by the osmotic qualities of the outer layer of proto
. The mechanistic conception of life; biological essays. Life; Biology. 98 The Mechanistic Conception of Life determined by the same mechanical forces which determine growth in plants. An obstacle to such a conclusion seems to lie in the fact that many plant-cells have solid walls, while this is not the case in most animal cells. The solid cell-wall, however, does not determine the peculiar character of growth. This character is determined first, by chemical processes within the cell, which result in a higher osmotic pressure, and, secondly, by the osmotic qualities of the outer layer of protoplasm, which. Fig. 33.—Curve representing the influence of diluted sea-water. The abscissae represent the concentrations, the ordinates the corresponding growth in the unit of time. The maximum growth is at a concentration between 2 and 3 ger cent of salt, while the normal concentration is indicated lay the vertical line etween 3 and 4. allows water to pass through freely, but does not allow all salts dissolved in it to do the same. Both these qualities are inde- pendent of the solid cell-wall, and I see no reason why the animal cell should not agree in these two salient features with the plant-cell. In order that the foregoing explanation of the mechanism of growth in the animal cell might be based only upon known pro- cesses, it was necessary to find out whether, in case of growth, chemical processes of such a character take place that substances of higher osmotic pressure are formed than those from which they originate. Everyone knows that by exercise our muscles increase in size. No satisfactory explanation of this fact has. 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 Loeb, Jacques, 1859-1924. Chicago, University of Chicago Press
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