. Animal life as affected by the natural conditions of existence. Animal ecology. 88 THE INFLUiTNCE OF INANIMATE S0KROUNUINGS. ento-parasites are quite, or almost quite, Vhite, appears a striking proof of the accuracy of this statement. Even as lately as 1870 it was asserted by the celebrated French depute and physiologist, Paul Bert, that the larvse of the well-known Axolotl (fig. 24) were incapable of forming pigment when they were brought up under the influence of yellow light, and he unhappily designated this absence of the epidermal pigment as ' etiolation.' This term, as is well known, h
. Animal life as affected by the natural conditions of existence. Animal ecology. 88 THE INFLUiTNCE OF INANIMATE S0KROUNUINGS. ento-parasites are quite, or almost quite, Vhite, appears a striking proof of the accuracy of this statement. Even as lately as 1870 it was asserted by the celebrated French depute and physiologist, Paul Bert, that the larvse of the well-known Axolotl (fig. 24) were incapable of forming pigment when they were brought up under the influence of yellow light, and he unhappily designated this absence of the epidermal pigment as ' etiolation.' This term, as is well known, has a £xed signi- fication in the physiology of plants; it is exclusively used to. Fig. 2i.—Siredon pitd/orme, the Mexican Axolotl. designate those cases of the absence of the green hue in plants wmch, having grown in the dark, have been checked -in the formation of the chlorophyll-bodies, which ai^e the organs by which they assimilate and elaborate their nutrition Tat the same time, as the light is no longer able to act as a check on their excessive growth, the leaves and stems become much elongated and acquire a yellowish-white hue, all of which phe- nomena can be easily observed in the shoots and leav^ of potato tubers which have begun to sprout in a cellar. In the cases of so-called ' etiolation' described by Bert as occurring in. 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 Semper, C. (Carl), 1832-1893. New York, D. Appleton
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