. Botany for high schools and colleges. Botany. CHLOROPHYLL, 51 06.—With few exceptions chloropliyll is not found in cells wtich are not exposed to the action of light.* When ordi- nary green plants are removed for some time from the light, the chlorophyll disappears from the chlorophyll-bodies, and leayes them colorless. The same decoloration also takes place when a plant is deprived of iron as one of the constituents of its food. The disappearance of chlorophyll takes i3lace normally in higher plants when the cells lose their activity. In the case of leaf- cells, upon the approach of autumn
. Botany for high schools and colleges. Botany. CHLOROPHYLL, 51 06.—With few exceptions chloropliyll is not found in cells wtich are not exposed to the action of light.* When ordi- nary green plants are removed for some time from the light, the chlorophyll disappears from the chlorophyll-bodies, and leayes them colorless. The same decoloration also takes place when a plant is deprived of iron as one of the constituents of its food. The disappearance of chlorophyll takes i3lace normally in higher plants when the cells lose their activity. In the case of leaf- cells, upon the approach of autumn the chlorophyll appears to be re- moved to other portions of the plant. {a) The cells of many Palmellacem, and many zoospores—, of (Edogo- nium and VaucJieria—furnish good ex- amples of the coloration of nearly the whole body of protoplasm. In Zygnema the chlorophyll-bodies are stellate, and in Spirogyvd, spiral. In Vaucheria there are multitudes of roundish or slightly angular chlorophyll- bodies, which line the interior of the large cells. The chlorophyll in the leaves of many mosses may be easily studied, even without making sections; in them the chlorophyll-bodies are round- ish in outline. In the higher plants thin cross-sections of the leaves afford the best means for the examination of their Y\g. 42.—Two filaments of Spl' chlorophyll-bodies, which are uniformly rogyra longata; the chlorophy]! ,^ •; T 1 XI- "^ IS lu spiral bands; in the centro of a simple rounded outline. of each cell la a nucleus, with (&) Chlorophyll is soluble in alcohol, ^^<^i,^^^^S,/*""S^ ^^ protoplasm. , '^ , T - , . , T X 550.—After Sachs, ether, chloroform, benzine, essential and fatty oils, hydrochloric and sulphuric acids, and these may be used. * The cotyledons of many Coniferae acquire a green color even in total darkness. The embryo of Phoradendron is green in the unopened seed, and in certain seeds with thick coats, which are impervious to light (e.
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