Archive image from page 119 of The cytoplasm of the plant. The cytoplasm of the plant cell cytoplasmofplant00guil Year: 1941 ? 3 ' - 4 Fig. 72 (left). — Chondriome of antherozoids of Adiantum capillus-Veneriii. 1, 2, antheridial initial. 3, 4, sperm mother cell. 5, 6, stages in the formatioQ of the antherozoid. Regaud's method. (After Emberger). Fig. 73 (right). — Behavior of the chondriome during the life cycle of a fern, I. leaf; starch-forming chloroplasts and chondriosomes. 2-3, formation of spores: decreasing activity of plastids. 4, spore mother cells; inactive plastids indistinguis
Archive image from page 119 of The cytoplasm of the plant. The cytoplasm of the plant cell cytoplasmofplant00guil Year: 1941 ? 3 ' - 4 Fig. 72 (left). — Chondriome of antherozoids of Adiantum capillus-Veneriii. 1, 2, antheridial initial. 3, 4, sperm mother cell. 5, 6, stages in the formatioQ of the antherozoid. Regaud's method. (After Emberger). Fig. 73 (right). — Behavior of the chondriome during the life cycle of a fern, I. leaf; starch-forming chloroplasts and chondriosomes. 2-3, formation of spores: decreasing activity of plastids. 4, spore mother cells; inactive plastids indistinguish- able from chondriosomes. 5, mature spore; plastids become active. 6, prothallus: starch-bearing chloroplasts. 7, 8, sexual cells; second cessation of activity of plastids. 9, egg; homogeneous chondriome. 10, developing embryo; certain chon- driosomes secrete starch. 11, 12, adult plant; 11, amyloplasts of the root. 12. chloroplasts of the leaves. (After Emberger). study of the hepatics claimed that this property is common to all plastids, even those lacking in chlorophyll, and considers it a means of distinguishing plastids from chondriosomes. But our later re- search, as well as that of Gautheret and of Mirimanoff, did not confirm this assertion and proved that plastids without chlorophyll do not reduce silver nitrate in living cells any more than do chon- driosomes. This property which chloroplasts have of reducing silver nitrate in living cells has nothing in common with the black coloration of the plastids and chondriosomes in cells treated by Alvarado's modification of Rio-Hortega's method, or with that sometimes taken on when they are impregnated with silver (Golgi method). It does, however, explain why Pensa found that only the chloroplasts were stained when he treated living tissue with Golgi's technique (silver impregnation).
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