. Principles of plant culture : an elementary treatise designed as a text-book for beginners in agriculture and horticulture. Horticulture; Botany. 40 Principles of Plant Culture. 58. Chlorophyll (chlo'-ro-phyll). Soon after the plant- let emerges from the seed-case, a green color appears in the parts most exposed to light. This green color is due to the formation within the cells of a substance known as chloro- phyll,— the green coloring matter of plants. Chlorophyll forms only in the light, and when a plant containing green leaves is kept for a time in the dark, as when celery is banked up w
. Principles of plant culture : an elementary treatise designed as a text-book for beginners in agriculture and horticulture. Horticulture; Botany. 40 Principles of Plant Culture. 58. Chlorophyll (chlo'-ro-phyll). Soon after the plant- let emerges from the seed-case, a green color appears in the parts most exposed to light. This green color is due to the formation within the cells of a substance known as chloro- phyll,— the green coloring matter of plants. Chlorophyll forms only in the light, and when a plant containing green leaves is kept for a time in the dark, as when celery is banked up with earth, the chlorophyll disappears, and the green parts become white. The chlorophyll saturates defi- nite particles of the protoplasm, called chloroph3'll bodies, and since the cell-walls and protoplasm are transparent, in the younger cells, the chlorophyll bodies give the parts contain- ._p\. Fig. 13. Showing cross section through leaf of Fagus sylvatica. Ch, chloro- phyll bodies; Ep, epidermis of upper surface of leaf; Ep", epidermis of lower sur- face; K, cells coDtaiaiDg crystals; PI, palisade layer; F, vascular bundle; St, stoma; /, spaces between the cells, (intercellular spaces). Highly magnified. {After Strasburger). ing them a green color. Fig. 13 shows the distribution of the chlorophyll bodies in the cells of a portion of the leaf of the beech. They appear as minute globules, which in this case, are mostly located near the cell-walls. It will be seen that they are most numerous near the upper surface of the leaf,— the part most exposed to the sun's 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 Goff, E. S. (Emmett Stull), 1852-1902. Madison, Wis. : E. S. Goff
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