. Nature and development of plants. Botany. 2 THE LIVING SUBSTANCE OF PLANTS functions, they all possess cell walls which contain during the life of the cell a substance termed protoplasm. This substance resembles somewhat the white of an egg, being viscid and rather tenacious. The protoplasm is not of uniform consistency. The larger portion of it is finely granular and is called the cytoplasm while a denser rounded part is termed the nucleus. Other bodies, plastids, also denser than the cytoplasm are of common occur- rence. Such plastids as contain a green pigment, chlorophyll, are called chl
. Nature and development of plants. Botany. 2 THE LIVING SUBSTANCE OF PLANTS functions, they all possess cell walls which contain during the life of the cell a substance termed protoplasm. This substance resembles somewhat the white of an egg, being viscid and rather tenacious. The protoplasm is not of uniform consistency. The larger portion of it is finely granular and is called the cytoplasm while a denser rounded part is termed the nucleus. Other bodies, plastids, also denser than the cytoplasm are of common occur- rence. Such plastids as contain a green pigment, chlorophyll, are called chloroplastids or chloroplasts, and these produce the green. Fig. 2. Structure of the cell: A, cell ditch-moss, Philotria; n, nucleus i), vacuole, ch, chloroplast. B, cell of carrot; ch, yellowish chromoplasts, n, nucleus. C, reddish chromoplasts from rose hip. D, cells of Begonia; s, starch grains, c, crystals of lime. E, leucoplast, I, of potato forming a starch grain. color of the vegetation (Fig. 2, A). Still other plastids, the chromoplasts, contain red or yellow pigments that give the color to many fruits and flowers, as the tomato, rose-hip, squash, nas- turtium, etc. (Fig. 2, B, C). Colorless plastids, leucoplasts, often. 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 Curtis, Carlton Clarence, 1864-1945. New York, H. Holt
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