. Plant life, considered with special references to form and function. Plant physiology. - A-. Fic Fig. Fig. 6.—P.^rt of the cell-contents of an inner cell of white potato. 2, nucleus; j, starch-grains, each ha\-ing been formed by a leucoplast, /, which is still attached to one side of the grain; k, crystalloid. Magnified abont 1000 diam.—After Zimmer- niann. Fig. 7.—Leucoplasts in place in a young cell of a leaf of vanilla, /, leucoplasts; 2, nucleus; e. an oil-former or elaioplast. The unshaded spaces surrounded by proto- plasm are vacuoles. Magnified about 1000 diam.—After Wakker. of need,
. Plant life, considered with special references to form and function. Plant physiology. - A-. Fic Fig. Fig. 6.—P.^rt of the cell-contents of an inner cell of white potato. 2, nucleus; j, starch-grains, each ha\-ing been formed by a leucoplast, /, which is still attached to one side of the grain; k, crystalloid. Magnified abont 1000 diam.—After Zimmer- niann. Fig. 7.—Leucoplasts in place in a young cell of a leaf of vanilla, /, leucoplasts; 2, nucleus; e. an oil-former or elaioplast. The unshaded spaces surrounded by proto- plasm are vacuoles. Magnified about 1000 diam.—After Wakker. of need, in young cells, may e\en be converted into chloro- plasts. In other cells, particularly in highly colored parts, the plastids may become of most diverse form and size, and colored red or yellow, whence they are called chromoplasis or color-bodies (figs. S, 9). 9. Wall.—The cell-wall is formed by the protoplasm. In green plants when first formed it consists chiefly of cell- ulose, with which, as it grows older, various other substances may be Some of these, such as pectin, are present even in the young wall, and may increase with age; others. 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 Barnes, Charles Reid, 1858-1910. New York, H. Holt & company
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