. The essentials of botany. Botany. 16 BOTANY. a, section with carmine the protoplasm in the starch-bearing cells may be made evident. (c) Study the starch of wheat, rice, Indian corn, oats, etc. (d) Mount carefully a few threads of Pond Scum (Spirogyra) which have been for some hours in the sunlight. Note the aggregations of minute starch-grains in the spiral chloroplasts (Fig. 11). Now add iodine and observe the color- ation of starch-grains. (e) Make thin sections of leaves which have been in the light for some hours, and observe minute starch-grains in the chlorophyll-bodies. Use iodine as
. The essentials of botany. Botany. 16 BOTANY. a, section with carmine the protoplasm in the starch-bearing cells may be made evident. (c) Study the starch of wheat, rice, Indian corn, oats, etc. (d) Mount carefully a few threads of Pond Scum (Spirogyra) which have been for some hours in the sunlight. Note the aggregations of minute starch-grains in the spiral chloroplasts (Fig. 11). Now add iodine and observe the color- ation of starch-grains. (e) Make thin sections of leaves which have been in the light for some hours, and observe minute starch-grains in the chlorophyll-bodies. Use iodine as above. (/) Make longitudinal sections of ripened apple-twigs and note the starch stored in certain cells of the pith for use when growth is resumed. 24. Aleurone.—In mature seeds there are commonly to be found small rounded granules of albumi- nous matter to which the name of Aleurone has been given (Fig. 9). It is, in part at least, the Ftq. 11.—Two plants of Pond protein matter of the older botan- Soum (Spirogyra), showing spi- ral chloroplasts, each with ag- jgts. It IS also identical with what gregations of starcn. At a and trch^f/eplrltSrftoTni^ l^^s been called the gluten of the ing. Magnified 500 times. ^^^^^^ ^j ^^^^^^^ ^^^^ ^^^^ ^^^_ 25. Aleurone is poorly understood, but it appears to be a dry resting state of protoplasm. Some, if not all, of it may become active again upon the access of water and the proper temperature. Possibly some of it serves as food for protoplasm in the germination of seeds. Practical Studies.—(a) Mount in alcohol or glycerine a thin slice of a ripe pea. Note the small granules (along with large starch-. 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 Bessey, Charles E. (Charles Edwin), 1845-1915. New York : Holt
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectbotany, bookyear1896
