. Elements of botany. Plants. Fig. 11.—Section through Exterior Part of a Grain of Wheat. c, cuticle or outer layer of bran ; ep, epidermis ; m, layer beneath epidermis ; qu, sch, layers of hull next to true seed-coats ; br, n, seed-coats ; Kl, layer containing grains of proteid material; st, cells of the albumen, filled with starch. 32. Absorption of Starch from the Cotyledons.—Examine with the microscope, using a medium power, soaked beans and the cotyledons from seedlings that have been growing for three or four weeks. Stain the sec- tions with iodine solution, and notice how completely the
. Elements of botany. Plants. Fig. 11.—Section through Exterior Part of a Grain of Wheat. c, cuticle or outer layer of bran ; ep, epidermis ; m, layer beneath epidermis ; qu, sch, layers of hull next to true seed-coats ; br, n, seed-coats ; Kl, layer containing grains of proteid material; st, cells of the albumen, filled with starch. 32. Absorption of Starch from the Cotyledons.—Examine with the microscope, using a medium power, soaked beans and the cotyledons from seedlings that have been growing for three or four weeks. Stain the sec- tions with iodine solution, and notice how completely the clusters of starch- grains that filled most of the cells of the unsprouted cotyledons have disappeared from the shriveled cotyledons of the seedlings. A few grains may be left. Fig. 12.—Corroded starch-Grains but they have lost their sharpness of from the Endosperm of the Kernel ,,. J . , 1 X T of Sprouted Indian Corn. The outlme, and resemble somewhat the ,^^^„j,^„ ^^^^ ^^^^.^^ .^^^^^^ ^^^ "corroded" starch - grains of Indian The mi<ldle starch-grain of the corn shown in Fig. 12. lower row is uncorroded. 1 The teacher will do well to sketch with the camera lucida a few divisions of the stage-micrometer and some cells of the seed, with contained starch-grains, on a piece of cardboard that may be passed round the class to give a precise idea of the actual and the apparent size of the objects 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 Bergen, Joseph Y. (Joseph Young), 1851-1917; Bergen, Joseph Y. (Joseph Young), 1851-1917. Bergen's Botany: key and flora, Pacific coast ed. Boston : Ginn
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectplants, bookyear1896
