. Botany for secondary schools; a guide to the knowledge of the vegetation of the neighborhood. Plants. GERMINATION IN PARTICULAR SEEDS 175. 317. Sprout- ing Indian corn. Hi- lum at h; micropyle at d. 318. Kernel of Indian corn. Caulicle at 6; cotyledon a ; plumule P- its central part "comes up" first, (a, Fig. 312.) Presently it draws the cotyledons out of the seed-coats, and then it straightens and the cotyledons expand. These coty- fflT/j ledons, or "halves of the bean," persist for some Br! time. (6, Fig. 312.) They often become green and probably perform some function
. Botany for secondary schools; a guide to the knowledge of the vegetation of the neighborhood. Plants. GERMINATION IN PARTICULAR SEEDS 175. 317. Sprout- ing Indian corn. Hi- lum at h; micropyle at d. 318. Kernel of Indian corn. Caulicle at 6; cotyledon a ; plumule P- its central part "comes up" first, (a, Fig. 312.) Presently it draws the cotyledons out of the seed-coats, and then it straightens and the cotyledons expand. These coty- fflT/j ledons, or "halves of the bean," persist for some Br! time. (6, Fig. 312.) They often become green and probably perform some function of foliage. Because of its large size, Lima bean shows all these parts well. 342. Germination of Castor Bean. —In the castor bean the hilum and micropyle are at the smaller end. (Fig. 313.) The bean "comes up" with a loop, which indicates that the hypocotyl greatly elongates. On exam- ining a germinating seed, however, it will be found that the cotyledons are contained inside fleshy body or sac. (a, Fig. 314.) This sac is the endosperm. To its inner sur- face the thin, veiny cotyledons are very closely appressed, absorbing its substance. (Fig. 315.) The cotyledons increase in size as they reach the air (Fig. 316), and become functional leaves. J 343. Germination of Indian Corn.—Soak kernels of I corn. Note that the micropyle and hilum are at the (I ~ smaller end. (Fig. 317.) Make a longi- A [ tudinal section through the narrow ^^^Jp^^:^ diameter; Fig. 318 shows it, The Pi l^ptf?w single cotyledon is at a, the caulicle at b, the plumule at p. The cotyledon remains in the seed. The food is stored both in the cotyledon and as endosperm, chiefly the latter. The emerging shoo,t is the plumule, with a sheathing. 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 Bailey, L. H. (Liberty Hyde), 1858-1954.
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectplants, bookyear1913
