Introduction to structural and systematic botany, and vegetable physiology, : being a 5th and revedof the Botanical text-book, illustrated with over thirteen hundred woodcuts . FIG. 118. Embryo of a Pea. 119. The same in germination. FIG. 120. An acorn, divided lengthwise, showing a section of the very thick and fleshycotyledons and the very small radicle. 121. Germination of the acorn. PLANTS FROM THE SEED. 77 the surrounding albumen, which in germination is gradually lique-fied, its starch or amyloid being transformed into dextrine andsugar (80, 82, 83). Thus nourished, the radicle rapidly l
Introduction to structural and systematic botany, and vegetable physiology, : being a 5th and revedof the Botanical text-book, illustrated with over thirteen hundred woodcuts . FIG. 118. Embryo of a Pea. 119. The same in germination. FIG. 120. An acorn, divided lengthwise, showing a section of the very thick and fleshycotyledons and the very small radicle. 121. Germination of the acorn. PLANTS FROM THE SEED. 77 the surrounding albumen, which in germination is gradually lique-fied, its starch or amyloid being transformed into dextrine andsugar (80, 82, 83). Thus nourished, the radicle rapidly lengthensinto a stem, and develops a root from its 122 123 lower extremity, connecting it with the. soil; and when the enlarging cotyledons extricate themselves froni the decayingseed-coats and expand inthe light as the first pairof leaves, the plantlet isalready established as acomplete miniature vege-table, able to nourish it-self, and make sufficientprovision for its own con-tinued growth. m 125 126. The embryo in seeds provided with albumenis sometimes very small, as in Fig. 131, or evenmuch more minute, and with its parts so rudimentarythat they are hardly or not at all discernible previousto their gradual development in germination. Butsometimes it is pretty large, and with* all its parts129 obvious in the seed; as in the Morning-Glory and in Indian Corn (Fig. 122). The latter has a highly organized FIG. 122. Seed and embryo of the common Morning-Glory, cut across ; the latter seenedgewise. 123. Embryo of the same, detached and straightened, seen flatwise. 124. Germi-nating Morning-Glory. 125. The same further advanced ; its two thin seed-leaves expanded. FIG. 126. A grain of
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Keywords: ., bookauthorgra, bookcentury1800, bookdecade1860, booksubjectbotany
