. How crops grow. A treatise on the chemical composition, structure, and life of the plant, for all students of agriculture ... Agricultural chemistry; Growth (Plants). 304 HOW CROPS GEOW. buckwheat, flax, and tobacco, contain an endosperm. The seeds of nearly all other exogenous agricultural plants are destitute of au endosperm, and, exclusive of the coats, consist-entirely of embryo. Such are the seeds of the Le- guminosse, viz., the bean, pea, and clover; of the Cracif- erae, viz., turnip, radish, and cabbage; of ordinary fruits, the apple, pear, cherry, plum, and peach; of the gourd family
. How crops grow. A treatise on the chemical composition, structure, and life of the plant, for all students of agriculture ... Agricultural chemistry; Growth (Plants). 304 HOW CROPS GEOW. buckwheat, flax, and tobacco, contain an endosperm. The seeds of nearly all other exogenous agricultural plants are destitute of au endosperm, and, exclusive of the coats, consist-entirely of embryo. Such are the seeds of the Le- guminosse, viz., the bean, pea, and clover; of the Cracif- erae, viz., turnip, radish, and cabbage; of ordinary fruits, the apple, pear, cherry, plum, and peach; of the gourd family, viz., the pumpkin, melon and cucumber; and finally of many hard-wooded trees, viz., the oak, maple, elm, birch, and beech. We may best observe the structure of the two-cotyle- doned embryo in the garden or kidney-bean. After a bean has been soaked in warm water for several hours, the coats may be easily removed, and the two fleshy cotyledons, c, c, in fig. 64, are found divided from each other save at the point where the radicle, «, is seen projecting like a blunt spur. On carefuUy breaking away one of the cotyledons, we get a side view of the radicle, a, and plumule,6, the foi-mer of which was partially and the latter entirely imbedded between the cotyledons. The plumule plainly Fig. 64. exhibits two delicate leaves, on which the unaided eye may note the veins. These leaves are folded together along their mid-ribs, and may be opened and spread out with help of a needle. When the kidney-bean {Phaseolus) germinates, the cot- yledons are carried up into the air, where they become green and constitute the first pair of leaves of the new plant. The second pair are the tiny leaves of the plumule just described, between which is the bud, whence all the subsequent aerial organs develope in succession. In the horse-bean, {Faba), as in the pea, the cotyledons never assume the office of leaves, but remain in the soil and gradually yield a large share of their contents to the Digitized
Size: 1748px × 1430px
Photo credit: © Central Historic Books / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1860, booksubjectagricul, bookyear1868
