. A general system of botany, descriptive and analytical. In two parts. Part I. Outlines of organography, anatomy, and physiology. Part II. Descriptions and illustrations of the orders. By Emm. Le Maout [and] J. Decaisne. With 5500 figures by L. Steinheil and A. Riocreux. Translated from the original by Mrs. Hooker. The orders arranged after the method followed in the universities and schools of Great Britain, its colonies, America, and India; with additions, an appendix on the natural method, and a synopsis of the orders, by Hooker. Botany. 639. Arum. Seed out vertically (mag,). 641. Oat
. A general system of botany, descriptive and analytical. In two parts. Part I. Outlines of organography, anatomy, and physiology. Part II. Descriptions and illustrations of the orders. By Emm. Le Maout [and] J. Decaisne. With 5500 figures by L. Steinheil and A. Riocreux. Translated from the original by Mrs. Hooker. The orders arranged after the method followed in the universities and schools of Great Britain, its colonies, America, and India; with additions, an appendix on the natural method, and a synopsis of the orders, by Hooker. Botany. 639. Arum. Seed out vertically (mag,). 641. Oat. Isolated embryo seen on its outer face ( 643. Aconite. Seed cut Vei-tically (mag.). 640. Oat. Vertical section of fruit (mag.). 642. Oat. Germinating embryo. (mag.). an enlarged neck which narrows towards the base into an obtuse cone; the interior leaf (c) is the cotyledon, the others (g) form the plumule, the conical disk is the caulicle, terminated by the radicular end (e). If we extract the entire embryo (fig. 641), we perceive the cotyledon, which is large, and hollowed into a sort of spoon-shape, in the middle of which lies the plumule, forming a closed bag ; in the middle of this bag is a very small longitudinal slit, which enlarges later into a sheath, to open a passage for the contained leaves; below is the caulicle, bearing the cotyledon on its side, and the plumule in its axis; its free end is terminated by rounded protuberances, in which holes will form, whence radicular fibres will emerge at the period of germination, as from so many sheaths (fig. 642, Col.). Albumen.—Many seeds contain, besides the embryo, a disconnected accessory mass of parenchyma, named albumen {albumen, perisperTmim), the formation of which will be explained in the chapter on the Ovule. It is destined to nourish the embryo, and exists at an early period in all seeds; if only a portion of it is absorbed by the embryo, the rest hardens, up to the period of germination, and the embryo is
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Keywords: ., bookcentury1800, bookdecade1870, booksubjectbotany, bookyear1873
