. 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. ELEMENTARY OEGANS. 119 are thus distinguislied.
. 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. ELEMENTARY OEGANS. 119 are thus distinguislied. from proper vessels by tlieir transparent walls and by branching. TTnion of the Elementary Organs.—Botanists are divided in opinion as to the forces which cause the walls of the elementary organs to cohere; some think that the walls of the cells are originally semi-fluid, and hence become agglutinated, and remain so even after the plant has ceased to live; others consider that an inter- cellular secretion cements the adjacent cell-walls. A third opinion is that vegetable tissue originates as a homogeneous plasma, which gradually thickens, and ends by forming vacuoles, which afterwards become the cavities of the cells; a common septum therefore separates the neighbouring cells; but soon each cell becomes individualized, the septum doubles more or less completely, and the cohesion between the cells is due to an interposed cellular tissue. This theory differs from the second, inasmuch that in the latter the cells are cemented by a subsequently secreted matter, while in the former the cells are united by an unorganized tissue, developed cotemporaneously with themselves; this unorganized tissue then itself becomes cellular, and finally separates the previously individualized cells which' it originally united. Communication is established between elementary organs in various ways; it has been stated that it takes place by means of the destruction of the contiguous surfaces of cell
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Keywords: ., bookcentury1800, bookdecade1870, booksubjectbotany, bookyear1873
