. 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. 126 686. Cork Oak. Horizontal slice s
. 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. 126 686. Cork Oak. Horizontal slice showing the developmenfc of two woody bundles in a four-year-old branch (mag.). divide the new bundle into two or three parts (fig. 686). These cellular rays (2, 3, 4), which are termed secondary medullary rays, to distinguish them from the primary (1), which start from the pith (m), are thus doubled in each annual ring, and, like the large rays between the fibro-vascular vessels, form a sort of vertical septa or radiating walls, com- posed of elongated and super- imposed cells; whence the name of muriform tissue for the me- dullary rays. Hence, in its totality the stem presents two very distinct systems, the woody {wood), and the cortical (bark). 1. The woody system is formed of the central pith and zones of fibro-vascular bundles, sepa- rated by medullary rays. The innermost of these is the medullary EiiSophoia. sheath, formed of trachess and fibres analogous to the liber, and ^™'"='^*'"«- outwardly composed of woody fibres and rayed, annular, and dotted vessels. The other zones are similarly organized, except that they never possess trachese. 2. The bark system is formed of the epidermis, the cork, the endophleum, and the bast fibres {liber), external to and amongst which the latieiferous vessels ramif^^ With age the cells of the pith lose colour, dry, separate, and finally die; the woody fibres thicken, and usually darken; of these the heart- wood {duramen) diff
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Keywords: ., bookcentury1800, bookdecade1870, booksubjectbotany, bookyear1873
