This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1887 Excerpt: ...cylinder than is usual; nevertheless, these three linearly arranged Tracheids, along with those at /' constitute the monarch point, to which the remaining vessels of the bundle were added centripetally. In figs. 60 and 61 a further increase in the same direction is seen. There are about sixty-four vessels in fig. 60 ...
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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1887 Excerpt: ...cylinder than is usual; nevertheless, these three linearly arranged Tracheids, along with those at /' constitute the monarch point, to which the remaining vessels of the bundle were added centripetally. In figs. 60 and 61 a further increase in the same direction is seen. There are about sixty-four vessels in fig. 60 and seventy-five in fig. 61; the apparent adhesion of the left-hand side of the bundle to the bundle sheath in fig. 60 is merely accidental, not organic. The only material changes to be noted are that the section of the latter bundle has become increasingly wedge shaped, and the newer Tracheids, /," are more obviously arranged in radiating series than are the older ones, /," changes which are yet more conspicuous in fig. 60. It is important to note that every intermediate condition exists between the pyriform bundles of figs. 57 and 58 and the wedge-shaped bundles of figs. 60 and 61, since M. Renault has attempted to show that these extreme modifications of a graduated series represent important morphological and functional distinctions; a subject to be discussed immediately. Equally important is the fact that each bundle commences its growth from a single point, /', not at three points, as is affirmed by M. Renault; nor yet at two semi-contiguous points, which become one by coalescence, as M. van Tieghem believes to be the case with the representative bundles in the roots of living Lycopods.1 We now know that on its primary appearance in any young root, the vascular xylem almost invariably takes the shape of two or more groups of minute vessels, symmetrically arranged round the periphery of a central cylindrical strand of small meristematic cells. Sachs has designated this axial strand a procambium, Nageli a cambium strand, Russow a des...
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Add this copy of A Monograph on the Morphology and Histology of to cart. $54.95, good condition, Sold by Bonita rated 4.0 out of 5 stars, ships from Newport Coast, CA, UNITED STATES, published 2016 by Palala Press.