Contributions to Embryology Vol. 11
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Total Pages | : 170 |
Release | : 1920 |
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Total Pages | : 170 |
Release | : 1920 |
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Total Pages | : 0 |
Release | : 1920 |
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Author | : Carnegie Institution of Washington |
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Total Pages | : 220 |
Release | : 1917 |
Genre | : Birds |
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Total Pages | : 0 |
Release | : 1917 |
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Author | : Carnegie Institution Of Washington |
Publisher | : Forgotten Books |
Total Pages | : 134 |
Release | : 2018-01-17 |
Genre | : Science |
ISBN | : 9780483254398 |
Excerpt from Contributions to Embryology, Vol. 4: Nos. 10, 11, 12, 13 It is, however, not quite clear how the cavity traversed by scattered strands of mesoblast and lying between the yolk-sae and the chorion in the Peters ovum is to be interpreted. It may be sup posed to represent the extraembryonic coelom; but it may also be imagined that it has arisen from an extensive loosening up of the tissue, and not by a splitting of the mesoderm, and that the triangular space between the caudal extremity of the embryo, which is lined with flat cells having an epithelial arrangement, is the first primordium of the coelom. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.
Author | : Carnegie Institution Of Washington |
Publisher | : Forgotten Books |
Total Pages | : 216 |
Release | : 2017-10-26 |
Genre | : Science |
ISBN | : 9781527728660 |
Excerpt from Contributions to Embryology, Vol. 6: Nos. 15, 16, 17, 18, 19 Stockard has recently attempted to define more accurately the eye primordia in Amblystoma by operating upon the medullary plate. First of all, he found that pricking the medullary plate, as Lewis pricked the germ-shield in Fundulus, had no effect whatever upon the growth of the eyes. They invariably grew in a normal way. He then removed various parts of the medullary plate and found that the removal of a median strip about one-fourth to one-third the width of the medullary plate resulted in eyeless embryos The entire eye primordium apparently lies within this median strip. When a narrower strip was removed the embryos de veloped with one eye, with defective eyes, or with no eyes at all From these experiments he concludes that the primordia of Amblystoma arise in the antero median portion of the medullary plate, and not from two independent primordia, as is believed by Lewis. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.
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Total Pages | : 0 |
Release | : 1926 |
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Release | : 1915 |
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Total Pages | : 162 |
Release | : 1922 |
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Author | : Carnegie Institution Of Washington |
Publisher | : Forgotten Books |
Total Pages | : 500 |
Release | : 2019-02-12 |
Genre | : Science |
ISBN | : 9781397323316 |
Excerpt from Contributions to Embryology, 1916, Vol. 4: Nos. 10, 11, 12, 13 A condition similar to that found in the Peters specimen has been observed by Lewis in the Herzog specimen, which is of about the same stage of development. Lewis says (see; his paper, p. 300) that there are occasional clefts in the mesoderm of the chorion of the Herzog embryo, but that they are of doubtful significance. His reconstruction shows a strand of mesoderm, more pronounced than in the Peters ovum, extending from the yolk-sac to the chorion and circumscribing a space on the ventral side of the embryo. Eternod has written several papers in which he describes the formation of the exocoelom and the fate of the magma réticulé. He says that it first fills the entire space between the primordium of the embryo and the chorionic wall. Later, larger spaces appear within the substance of the magma, leaving denser strands of magma fibrils to support the embryo within the gradually expanding chorion. In general this coincides with the opinions just cited. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.