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Text-Book of the Embryology of Invertebrates, Vol. 4 (Classic Reprint) - Tapa blanda

Korschelt, E.

 
9781332070671: Text-Book of the Embryology of Invertebrates, Vol. 4 (Classic Reprint)

Sinopsis

Excerpt from Text-Book of the Embryology of Invertebrates, Vol. 4

The Tunicates, more than any other group, seem of recent years to have occupied the attention of embryologists, and the. Large amount 'of work which has been done on this group, especially in France, with regard to both the sexual and the asexual methods of reproduction, will be gathered from the additional literature appended to Chapter xxxv., only a small proportion of which could be referred to in the footnotes.

In the Mollusca also a great deal of work has been done, especially in connection with cell-lineage, and the formation of the mesoderm and of the larval kidney, in spite of which the last two points still remain obscure. Since I am more familiar with the Mollusca than with any other group of Invertebrata, I have revised the chapters dealing with this phylum some what more thoroughly than the rest of the volume; I have appended numerous notes, inserted some fresh paragraphs, and made certain alterations in the text which appeared justified. By' recent investigations.

I must again express regret that so long a time has inter vened between the publication of the German edition of this. Work and the appearance of the last volume of the English translation. Volumes ii., iii. And iv. Came into the hands of the translator only in 1897, and the task of bringing them out being necessarily somewhat lengthy, it has been impossible sooner to Offer the completed work to the English-speaking student, to whom it should be of great service.

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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Reseña del editor

Excerpt from Text-Book of the Embryology of Invertebrates, Vol. 4

The Tunicates, more than any other group, seem of recent years to have occupied the attention of embryologists, and the. Large amount 'of work which has been done on this group, especially in France, with regard to both the sexual and the asexual methods of reproduction, will be gathered from the additional literature appended to Chapter xxxv., only a small proportion of which could be referred to in the footnotes.

In the Mollusca also a great deal of work has been done, especially in connection with cell-lineage, and the formation of the mesoderm and of the larval kidney, in spite of which the last two points still remain obscure. Since I am more familiar with the Mollusca than with any other group of Invertebrata, I have revised the chapters dealing with this phylum some what more thoroughly than the rest of the volume; I have appended numerous notes, inserted some fresh paragraphs, and made certain alterations in the text which appeared justified. By' recent investigations.

I must again express regret that so long a time has inter vened between the publication of the German edition of this. Work and the appearance of the last volume of the English translation. Volumes ii., iii. And iv. Came into the hands of the translator only in 1897, and the task of bringing them out being necessarily somewhat lengthy, it has been impossible sooner to Offer the completed work to the English-speaking student, to whom it should be of great service.

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.

Reseña del editor

Excerpt from Text-Book of the Embryology of Invertebrates, Vol. 4

The present volume constitutes the final instalment of the translation of the Lehrhiich der verrleichenden Entwicklungsgeschichte der wirbellosen Thier, and contains the Mollusca, the Tunicata and the Cephalochorda.

The immense strides which have been made during the last eight years in the study of invertebrate embryology have necessarily rendered much of this work out of date, and in no part Ls this more apparent than in the chapter on the Tunicata, and especially in the sections dealing with Salpa. Up to the time of the appearance of this work in 1893, our knowledge of the embryology of this genus was mainly based upon the results of Salensky's investigations. His conclusions were so startling that our authors expressed considerable doubt concerning their accuracy, but, owing to the absence of any other observations, were obliged to incorporate them in this work. Since that time, the important investigations made by Brooks, Heider and Korotnetf have appeared, and these necessitate an entire revision of the section dealing with the embryology of Salpa, I, however, did not feel that it lay within my province to rewrite this section, so I have contented myself with appending numerous footnotes pointing out wherein the recent investigators differ in their observations and conclusions from those cited in these pages. It is, however, impossible to do full justice to this subject by means of footnotes, and the student who desires to study the subject thoroughly is referred to the original monographs.

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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