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Author: Ross G. Harrison Publisher: Forgotten Books ISBN: 9780267977109 Category : Science Languages : en Pages : 522
Book Description
Excerpt from The Journal of Experimental Zoology, 1921, Vol. 33 The following-experiments were carried out at the University of Chicago during the years 1917 to 1919. I am deeply indebted to Professor Lillie for his invaluable suggestions and criticisms during the course of the work and for his generosity in Supplying me with numerous materials used in the experiments. I also wish to express my thanks to Dr. L. H. Hyman for revising the manuscript. 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: Ross G. Harrison Publisher: Forgotten Books ISBN: 9780267977109 Category : Science Languages : en Pages : 522
Book Description
Excerpt from The Journal of Experimental Zoology, 1921, Vol. 33 The following-experiments were carried out at the University of Chicago during the years 1917 to 1919. I am deeply indebted to Professor Lillie for his invaluable suggestions and criticisms during the course of the work and for his generosity in Supplying me with numerous materials used in the experiments. I also wish to express my thanks to Dr. L. H. Hyman for revising the manuscript. 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: Ross G. Harrison Publisher: Forgotten Books ISBN: 9781330383469 Category : Science Languages : en Pages : 522
Book Description
Excerpt from The Journal of Experimental Zoology, 1921, Vol. 33 The study of the free-martin by F. R. Lilhe ('17 b) has thrown new light on the field of the biology of sex, demonstrating that sexual differentiation is controllable, at least to some extent, by a certain physiological factor. Lillie discovered that in the free-martin, the female of two-sexed twins in cattle, the sex-glands and sex-ducts are modified from the normal female condition to a sterile masculinized state; that in cattle twins an anastomosis of the umbilical blood-vessels exists between the two embryos, and that this anastomosis is responsible for the alteration of the female twin, the sex-hormones from the male twin being thus enabled to gain access to the female twin through the blood current and to produce a profound modification of her reproductive system. A histological study of the same material by Chapin ('17)supported Lillie's conclusion that the free-martin is a modified female. As Lillie suggested ('17 a), "the possibility exists, however, that definitely planned experiments may enable us to regulate time and dosage of hormones better than is done in this experiment of nature; the results of such experiments cannot of course be foreseen... Such experiments will be necessary for the full solution of the stated problem." I therefore, at Professor Lillie's suggestion, undertook to perform such a series of experiments for the purpose of determining whether or not sexual differentiation is experimentally controllable through the secretion of the sex-glands. Gonads were grafted on the membranes of developing chick embryos in relatively young stages; such embryos were then allowed to develop further, and in cases where the grafts grew, the urinogenital systems of the embryos were studied to determine what effects had been produced by the presence of the gonad grafts. The results of these experiments are presented in the present paper and others to appear subsequently. It has already been abundantly proved through numerous studies on birds and mammals that the sex-glands do produce a secretion or secretions which play an important role in the production and maintenance of secondary sexual characters. 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: Ross Granville Harrison Publisher: Forgotten Books ISBN: 9780484374118 Category : Science Languages : en Pages : 530
Book Description
Excerpt from The Journal of Experimental Zoology, Vol. 32: January-April, 1921 Rule 2. An inverted bud (dorsoventral) gives rise to a limb of reversed asymmetry, whether implanted on the same or on the opposite side of the body. 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: Ross G. Harrison Publisher: Forgotten Books ISBN: 9780267973750 Category : Science Languages : en Pages : 508
Book Description
Excerpt from The Journal of Experimental Zoology, 1919, Vol. 28 Fig 1 The nitrogen cycle (from Bayliss). The accessory lines and circles in are my additions based on evidence in this paper. 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: Ross Granville Harrison Publisher: Forgotten Books ISBN: 9781391597775 Category : Science Languages : en Pages : 596
Book Description
Excerpt from The Journal of Experimental Zoology, 1916, Vol. 21 The previous studies on the influence Of the nervous system upon regeneration have given very divergent results which can hardly be reconciled even when the fact that widely separated groups Of animals were used as the material for experimentation is taken into consideration. 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: Ross G. Harrison Publisher: Forgotten Books ISBN: 9780484572279 Category : Science Languages : en Pages : 524
Book Description
Excerpt from The Journal of Experimental Zoology, Vol. 34: August-November, 1921 The concordance of results obtained by these various methods indicates clearly enough the existence of a definite gradation along the axes of organisms. The nature of this gradation is naturally open to discussion. Our explanation that the grada tion is primarily quantitative involving differences in the rate of fundamental metabolic reactions and in conditions associated with these is the only one that fits all of the facts at present known to us. 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: William Keith Brooks Publisher: Forgotten Books ISBN: 9780267975358 Category : Science Languages : en Pages : 622
Book Description
Excerpt from Journal of Experimental Zoology, 1928, Vol. 15 Francis B. Sumner. The effects of atmospheric temperature upon the body temperature of mice. Three figures. 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: William Keith Brooks Publisher: Palala Press ISBN: 9781343308268 Category : Languages : en Pages : 526
Book Description
This work has been selected by scholars as being culturally important, and is part of the knowledge base of civilization as we know it. This work was reproduced from the original artifact, and remains as true to the original work as possible. Therefore, you will see the original copyright references, library stamps (as most of these works have been housed in our most important libraries around the world), and other notations in the work.This work is in the public domain in the United States of America, and possibly other nations. Within the United States, you may freely copy and distribute this work, as no entity (individual or corporate) has a copyright on the body of the work.As a reproduction of a historical artifact, this work may contain missing or blurred pages, poor pictures, errant marks, etc. Scholars believe, and we concur, that this work is important enough to be preserved, reproduced, and made generally available to the public. We appreciate your support of the preservation process, and thank you for being an important part of keeping this knowledge alive and relevant.
Author: Ross G. Harrison Publisher: Forgotten Books ISBN: 9780483090088 Category : Science Languages : en Pages : 610
Book Description
Excerpt from The Journal of Experimental Zoology, 1936, Vol. 20 In a recent paper1 I reported an attempt to obtain a modified clone of Hydra Viridis by the continued selection of variates dif fering in the number of tentacles. In that experiment a clone was bred from a single wild polyp and two groups of its descend ants, each composed of 25 lines, were selected for variations in tentacle number in opposite directions from the mean of the clone. Selection was continued for several generations, then the number of tentacles of all buds produced by the last selected gen eration of the 50 lines was recorded and the averages of the two groups were compared. A slight difference, in the direction of selection, was found in the averages of the earlier buds of the two groups but this difference did not persist in the buds pro duced later by the same parents; regression was complete in a single generation. 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: Ross G. Harrison
Author: Ross G. Harrison
Author: Ross G. Harrison
Author: Ross Granville Harrison
Author: Ross G. Harrison
Author: Ross Granville Harrison
Author: Ross G. Harrison
Author: William Keith Brooks
Author: William Keith Brooks
Author: William E. Castle
Author: Ross G. Harrison