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Excerpt from Color Changes of Animals in Relation to Nervous Activity
The present volume is a somewhat extended form of the Joseph Leidy Memorial Lecture in Science delivered at the University of Pennsylvania March 3, 1936. In ad dition to the historical summaries it con31sts in large part of the recent studies by my students and myself on the means of activating color-cells in the higher ani mals and on the significance of these processes for the workings of the nervous system. It is believed that the idea of the neurohumors, set forth in numerous earlier publications and rather fully elucidated in this volume, has a measure of truth in it for general nervous func tions, and it is one of the objects of this essay to point out some of the reasons for accepting this idea and for testing its further applications. The whole proposal 1s quite obviously in a formative stage and, as every inves tigator knows, its outcome must await further study.
The invitation to deliver the Leidy lecture came to me from a committee consisting of Dr. Josiah H. Penni man, Provost of the University of Pennsylvania, Dr. Eliot Clark, Dr. Milton Greenman, and Dr. C. E. Mcclung. To these gentlemen I wish to express my keen appreciation of the honor of this invitation and the great pleasure I take in accepting it. A certain personal gratification that I feel in this acceptance I have at tempted to indicate in the Foreword.
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Paperback. Zustand: New. Print on Demand. This book explores the fascinating world of animal color changes, focusing on the physiological mechanisms underlying these dynamic transformations. The author delves into the historical understanding of color changes, highlighting early observations and theories. The book examines two distinct types of color control in animals: nervous and hormonal. In the nervous system, the author explores the role of specific nerve fibers that induce pigment dispersion or concentration in chromatophores, the cells responsible for color changes. The hormonal control system, discussed in depth, reveals the influence of neurohumors, chemical messengers produced by the pituitary gland, on chromatophores. The author presents a novel view of chromatophoral nerves, challenging the traditional notion of nerve paralysis after cutting. Through innovative experiments, it is shown that severed nerves remain active, inducing prolonged pigment dispersion in melanophores, the dark pigment cells. The book concludes by emphasizing the significance of these findings for understanding the workings of the nervous system and the broader field of neurobiology. By unraveling the complex interplay between nerves and hormones in animal color changes, the author provides valuable insights into the mechanisms that govern these remarkable adaptations. This book is a reproduction of an important historical work, digitally reconstructed using state-of-the-art technology to preserve the original format. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in the book. print-on-demand item. Bestandsnummer des Verkäufers 9781334412967_0
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