Publisher's Synopsis
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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