Recent Advances In Entomology With 84 Illustrations PDF Download

Excerpt from Recent Advances in Entomology IN preparing a second edition of this book two reasons have led to the decision to confine its scope within the original limits. Firstly, in any attempt to discuss recent advances in entomology, at all exhaustively, several volumes, each the size of the present one, would be needed. Even to include adequate extra chapters the size of the book would need to be increased a good deal beyond its prescribed limits. Secondly, those other aspects of entomology that commend themselves for inclusion are, to a large extent, provided for elsewhere. In this connection, insect physiology, insects and climate, general morphology, insects and plant viruses, for example, have already formed the subjects of recent books or monographs. The writers of these several books have discussed such subjects far more adequately than could be expressed within the limits of single chapters. Certain aspects of entomology, naturally, have required more revision than others. Under morphology, while current Views on Wing Venation have undergone but little change, Head Segmentation and the Genitalia have needed considerable revision. Also, recent studies of the musculature have led to revision of views respecting the homologies of certain of the appendages and their parts. As regards Metamorphosis, discoveries in regard to the presence of hormones are discussed. Palaeontology has developed so rapidly as to require very full revision of the original chapter: several new illustrations, taken from recent papers by Dr. F. M. Carpenter, have been included in this chapter with the author's permission. In dealing with the Sense Organs the subject of response to visual stimuli has been extended so as to include the results of a good deal of recent investigation. In this connection valuable help has been given by Dr. M. Hertz, which is here gratefully acknowledged. The subject of Stimulatory Organs has also been included. With regard to Biological Races. 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.