The Anatomy, Physiology, Morphology, and Development of the Blow-Fly (Calliphora Erythrocephala), Vol. 2

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Excerpt from The Anatomy, Physiology, Morphology, and Development of the Blow-Fly (Calliphora Erythrocephala), Vol. 2: A Study in the Comparative Anatomy and Morphology of Insects, With Plates and Illustrations Executed Directly From the Drawings of the Author All perfect insects, if the doubtful case of some Collembola be excepted, breathe by means of a tracheal system, and respire air, which enters the tracheæ by external openings termed spiracles. In some aquatic larvæ, however, spiracles are absent, and the tracheal system is said to be closed, such larvæ usually possess tracheal gills. 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.