Description
Excerpt from The Wing Veins of Insects, Vol. 1
Additional evidence in favor of the theory of the indirect development of the wings may be had from a study of the structure of existing and fossil wings. ''the great difference that is evident between the structure of the wing membrane and that of''the body wall is nowhere bridged over by tran sitional conditions, even in degenerate and functionless wings. It is only in cases where the wing loses in a measure its flight function by taking upon itself other duties, as in the case of elytra, halters, etc., that the histological structure becomes approximately that of the body wall. The invariable association of strikingly distinct structural peculiarities with the function of flight and the absence of transitional conditions indicates that the primitive wing must have arisen from an organ distinct in function and structure from any of the types of functional wings known in living insects or preserved to us in the rocks. Some of the differentiations that characterize wings arose while the wing exercised this other function.
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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.
Additional evidence in favor of the theory of the indirect development of the wings may be had from a study of the structure of existing and fossil wings. ''the great difference that is evident between the structure of the wing membrane and that of''the body wall is nowhere bridged over by tran sitional conditions, even in degenerate and functionless wings. It is only in cases where the wing loses in a measure its flight function by taking upon itself other duties, as in the case of elytra, halters, etc., that the histological structure becomes approximately that of the body wall. The invariable association of strikingly distinct structural peculiarities with the function of flight and the absence of transitional conditions indicates that the primitive wing must have arisen from an organ distinct in function and structure from any of the types of functional wings known in living insects or preserved to us in the rocks. Some of the differentiations that characterize wings arose while the wing exercised this other function.
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.
Details
Publisher - Forgotten Books
Language - English
Hardback
Contributors
Author
C. W. Woodworth
Published Date -
ISBN - 9780656397129
Dimensions - 22.9 x 15.2 x 2.7 cm
Page Count - 506
Paperback
Contributors
Author
C. W. Woodworth
Published Date -
ISBN - 9781332208319
Dimensions - 22.9 x 15.2 x 2.7 cm
Page Count - 508
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