On The Variation Of Species - With Especial Reference To The Insecta - Followed By An Inquiry Into The Nature Of Genera - Tapa blanda

Vernon Wollaston, Thomas

9781408636961: On The Variation Of Species - With Especial Reference To The Insecta - Followed By An Inquiry Into The Nature Of Genera

Tapa blanda

ISBN 10: 1408636964 ISBN 13: 9781408636961

Editorial: Read Books, 2008

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PREFACE . To make a dry subject entertaining, is impossible but to render it, at any rate, readable, has been my endeavour in the following pages. How far I have succeeded in the experiment, it is not for me to decide. It having been suggested, by several of my friends, that it might be desirable to bring together into a small compass some of the evidence on Insect variation with reference to external disturbing causes which my researches in the Madeira Islands have supplied me with, I have been encouraged to do so and I have added numerous conclusions from other data also, which have from time to time fallen in my way,-so as to confer on the volume a more practical interest, for the general naturalist. One of my main objects, however, has been to call attention to the fact, that the Annulosa have not been hitherto sufficiently considered, in the great questions arising out of the distribution of animals and plants hoping that, by so doing, some few of our British entomologists, who have not looked into this branch of their science, may be induced to enlist themselves in the cause of Insect geography. If such a result be brought about or if I be fortunate enough to open for discussion any of the topics which have been touched upon, and so lead to a more perfect solution of the problems which I have attempted to explain, I shall consider myself more than repaid. 10 Hereford Street, Park Lane, London, May loth, 1856. CONTENTS. CHAPTER I. Introductory Remarks.. . . . . . . . . . . . Page 1 CH, QPTER 11. Fact of Variation . 7 As a matter of experience .8 As probable from analogy . 10 CHAPTER 111. Causes of Variation . . . . . . . . . . . 1 9 Q 1. Climatal causes generally whether dependent upon latitude or upon altitude .................. 23 Q 2. Temporary heat or cold, of an unusual degree ... 42 Q 3. Nature of the country, and of the soil ...... ...... 46 Q 4. Isolation and exposure to a stormy atmosphere . 70 CHAPTER IV. Organs and Characters of Variation . . 95 CHAPTER V. Geological Reflections . . . . . . .. . .. 1 1 1 CHAPTER VI. The Generic Theory.. . 1 5 7 CHAPTER VII. Conclusion . . . , 1 8 1 CORRIGENDUM...

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