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Author: Leland Ossian Howard
Publisher:
ISBN:
Category : Beneficial insects
Languages : en
Pages : 44
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Book Description
Author: Leland Ossian Howard
Publisher:
ISBN:
Category : Beneficial insects
Languages : en
Pages : 44
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Book Description
Author: Leland Ossian 1857 Howard
Publisher:
ISBN: 9781361972045
Category : History
Languages : en
Pages : 42
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Author: Leland Ossian Howard
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Author: Leland Ossian 1857- [From Old C Howard
Publisher: Palala Press
ISBN: 9781359502476
Category :
Languages : en
Pages :
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Book Description
This work has been selected by scholars as being culturally important, and is part of the knowledge base of civilization as we know it. This work was reproduced from the original artifact, and remains as true to the original work as possible. Therefore, you will see the original copyright references, library stamps (as most of these works have been housed in our most important libraries around the world), and other notations in the work. This work is in the public domain in the United States of America, and possibly other nations. Within the United States, you may freely copy and distribute this work, as no entity (individual or corporate) has a copyright on the body of the work. As a reproduction of a historical artifact, this work may contain missing or blurred pages, poor pictures, errant marks, etc. Scholars believe, and we concur, that this work is important enough to be preserved, reproduced, and made generally available to the public. We appreciate your support of the preservation process, and thank you for being an important part of keeping this knowledge alive and relevant.
Author: L. O. Howard
Publisher:
ISBN: 9781332123049
Category : Science
Languages : en
Pages : 42
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Book Description
Excerpt from The Economic Status of Insects: As a Class The popular conception of insects in general is undoubtedly that they are injurious. Many writers, it is true, have pointed out the benefits derived from insects, but we think of their damage to crops and of their annoyance to man and animals, and this aspect of the subject is at once apt to preponderate in our minds. It is more than 80 years since Kirby and Spence contrasted the injuries caused by insects with the benefits derived from them, and it has not been comprehensively done since. In the meantime, whole groups of important injuries have been developed and whole classes of beneficial work have been discovered. Moreover, the tendency of modern thought has not taken this direction. The biologic taxonomic and phylogenetic, and other aspects of large groups of forms of life have been considered to the exclusion of the economic aspect, and even where this side has attracted attention investigators have confined themselves to specific problems and have not generalized. It may be interesting, therefore, once more to contrast the injurious insects with the beneficial ones in an effort to gain a clearer idea of the status of the group in its relations with man. 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.
Author: Dennis S. Hill
Publisher: Springer Science & Business Media
ISBN: 9780412498008
Category : Technology & Engineering
Languages : en
Pages : 412
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Book Description
In the last few decades there has been an ever-increasing component in most BSc Zoology degree courses of cell biology, physiology and genetics, for spectacular developments have taken place in these fields. Some aspects of biotechnology are now also being included. In order to accommodate the new material, the old zoology courses were altered and the traditional two-year basis of systematics of the animal kingdom, comparative anatomy (and physiology) and evolution, was either severely trimmed or reduced and presented in an abridged form under another title. Soon after these course alterations came the swing to modular teaching in the form of a series of shorter, separate courses, some of which were optional. The entire BSc degree course took on a different appearance and several different basic themes became possible. One major result was that in the great majority of cases taxonomy and systematics were no longer taught and biology students graduated without this basic training. We field biologists did appreciate the rising interest in ecology and environ mental studies, but at the same time lamented the shortage of taxonomic skills, so that often field work was based on incorrect identifications. For years many of us with taxonomic inclinations have been bedevilled by the problem of teaching systematics to undergraduates. At a guess, maybe only 5% of students find systematics interesting. It is, however, the very basis of all studies in biology - the correct identification of the organism concerned and its relationships to others in the community.
Author: William Lochhead
Publisher: Philadelphia : P. Blakiston's Son
ISBN:
Category : Beneficial insects
Languages : en
Pages : 466
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Book Description
Author: William Lochhead
Publisher: Forgotten Books
ISBN: 9780266227977
Category : Science
Languages : en
Pages : 458
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Book Description
Excerpt from Class Book of Economic Entomology: With Special Reference to the Economic Insects of the Northern United States and Canada The author is indebted to many fellow-teachers and workers for valu able aid and suggestions in the preparation of this book. In most respects it is a compilation from recent text-books, bulletins, and arti cles. In a work of this kind errors are likely to appear in spite of every precaution, but considerable care has been taken to reduce them to a minimum. 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.
Author: William Lochhead
Publisher:
ISBN:
Category : Beneficial insects
Languages : en
Pages : 436
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Book Description
Author: Charles William Woodworth
Publisher:
ISBN:
Category : Insect pests
Languages : en
Pages : 862
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Book Description
