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Insects and Diseases
A Popular Account of the Way in Which Insects may Spread
or Cause some of our Common Diseases
Insects and Diseases
A Popular Account of the Way in Which Insects may Spread
or Cause some of our Common Diseases
Insects and Diseases
A Popular Account of the Way in Which Insects may Spread
or Cause some of our Common Diseases
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Insects and Diseases A Popular Account of the Way in Which Insects may Spread or Cause some of our Common Diseases

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Insects and Diseases
A Popular Account of the Way in Which Insects may Spread
or Cause some of our Common Diseases

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    Insects and Diseases A Popular Account of the Way in Which Insects may Spread or Cause some of our Common Diseases - Rennie Wilbur Doane

    The Project Gutenberg EBook of Insects and Diseases, by Rennie W. Doane

    This eBook is for the use of anyone anywhere at no cost and with

    almost no restrictions whatsoever. You may copy it, give it away or

    re-use it under the terms of the Project Gutenberg License included

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    Title: Insects and Diseases

    A Popular Account of the Way in Which Insects may Spread

    or Cause some of our Common Diseases

    Author: Rennie W. Doane

    Release Date: February 24, 2009 [EBook #28177]

    Last updated: March 2, 2009

    Language: English

    *** START OF THIS PROJECT GUTENBERG EBOOK INSECTS AND DISEASES ***

    Produced by Chris Curnow, Lindy Walsh, Greg Bergquist and

    the Online Distributed Proofreading Team at

    http://www.pgdp.net

    Transcriber’s Note

    The punctuation and spelling from the original text have been faithfully preserved. Only obvious typographical errors have been corrected.


    An artificial lake, nearly dry and partly filled with rubbish, has become a breeding-ground for dangerous mosquitoes.


    American Nature Series

    Group IV. Working with Nature


    INSECTS AND DISEASE

    A POPULAR ACCOUNT OF THE WAY IN WHICH

    INSECTS MAY SPREAD OR CAUSE SOME

    OF OUR COMMON DISEASES

    WITH MANY ORIGINAL ILLUSTRATIONS FROM

    PHOTOGRAPHS

    BY

    RENNIE W. DOANE, A.B.

    Assistant Professor of Entomology

    Leland Stanford Junior University

    LONDON

    CONSTABLE & COMPANY LIMITED

    1910


    Copyright, 1910,

    BY

    HENRY HOLT AND COMPANY


    Published August, 1910

    THE QUINN & BODEN CO. PRESS

    RAHWAY, N.J.


    PREFACE

    The subject of preventive medicine is one that is attracting world-wide attention to-day. We can hardly pick up a newspaper or magazine without seeing the subject discussed in some of its phases, and during the last few years several books have appeared devoted wholly or in part to the ways of preventing rather than curing many of our ills.

    Looking over the titles of these articles and books the reader will at once be impressed with the importance that is being given to the subject of the relation of insects to some of our common diseases. As many of these maladies are caused by minute parasites or microbes the zoölogists, biologists and physicians are studying with untiring zeal to learn what they can in regard to the development and habits of these organisms, and the entomologists are doing their part by studying in minute detail the structure and life-history of the insects that are concerned. Thus many important facts are being learned, many important observations made. The results of the best of these investigations are always published in technical magazines or papers that are usually accessible only to the specialist.

    This little book is an attempt to bring together and place in untechnical form the most important of these facts gathered from sources many of which are at present inaccessible to the general reader, perhaps even to many physicians and entomologists.

    In order that the reader who is not a specialist in medicine or entomology may more readily understand the intimate biological relations of the animals and parasites to be discussed it seems desirable to call attention first to their systematic relations and to review some of the important general facts in regard to their structure and life-history. This, it is believed, will make even the most complex special interrelations of some of these organisms readily understandable by all. Those who are already more or less familiar with these things may find the bibliography of use for more extended reading.

    My thanks are due to Prof. V.L. Kellogg for reading the manuscript and offering helpful suggestions and criticisms.

    Unless otherwise credited the pictures are from photographs taken by the author in the laboratory and field. As many of these are pictures of live specimens it is believed that they will be of interest as showing the insects, not as we think they should be, but as they actually are. Mr. J.H. Paine has given me valuable aid in preparing these photographs.

    R.W.D.

    Stanford University, California,

    March, 1910.


    CONTENTS


    ILLUSTRATIONS


    INSECTS AND DISEASE


    CHAPTER I

    PARASITISM AND DISEASE

    PARASITES

    he dictionary says that a parasite is a living organism, either animal or plant, that lives in or on some other organism from which it derives its nourishment for a whole or part of its existence. This definition will serve as well as any, as it seems to include all the forms that might be classed as parasites. As a general thing, however, we are accustomed to think

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