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
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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