Disease and Its Causes by William Thomas Councilman (early reader books .TXT) đź“•
Living matter occurs always in the form of small masses called"cells," which are the living units. The cells vary in form, structureand size, some being so large that they can be seen with the nakedeye, while others are so small that they cannot be distinctly seenwith the highest power of the microscope. The living thing or organismmay be composed of a single cell or, in the case of the higher animalsand plants, may be formed of great numbers of cells, those of asimilar character being combined in masses to form organs such as theliver and brain.
In each cell there is a differentiated area constituting a specialstructure, the nucleus, which contains a pe
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Title: Disease and Its Causes
Author: William Thomas Councilman
Release Date: March 8, 2005 [eBook #15283]
Language: English
Character set encoding: ISO-8859-1
***START OF THE PROJECT GUTENBERG EBOOK DISEASE AND ITS CAUSES***
E-text prepared by Robert Shimmin, Carol David, Joshua Hutchinson,
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By W. T. Councilman, A.M., M.D., LL.D.
Professor of Pathology, Harvard University
NEW YORK
HENRY HOLT AND COMPANY
LONDON
WILLIAMS AND NORGATE
Originally published 1913
In this little volume the author has endeavored to portray disease as life under conditions which differ from the usual. Life embraces much that is unknown and in so far as disease is a condition of living things it too presents many problems which are insoluble with our present knowledge. Fifty years ago the extent of the unknown, and at that time insoluble questions of disease, was much greater than at present, and the problems now are in many ways different from those in the past. No attempt has been made to simplify the subject by the presentation of theories as facts.
The limitation as to space has prevented as full a consideration of the subject as would be desirable for clearness, but a fair division into the general and concrete phases of disease has been attempted. Necessarily most attention has been given to the infectious diseases and their causes. This not only because these diseases are the most important but they are also the best known and give the simplest illustrations. The space given to the infectious diseases has allowed a merely cursory description of the organic diseases and such subjects as insanity and heredity. Of the organic diseases most space has been devoted to disease of the heart. There is slight consideration of the environment and social conditions as causes of disease.
Very few authors are mentioned in the text and no bibliography is given. There is lack of literature dealing with the general aspects of disease; the book moreover is not written for physicians, and the list of investigators from whose work the knowledge of disease has been derived would be too long to cite.
It has been assumed that the reader has some familiarity with elementary anatomy and physiology, and these subjects have been considered only as much as is necessary to set the scene for the drama. I am indebted to my friend, Mr. W. R. Thayer, for patiently enduring the reading of the manuscript and for many suggestions as to phrasing.
Definition Of Disease.—Characteristics Of Living Matter.—Cells As The Living Units.—Amoeba As Type Of A Unicellular Animal.—The Relation Of Living Matter To The Environment.—Capacity Of Adaptation To The Environment Shown By Living Matter—Individuality Of Living Matter.—The Causes Of Disease.—Extrinsic.—The Relation Of The Human Body To The Environment.—The Surfaces Of The Body.—The Increase Of Surface By Gland Formation.—The Real Interior Of The Body Represented By The Various Structures Placed Between The Surfaces.—The Fluids Of The Body.—The Nervous System.—The Heart And Blood-Vessels.—The Cells Of The Blood.—The Ductless Glands.
There is great difficulty, in the case of a subject so large and complex as is disease, in giving a definition which will be accurate and comprehensive. Disease may be defined as "A change produced in living things in consequence of which they are no longer in harmony with their environment." It is evident that this conception of disease is inseparable from the idea of life, since only a living thing can become diseased. In any dead body there has been a preëxisting disease or injury, and, in consequence of the change produced, that particular form of activity which constitutes life has ceased. Changes such as putrefaction take place in the dead body, but they are changes which would take place in any mass similarly constituted, and are not influenced by the fact that the mass was once living. Disease may also be thought of as the negation of the normal. There is, however, in living things no definite type for the normal. An ideal normal type may be constructed by taking the average of a large number of individuals; but any single individual of the group will, to a greater or less extent, depart from it. No two individuals have been found in whom all the Bertillon measurements agree. Disease has reference to the individual; conditions which in one individual would be regarded as disease need not be so regarded in another. Comparisons between health and disease, the normal and the abnormal, must be made not between the ideal normal and abnormal, but between what constitutes the normal or usual and the abnormal in a particular individual.
The conception of disease is so inseparably associated with that of life that a brief review of the structure and properties of living things is necessary for the comprehension of the definition which has been given. Living matter is subject to the laws which govern matter, and like matter of any other sort it is composed of atoms and molecules. There is no force inherent in living matter, no vital force independent of and differing from the cosmic forces; the energy which living matter gives off is counterbalanced by the energy which it receives.
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