The Causation of Disease An Exposition On the Ultimate Factors Which Induce It
The Causation of Disease An Exposition On the Ultimate Factors Which Induce It
Harry Campbell
The book The Causation of Disease An Exposition On the Ultimate Factors Which Induce It was written by author Harry Campbell Here you can read free online of The Causation of Disease An Exposition On the Ultimate Factors Which Induce It book, rate and share your impressions in comments. If you don't know what to write, just answer the question: Why is The Causation of Disease An Exposition On the Ultimate Factors Which Induce It a good or bad book?
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We may be sure that man suffered from zymotic disease long before he took on his present shape, far down in the genealogical tree. How, then, are we to explain the disappearance of these diseases ? Many of them have doubtless vanished with the E which brought them into being. The great epidemics of the Middle Ages arose out of grossly impure hygienic conditions, and the pathogenic germs causing them disappeared with the hygienic improvement. It may be that the germs died right out ; or we may s...uppose them to have lost their patho- genecy through natural variation, for it is well known that unicellular organisms, in common with the more complex forms of life, are capable of being modified by a modification of their E. It is highly probable, however, that perfect adapta- tion to them has taken place in the past by natural selec- tion. Let it ever be borne in mind that man, like all other living things, has gradually evolved by a continued adaptation to his E. He has been gradually moulded so as to fit more or fute it, but this is no argument against isolation ; the number of individuals attacked " during any given epidemic " might be greater, but the proportion of individuals attacked during a given long period of time, would not be nearly so great, although the process of natural selection would be interfered with, and the number of the susceptible thus increased, but no mention was made of the influence of natural selection during the discussion of this subject in theBritish Medical Journal.
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