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" The action of climate seems at first sight to be quite independent of the struggle for existence ; but in so far as climate chiefly acts in reducing food, it brings on the most severe struggle between the individuals, whether of the same or of distinct... "
The Origin of Species
by Charles Darwin - 19?? - 238 pages
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The American Journal of Science and Arts

Science - 1860
...drought, I believo to be the most effective of all checks. I estimated that tlie winter of 1854-55 destroyed four-fifths of the birds in my own grounds;...cold, acts directly, it will be the least vigorous, or those which have got least food through the advancing winter, which will suffer most. "When we travel...
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On the Origin of Species by Means of Natural Selection; Or, The Preservation ...

Charles Darwin - Evolution - 1861 - 440 pages
...or drought, I believe to be the most effective of all checks. I estimated that the winter of 1854-55 destroyed four-fifths of the birds in my own grounds...cold, acts directly, it will be the least vigorous, or those which have got least food through the advancing winter, which will suffer most. When we travel...
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Darwinia: Essays and Reviews Pertaining to Darwinism

Asa Gray - Evolution (Biology) - 1877 - 404 pages
...or drought I believe to be the most effective of all checks. I estimated that the winter of 1854-'55 destroyed four-fifths of the birds in my own grounds;...cold, acts directly, it will be the least vigorous, or those which have got least food through the advancing winter, which will suffer most. When we travel...
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The refutation of Darwinism; and the converse theory of development; based ...

T Warren O'Neill - 1880
...that ten per cent. is an extraordinarily severe mortality from epidemics with man. The action of the climate seems at first sight to be quite independent...cold, acts directly, it will be the least vigorous, or those which have got least food, through the advancing winter, which will suffer most. When we travel...
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The Origin of Species by Means of Natural Selection, Or, The ..., Volume 1

Charles Darwin - Evolution - 1896
...young elephant protected by its dam. Climate plays an important part in determining the average numbers of a species, and periodical seasons of extreme cold...so far as climate chiefly acts in reducing food, it bring on the most severe struggle between the individuals, whether of the same or of distinct species,...
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Charles Darwin's Works: The origin of species by means of natural selection ...

Charles Darwin, Sir Francis Darwin - Science - 1896
...checks. I estimated (chiefly from the greatly reduced numbers of nests in the spring) that the w inter of 1854-5 destroyed four-fifths of the birds in my...so far as climate chiefly acts in reducing food, it bring on the most severe struggle between the individuals, whether of the same or of distinct species,...
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INTELLIGENCE IN PLANTS AND ANIMALS

THOMAS G GENTRY - 1900
...altogether independent of the Struggle for Existence; but in so far as it chiefly acts in the reduction of food, it brings on the most severe struggle between the individuals, whether of the same or different species, which subsist on the same kind of fare. Even when climate, extreme cold for example,...
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Intelligence in Plants and Animals: Being a New Edition of the Author's ...

Thomas George Gentry - Animal intelligence - 1900 - 489 pages
...altogether independent of the Struggle for Existence ; but in so far as it chiefly acts in the reduction of food, it brings on the most severe struggle between the individuals, whether of the same or different species, which subsist on the same kind of fare. Even when climate, extreme cold for example,...
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An easy outline of evolution

Dennis Hird - Evolution - 1903 - 240 pages
...when we remember that ten per cent, is an extraordinarily severe mortality from epidemics with men. The action of climate seems at first sight to be quite...struggle between the individuals, whether of the same or distinct species, which subsist on the same kind of food " (P- 54). When a species, owing to highly...
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Evolution and Adaptation

Thomas Hunt Morgan - Adaptation (Biology). - 1903 - 470 pages
...species, and periodical seasons of extreme cold or drought seem to be the most effective of all checks." "The action of climate seems at first sight to be...struggle for existence ; but in so far as climate acts in reducing food, it brings on the most severe struggle between the individuals, whether of the...
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