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Raamatud Books 1 - 10 of 16 on ... even identical with those of domestic animals, and are governed by the same laws....
" ... even identical with those of domestic animals, and are governed by the same laws as regards their permanence or further variation. But it is the object of the present paper to show that this assumption is altogether false, that there is a general... "
Contributions to the Theory of Natural Selection: A Series of Essays - Page 27
by Alfred Russel Wallace - 1870 - 384 lehte
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Zoological Journal of the Linnean Society, 3–4. köide

Linnean Society of London - 1859
...assumption is altogether false, that there is a general principle in nature which will cause many varietiet to survive the parent species, and to give rise to...which also produces, in domesticated animals, the tendeney of varieties to return to the parent form. The life of wild animals is a struggle for existence....
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Contributions to the Theory of Natural Selection

Alfred Russel Wallace - 1871
...overcome by assuming that such varieties have strict limits, and can never again vary further from the original type, although they may return to it, which,...tendency of varieties to return to the parent form. The Struggle for Existence. The life of wild animals is a struggle for existence. The full exertion...
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British and Foreign Medico-chirurgical Review, 47. köide

1871
...regards their permanence or further variation," states that the object of this paper is to prove " that this assumption is altogether false, that there...tendency of varieties to return to the parent form." Here we clearly have the idea of the formation of species by the method of natural selection, and the...
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British and Foreign Medico-chirurgical Review: Or, Quarterly ..., 47. köide

1871
...regards their permanence or further variation," states that the object of this paper is to prove " that this assumption is altogether false, that there...tendency of varieties to return to the parent form." Here we clearly have the idea of the formation of species by the method of natural selection, and the...
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Natural Selection and Tropical Nature: Essays on Descriptive and Theoretical ...

Alfred Russel Wallace - 1891 - 492 lehte
...overcome by assuming that such varieties have strict limits, and can never again vary further from the original type, although they may return to it, which,...tendency of varieties to return to the parent form. The Struggle for Existence The life of wild animals is a struggle for existence. The full exertion...
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The Popular Science Monthly, 60. köide

1902
...overcome by assuming that such varieties have strict limits, and can never again vary further from the original type, although they may return to it, which,...tendency of varieties to return to the parent form. The life of wild animals is a struggle for existence. The full exertion of all their faculties and...
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Zoologist: A Monthly Journal of Natural History, 16. köide

Edward Newman, James Edmund Harting - 1858
...not certainly proved. It will be observed that this argument rests entirely on the assumption, lhat varieties occurring in a state of nature are in all...tendency of varieties to return to the parent form. The life of wild animals is a struggle for existence. The full exertion of all their faculties and...
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Evolution: Genesis and Revelations: With Readings from Empedocles to Wilson

C. Leon Harris - 1981 - 339 lehte
...analogy of the domesticated animals, is considered to be highly probable, if not certainly proved. and to give rise to successive variations departing...tendency of varieties to return to the parent form. The life of wild animals is a struggle for existence. The full exertion of all their faculties and...
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The Correspondence of Charles Darwin: 1858-1859

Charles Darwin, Frederick Burkhardt, Sydney Smith - 1985 - 671 lehte
...overcome by assuming that such varieties have strict limits, and can never again vary further from the original type, although they may return to it, which,...tendency of varieties to return to the parent form. The life of wild animals is a struggle for existence. The full exertion of all their faculties and...
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The Growth of Biological Thought: Diversity, Evolution, and Inheritance

Ernst Mayr - 1982 - 974 lehte
...however, that the parallelism is not complete. Wallace states his thesis with extraordinary clarity: "There is a general principle in nature which will...departing further and further from the original type" (1858: 54). The language in which this observation is presented is rather typological; Wallace's conclusion,...
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