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" ... that the comparative abundance or scarcity of the individuals of the several species is entirely due to their organization and resulting habits, which, rendering it more difficult to procure a regular supply of food and to provide for their personal... "
Journal of the Proceedings of the Linnean Society: Zoology - Page 57
1859
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Zoologist: A Monthly Journal of Natural History, 17. köide

1859 - 512 lehte
...regular supply of food and to provide for their personal safety in some cases than in others, can only be balanced by a difference in the population, which have to exist in a given area." This, it seems to me, is far more general and comprehensive than is warranted by the facts of the case...
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Contributions to the Theory of Natural Selection: A Series of Essays

Alfred Russel Wallace - 1870 - 458 lehte
...regular supply of food and to provide for their personal safety in some cases than in others, can only be balanced by a difference in the population which have...remarks have a direct and very important application. Useful Variations will tend to Increase ; useless or hurtful Variations to Diminish. Most or perhaps...
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Contributions to the Theory of Natural Selection: A Series of Essays

Alfred Russel Wallace - 1871 - 434 lehte
...regular supply of food and to provide for their personal safety in some cases than in others, can only be balanced by a difference in the population which have to exist in a given area—we shall be in a condition to proceed to the consideration of varieties, to which the preceding...
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Contributions to the Theory of Natural Selection: A Series of Essays

Alfred Russel Wallace - 1871 - 412 lehte
...regular supply of food and to provide for their personal safety in some cases than in others, can only be balanced by a difference in the population which have to exist in a given area—we shall be in a condition to proceed to the consideration of varieties, to which the preceding...
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Natural Selection and Tropical Nature: Essays on Descriptive and Theoretical ...

Alfred Russel Wallace - 1891 - 516 lehte
...supply of food and to provide for their personal safety 1 in some cases than in others, can only be balanced by a difference in the population which have...remarks have a direct and very important application. Useful Variations will tend to Increase ; useless or hurtful Variations to Diminish Most or perhaps...
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Outlines of evolutionary biology

Arthur Dendy - 1912 - 478 lehte
...of food supply, &c., must diminish in numbers, and, in extreme cases, become altogether extinct." " Most or perhaps all the variations from the typical...must have some definite effect, however slight, on ihe habits or capacities of the individuals. Even a change of colour might, by rendering them more...
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Scientific Discovery: Case Studies, 2. köide

Thomas Nickles - 1980 - 418 lehte
...T, there is always the logical possibility of a third scientist C who gets to T but not on route R . Most or perhaps all the variations from the typical...slight, on the habits or capacities of the individuals. . . . [Consequently, if] "any species should produce a variety having slightly increased powers of...
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The Growth of Biological Thought: Diversity, Evolution, and Inheritance

Ernst Mayr - 1982 - 996 lehte
...population size, on stabilizing selection (elimination), and on competition between species. He is now "in a condition to proceed to the consideration of...remarks have a direct and very important application." In the ensuing discussion Wallace applies the term "variety" to variant individuals, that is, individuals...
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Evolution and Ecology: The Pace of Life

K. D. Bennett - 1997 - 272 lehte
...regular supply of food and to provide for their personal safety in some cases than in others, can only be balanced by a difference in the population which have to exist in a given area (Wallace 1859, p. 57). He then noted the existence of varieties, and that most changes would affect...
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Galileo's Commandment: 2,500 Years of Great Science Writing

Edmund Blair Bolles - 1999 - 518 lehte
...regular supply of food and to provide for their personal safety in some cases than in others, can only be balanced by a difference in the population which have...remarks have a direct and very important application. Useful Variations Will Tend to Increase; Useless or Hurtful Variations to Diminish Most or perhaps...
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