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Raamatud Books 1 - 10 of 13 on ... die either by violence or want of food. Yet at this rate how tremendous would....
" ... die either by violence or want of food. Yet at this rate how tremendous would be the increase in a few years from a single pair! A simple calculation will show that in fifteen years each pair of birds would have increased to nearly ten millions! whereas... "
Natural Selection and Tropical Nature: Essays on Descriptive and Theoretical ... - Page 24
by Alfred Russel Wallace - 1891 - 492 lehte
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The Edinburgh Review: Or Critical Journal, 134. köide

1871
...show that in fifteen years, each pair of birds would have increased to nearly two thousand millions ! Whereas we have no reason to believe that the number...of increase, the population must have reached its limn-. and have become stationary, in a very few years after the origin of each species. An immense...
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Principles of Geology: Or, The Modern Changes of the Earth and Its ..., 2. köide

Sir Charles Lyell - 1868 - 671 lehte
...four times in their life, each would at this rate increase in fifteen years to nearly ten millions, whereas we have no reason to believe that the number...birds of any country increases at all in fifteen or even in 150 years. It is evident, therefore, that each year an immense number of birds must perish,...
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Contributions to the Theory of Natural Selection: A Series of Essays

Alfred Russel Wallace - 1870 - 384 lehte
...This is under estimated. The number would really amount to more than two thousand millions! crease the population must have reached its limits, and have...therefore, that each year an immense number of birds must perish — as many in fact as are born ; and as on the lowest calculation the progeny are each year...
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Contributions to the Theory of Natural Selection: A Series of Essays

Alfred Russel Wallace - 1870 - 384 lehte
...fifteen years each pair of birds would have increased to nearly ten millions ! * whereas wo haveno reason to believe that the number of the birds of...in one hundred and fifty years. With such powers of in* This is under estimated. The number would really amount to more than two thousand millions! crease...
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Contributions to the Theory of Natural Selection

Alfred Russel Wallace - 1871
...will show that in fifteen years each pair of birds would have increased to nearly ten millions ! * whereas we have no reason to believe that the number...in one hundred and fifty years. With such powers of in* This is under estimated. The number would really amount to more than two thousand millions I crease...
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Creeds of the day; or, Collated opinions of reputable thinkers, 3 ..., 1. köide

Henry Coke - 1883
...only in their lives. In fifteen years the numbers would amount to more than two thousand millions. "Whereas we have no reason to believe that the number...all in fifteen or in one hundred and fifty years." He also distinctly enunciated the principle of natural selection. Speaking of the tendency of useful...
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The Popular Science Monthly, 60. köide

1902
...calculation will show that in fifteen years each pair of birds would have increased to nearly ten millions! whereas we have no reason to believe that the number...therefore, that each year an immense number of birds must perish — as many in fact as are born; and as on the lowest calculation the progeny are each year...
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Outlines of Evolutionary Biology

Arthur Dendy - 1912 - 454 lehte
...calculation will show that in fifteen years each pair of birds would have increased to nearly ten millions ! Whereas we have no reason to believe that the number...therefore, that each year an immense number of birds must perish — as many in fact as are born. . . . It is, as we commenced by remarking, ' a struggle for...
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Zoologist: A Monthly Journal of Natural History, 16. köide

Edward Newman, James Edmund Harting - 1858
...calculation will show that in fifteen years each pair of birds would have increased to nearly ten millions ! whereas we have no reason to believe that the number...therefore, that each year an immense number of birds must perish — as many in fact as are born ; and as on the lowest calculation the progeny are each year...
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Evolution: Genesis and Revelations: With Readings from Empedocles to Wilson

C. Leon Harris - 1981 - 339 lehte
...would have increased to nearly ten millions! whereas we have no reason to believe that the number of birds of any country increases at all in fifteen or...a very few years after the origin of each species. lt is evident, therefore, that each year an immense number of birds must perish — as many in fact...
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