 | 1871 - 630 lehte
...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... | |
 | Sir Charles Lyell - 1868 - 692 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,... | |
 | Alfred Russel Wallace - 1870 - 414 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... | |
 | Alfred Russel Wallace - 1870 - 458 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... | |
 | Alfred Russel Wallace - 1871 - 412 lehte
...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... | |
 | Henry Coke - 1883 - 328 lehte
...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... | |
 | 1902 - 584 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; and as on the lowest calculation the progeny are each year... | |
 | Arthur Dendy - 1912 - 478 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... | |
 | 1858 - 478 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 ; and as on the lowest calculation the progeny are each year... | |
 | C. Leon Harris - 1981 - 360 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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... 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... 
