 | Charles Darwin, Frederick Burkhardt - 1985 - 726 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... | |
 | Charles Darwin - 1996 - 382 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... | |
 | Edmund Blair Bolles - 1999 - 518 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... | |
 | Alfred Russel Wallace - 2002 - 1002 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... | |
 | Alfred Russel Wallace - 2003 - 464 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...therefore, that each year an immense number of birds must perish - as many in fact as are born; and as in the lowest calculation the progeny are each year twice... | |
 | Michael Shermer - 2002 - 448 lehte
...Yet it is evident that this does not happen; indeed, it cannot happen because in a short span of time "the population must have reached its limits, and...very few years after the origin of each species." The reason is that life is Hobbesian — nasty, brutish, and short — as borne out in this ornithological... | |
 | Charles Darwin - 2003 - 676 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... | |
 | 1885 - 662 lehte
...than two thousand millions ")* — whereas we have no reason to believe that the number of birds in any country increases at all in fifteen or in one...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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... 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... 
