 | 1861 - 788 páginas
...its probable minimum rate of " natural increase. It will be under the "mark to assume that it breeds when " thirty years old, and goes on breeding " until ninety years old, bringing forth " three pairs of young in this interval. " If this be so, at the end of the fifth " century there would... | |
 | 1861 - 520 páginas
...its probable minimum rate of " natural increase. It will be under the "mark to assume that it breeds when " thirty years old, and goes on breeding ' until ninety years old, bringing forth ' three pairs of young in this interval. ' If this be so, at the end of the fifth ' century there would... | |
 | James Samuelson, Henry Lawson, William Sweetland Dallas - 1876 - 508 páginas
...It will be safest to assume that it begins breeding when thirty years old, and goes on breeding till ninety years old, bringing forth six young in the interval, and surviving till 100 years old. If this be so, after a period of from 740 to 750 years, there would be nearly nineteen... | |
 | Charles Darwin - 1875 - 504 páginas
...it will be safest to assume that it begins breeding when thirty years old, and goes on breeding till ninety years old, bringing forth six young in the interval, and surviving till one hundred years old ; if this be so, after a period of from 740 to 750 years there would be nearly... | |
 | Francis Amasa Walker - 1876 - 432 páginas
...It will be safest to assume that it begins breeding when thirty years old, and goes on breeding till ninety years old, bringing forth six young in the interval, and surviving till one hundred years old ; if this be so, after a period of from seven hundred and forty to seven hundred... | |
 | Francis Amasa Walker - 1876 - 440 páginas
...It will be safest to assume that it begins breeding when thirty years old, and goes on breeding till ninety years old, bringing forth six young in the interval, and surviving till one hundred years old ; if this be so, after a period of from seven hundred and forty to seven hundred... | |
 | Charles Darwin - 1884 - 396 páginas
...it will be safest to assume that it begins breeding when thirty years old, and goes on breeding till ninety years old, bringing forth six young in the interval, and surviving till one hundred years old ; if this be so, after a period of from seven hundred and forty to seven hundred... | |
 | Joseph Young Bergen, Fanny Dickerson Bergen - 1884 - 266 páginas
...It will be safest to assume that it begins breeding when thirty years old, and goes on breeding till ninety years old, bringing forth six young in the interval, and surviving till one hundred years old : if this be so, after a period of from seven hundred forty to seven hundred... | |
 | 1881 - 340 páginas
...it will be safest to assume that it begins breeding when thirty years old, and goes on breeding till ninety years old, bringing forth six young in the interval, and surviving till one hundred years old ; if this be so, after a period of from 740 to 750 years, there would be nearly... | |
 | 1886 - 548 páginas
...It will be safest to assume that it begins breeding when thirty years old and goes on breeding till ninety years old, bringing forth six young in the interval, and surviving till one hundred years old ; if this be so, after a period of from seven hundred and for,ty to seven hundred... | |
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The elephant is reckoned the slowest breeder of all known animals, and I have taken some pains to estimate its probable minimum rate of natural increase; it will be safest to assume that it begins breeding when thirty years old, and goes on breeding till... 
