 | 1860 - 982 páginas
...and I have taken some pains to estimate its probable minimum rate of natural increase : it will bo under the mark to assume, that it breeds when thirty...forth three pairs of young in this interval ; if this bo so, at the end of the fifth century there would be alive fifteen million elephants, descended from... | |
 | Nicholas Patrick Wiseman - 1860 - 594 páginas
...animals, and I have taken some pains to estimate its probable minimum rate of natural increase : it will be under the mark to assume that it breeds when thirty...breeding till ninety years old, bringing forth three pair of young in this interval; if this be so, at the end of the fifth century there would be alive... | |
 | John Holmes Agnew, Walter Hilliard Bidwell, Henry T. Steele - 1860 - 612 páginas
...have taken some pains to estimate its probable minimum rate of nutur-.il increase ; it will be tinder the mark to assume that it breeds when thirty years...breeding till ninety years old, bringing forth three pair of young in this interval ; if this be so, at the end of the filth century there would be alive... | |
 | 1861 - 824 páginas
...animals ; and I have taken some pains to estimate its probable minimum rate of natural increase. It will be under the mark to assume that it breeds when thirty...breeding till ninety years old, bringing forth three pair of young in this interval. If this be PO, at the end of the fifth century, there would be alive... | |
 | Charles Darwin - 1861 - 470 páginas
...animals, and I have taken some pains to estimate its probable minimum rate of natural increase : it will be under the mark to assume that it breeds when thirty...breeding till ninety years old, bringing forth three pair of young in this interval ; if this be so, at the end of the fifth century there would be alive... | |
 | 1861 - 520 páginas
..." and I have taken some pains to esti"mate 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,... | |
 | 1861 - 788 páginas
..." and I have taken some pains to esti"mate 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,... | |
 | 1862 - 838 páginas
...breeds when thirty years old, and goes on breeding till ninety years old, bringing forth three pair of young in this interval ; if this be so, at the...of the fifth century there would be alive fifteen million elephants, descended from the first pair." — p. 64. Mr. Darwin is equally vast in speaking... | |
 | James Samuelson, Henry Lawson, William Sweetland Dallas - 1876 - 508 páginas
...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 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... | |
 | 1876 - 828 páginas
...animals, and I have taken some pains to calculate -its probable minimum rate of natural increase ; it will be under the mark to assume that it breeds when thirty...of the fifth century there would be alive fifteen million elephants, descended from the first pair." When now we come to consider the rapidity with which... | |
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The elephant is reckoned to be 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... 
