 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...  Political Economy - Page 310by Francis Amasa Walker - 1883 - 490 pagesFull view - About this book
 | Charles Darwin - 1875 - 504 pages
...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...years old ; if this be so, after a period of from 740 to 750 years there would be nearly nineteen million elephants alive, descended from the first pair.... | |
 | Francis Amasa Walker - Labor economics - 1876 - 440 pages
...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...nineteen million elephants descended from the first pair. . . . Even slow-breeding man has doubled in twentyfive years, and at this rate in a few thousand years... | |
 | Francis Amasa Walker - Social history - 1876 - 436 pages
...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...nineteen million elephants descended from the first pair. . . . Even slow-breeding man has doubled in twentyfive years, and at this rate in a few thousand years... | |
 | Charles Darwin - Evolution - 1884 - 396 pages
...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...forty to seven hundred and fifty years, there would be nearly nineteen million elephants alive, descended from the first pair. DEATH INEVITABLE IN THE FIGHT... | |
 | Joseph Young Bergen, Fanny Dickerson Bergen - Evolution - 1884 - 266 pages
...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...if this be so, after a period of from seven hundred forty to seven hundred fifty years, there would be nearly nineteen million elephants alive, descended... | |
 | 1881 - 340 pages
...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...years old ; if this be so, after a period of from 740 to 750 years, there would be nearly nineteen million elephants alive, descended from the first... | |
 | Literature - 1886 - 548 pages
...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...for,ty to seven hundred and fifty years there would be nearly nineteen million elephants alive, descended from the first pair. But we have better evidence... | |
 | Jacob Gould Schurman - Ethics - 1887 - 292 pages
...the slowest breeder of all known animals. Yet, at the minimum rate of increase, a single pair would " after a period of from seven hundred and forty to seven hundred and fifty years " have " nearly nineteen million" living descendants. " Even slow-breeding man has doubled in twenty-five... | |
 | Joseph Young Bergen, Fanny Dickerson Bergen - Evolution - 1890 - 288 pages
...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...if this be so, after a period of from seven hundred forty to seven hundred fifty years, there would be nearly nineteen million elephants alive, descended... | |
 | Franklin Monroe Sprague - Socialism - 1892 - 528 pages
...animals; ... it begins to breed when thirty years old, and goes on breeding till ninety years old, bringing forth six young in the interval and surviving...forty to seven hundred and fifty years, there would be nearly 19,000,000 elephants alive descended from the first pair. Even slow-breeding man has doubled... | |
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