 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...  Animals: A Text-book of Zoology - Стр. 116авторы: David Starr Jordan, Vernon Lyman Kellogg, Harold Heath - 1905Полный просмотр - Подробнее о книге
 | 1861 - Страниц: 788
...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 - Страниц: 520
...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 - Страниц: 508
...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 - Страниц: 504
...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 - Страниц: 432
...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 - Страниц: 440
...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 - Страниц: 396
...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 - Страниц: 266
...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 - Страниц: 340
...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 - Страниц: 548
...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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