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" Unless the characteristics and conformation of the two breeds are altogether averse to each other, nature opposes no barrier to their successful admixture ; so that, in the course of time, by the aid of selection and careful weeding, it is practicable... "
The Variation of animals and plants under domestication v. 2 - 第 75 頁
Charles Darwin 著 - 1876
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Journal of the Royal Agricultural Society of England, 第 20 卷

Royal Agricultural Society of England - 1859 - 624 頁
...altogether averse to each other, nature opposes no barrier to their successful admixture ; so that, in the course of time, by the aid of selection and...weeding, it is practicable to establish a new breed altogether. This, in fact, has been the history of our principal breeds. The Leicester was notoriously...
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The Journal of the Royal Agricultural Society

Royal Agricultural Society - 1859 - 618 頁
...altogether averse to each other, nature opposes no barrier to their successful admixture ; so that, in the course of time, by the aid of selection and...weeding, it is practicable to establish a new breed altogether. This, in fact, has been the history of our principal breeds. The Leicester was notoriously...
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The Principles of Breeding: Or, Glimpses at the Physiological Laws Involved ...

Stephen Lincoln Goodale - 1861 - 176 頁
...altogether averse to each other, nature opposes no barrier to their successful admixture ; so that in the course of time, by the aid of selection and...weeding, it is practicable to establish a new breed altogether. This, in fact, has been the history of our principal breeds. * * * We confess that we cannot...
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Transactions of the New-York State Agricultural Society for the Year ..., 第 24 卷

New York State Agricultural Society - 1865 - 738 頁
...altogether adverse to each other, nature opposes no barrier to their successful admixture; so that, in the course of time, by the aid of selection and...weeding, it is practicable to establish a new breed altogether. This, in fact, has been the history of our principal breeds. The Leicester was notoriously...
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Report of the Secretary, 第 6 卷

Michigan. State Board of Agriculture - 1867 - 534 頁
...altogether averse to each other, nature opposes no barrier to their successful admixture; so that, in course of time, by the aid of selection and careful...weeding, it is practicable to establish a new breed altogether. This, in fact, has been the history of our principal breeds. The Leicester was notoriously...
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Practical farming: in a series of treatises by R.O. Pringle, professor [A.J ...

Robert Oliphant Pringle - 1868 - 918 頁
...are altogether averse to each other, Nature opposes no barrier to their successful admixture, so that in the course of time, by the aid of. selection and careful breeding, it is practicable to establish a new breed altogether. This in fact has been the history...
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Cattle, Sheep, and Deer: (containing Also Remarks on the Game Laws and ...

Duncan George Forbes Macdonald - 1872 - 862 頁
...altogether adverse to each other, Nature opposes no barrier to their successful admixture ; so that, in the course of time, by the aid of selection and...weeding, it is practicable to establish a new breed altogether. This, in fact, has been the history of our principal breeds. The Leicester was notoriously...
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The History, Structure, Economy and Diseases of the Sheep

William Charles Spooner - 1874 - 464 頁
...are altogether averse to each other, nature opposes no barrier to their successful admixture, so that in the course of time, by the aid of selection and...weeding, it is practicable to establish a new breed altogether. This, in fact, has been the history of our principal breeds. The Leicester was notoriously...
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Stock-breeding: A Practical Treatise on the Applications of the Laws of ...

Manly Miles - 1878 - 440 頁
...of Agriculture, vol. i., pp. 170-179. 8 " Code of Agriculture," p. 95. cessful admixture ; so that, in the course of time, by the aid of selection and...weeding, it is practicable to establish a new breed altogether.1 . . . Let us conclude," he then says, "by repeating the advice that, when equal advantages...
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Habit and Intelligence: A Series of Essays on the Laws of Life and Mind

Joseph John Murphy - 1879 - 650 頁
...attains its maximum.1 But, to return to the subject of domestic animals : — " In the course of time and by the aid of selection and careful weeding, it is...but even then an occasional reversion, or failure to breed true, may be expected." 2 " Himalayan Rabbit." — There are, however, some instances of very...
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