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" ... actually ill, are fully capable of procreating their kind. Close interbreeding, on the other hand, often induces sterility ; and this indicates something quite distinct from the augmentation of morbid tendencies common to both parents. The evidence... "
Public Documents of Massachusetts - 第 189 頁
Massachusetts 著 - 1875
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Report of the Secretary of Agriculture ...

United States. Department of Agriculture - 1868
...Tho evidence immediately to be given convinces me that it is n great law of nature that all organized beings profit from an occasional cross with individuals not closely related to them by blood ; and that, on the other hand, long-continued, close interbreeding is injurions. — Variation...
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Report of the Commissioner of Agriculture for the Year ...

United States. Department of Agriculture - 1868
...The evidence immediately to be given convinces me that it is a great law of nature that all organized beings profit from an occasional cross with individuals not closely related to them by blood ; and that, on the other hand, long-continued, close interbreeding U injurious. — Variation...
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Wallace's Monthly, 第 2 卷

1876
...extent in adult life. Inbreeding — Crossing. — Close inbreeding has a tendency to induce sterilitv, while crossing is universally regarded by breeders...organic beings profit from an occasional cross with individuáis not closely related to them in blood ; and that, on the other hand, long-continued close...
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The Variation of animals and plants under domestication v. 2, 第 2 卷

Charles Darwin - 1876
...tendencies common to both parents. The evidence immediately to be given convinces me that it is a great law of nature, that all organic beings profit from...hand, long-continued close interbreeding is injurious. Various general considerations have had much influence in leading me to this conclusion ; but the reader...
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The refutation of Darwinism; and the converse theory of development; based ...

T. Warren O'Neill - 1880 - 453 頁
...was an excellent good term, before it was ill sorted ; therefore, scientists had need look to it), " that all organic beings profit from an occasional...blood; and, that, on the other hand, long-continued close-interbreeding is injurious. Various general considerations have had much influence in leading...
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Journal of the Bath and West of England Society and Southern Counties ...

Staff - 1891
...breeders' art : but he adds that, with the evidence before him, he is convinced that it is a great law of nature that all organic beings profit from...blood ; and that, on the other hand, long-continued interbreeding is injurious. He was aware that throughout the whole organic world elaborate provision...
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Charles Darwin's Works: The variation of animals and plants under ...

Charles Darwin - 1896
...tendencies common to both parents. The evidence immediately to be given convinces me that it is a great law of nature, that all organic beings profit from...hand, long-continued close interbreeding is injurious. Various general considerations have had much influence in leading me to this conclusion; but the reader...
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The Journal of Heredity

1914
...tendencies common to both parents. The evidence immediately to be given convinces me that it is a great law of nature, that all organic beings profit from...long-continued close interbreeding is injurious." PROOFS NOT ALL CONVINCING. When the proofs that Darwin gives, many of which have already found their...
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The Journal of Heredity, 第 5 卷

1914
...tendencies common to both parents. The evidence immediately to be given convinces me that it is a great law of nature, that all organic beings profit from...long-continued close interbreeding is injurious." PROOFS NOT ALL CONVINCING. When the proofs that Darwin gives, many of which have already found their...
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The Breeding of Animals

Frederick Blackmar Mumford - 1917 - 310 頁
...tendencies common to both parents. The evidence immediately to be given convinces me that it is a great law of nature, that all organic beings profit from...long-continued close interbreeding is injurious." Darwin's conclusions are based upon a very large number of observations. Experienced breeders who are...
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