 ... 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完整檢視 - 關於此書
 | United States. Department of Agriculture - 1868 - 620 頁
...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... | |
 | United States. Department of Agriculture - 1868 - 618 頁
...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... | |
 | 1876 - 760 頁
...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... | |
 | Charles Darwin - 1876 - 544 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...hand, long-continued close interbreeding is injurious. Various general considerations have had much influence in leading me to this conclusion ; but the reader... | |
 | T Warren O'Neill - 1880 - 482 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... | |
 | Staff - 1891 - 542 頁
...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... | |
 | Charles Darwin - 1896 - 734 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...hand, long-continued close interbreeding is injurious. Various general considerations have had much influence in leading me to this conclusion; but the reader... | |
 | 1914 - 596 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." PROOFS NOT ALL CONVINCING. When the proofs that Darwin gives, many of which have already found their... | |
 | 1914 - 634 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." PROOFS NOT ALL CONVINCING. When the proofs that Darwin gives, many of which have already found their... | |
 | Frederick Blackmar Mumford - 1917 - 408 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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