 | 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... | |
 | Massachusetts - 1875 - 692 頁
...crossing is universally regarded by breeders as bringing vigor. Darwin regards it as an established law of nature, that all organic beings profit from...blood ; and that, on the other hand, long-continued close interbreeding is injurious. It is the belief of physiologists that every act of development tends... | |
 | Edward Lewis Sturtevant - 1875 - 60 頁
...crossing is universally regarded by breeders as bringing vigor. Darwin regards it as an established law of nature, that all organic beings profit from...blood; and that, on the other hand, long-continued close interbreeding is injurious. It is the belief of physiologists that every act of development tends... | |
 | 1876 - 760 頁
...crossing is universally regarded by breeders as bringing vigor. Darwin regards it as an established law of nature, that all 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
...augmentation of morbid tendencies common to both parents. The evidence immediately to be given convinces me that it is a great law of nature, that all organic...blood ; and that, on the other hand, long-continued close interbreeding is injurious. Various general considerations have had much influence in leading... | |
 | 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... | |
 | Charles Darwin - 1896 - 734 頁
...augmentation of morbid tendencies common to both parents. The evidence immediately to be given convinces me that it is a great law of nature, that all organic...blood ; and that, on the other hand, long-continued close interbreeding is injurious. Various general considerations have had much influence in leading... | |
 | 1914 - 596 頁
...augmentation of morbid tendencies common to both parents. The evidence immediately to be given convinces me that it is a great law of nature, that all organic...blood; and that, on the other hand, long-continued close interbreeding is injurious." PROOFS NOT ALL CONVINCING. When the proofs that Darwin gives, many... | |
 | 1914 - 634 頁
...augmentation of morbid tendencies common to both parents. The evidence immediately to be given convinces me that it is a great law of nature, that all organic...blood; and that, on the other hand, long-continued close interbreeding is injurious." PROOFS NOT ALL CONVINCING. When the proofs that Darwin gives, many... | |
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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 immediately to be given convinces me that it is a great law of... 
