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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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Dairy Farming Projects

Carl Edwin Ladd - 1923 - 327 頁
...inter-breeding often induces sterility. The evidence immediately to be given convinces me that it is a great law of nature that all organic beings profit from...related to them in blood ; and that, on the other hand, long continued cross inbreeding is injurious." 1. Describe Gentry's work in inbreeding swine and the...
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