 | American Association for the Advancement of Science - 1858 - 972 pàgines
...7. Mules that are fertile among themselves through an indefinite number of generations. The cases 1 to 5 are known to be established facts in nature ;...single generation, instead of favoring the idea that perpetuated fertile hybridity is possible, is a speaking protest against a principle that would ruin... | |
 | 1857 - 924 pàgines
...7. Mules that are fertile among themselves through an indefinite number of generations. The cases 1 to 5 are known to be established facts in nature ;...of hybridity between the horse and the ass, species vety closely related, reaching its end in one single generation, instead of favoring the idea that... | |
 | 1857 - 536 pàgines
...0. Mules that are fertile among themselves through an indefinite number of generations, The cases 1 to 5 are known to be established facts in nature ;...off. The short run of hybridity between the horse and tha ass, species very closely related, reaching its end in one sifigle generation, instead of favoring... | |
 | 1857 - 530 pàgines
...unnatural play of forces or arrangements to bring them about. Again, in the animal kingdom, thftre is the same aversion- in nature to intermixture, and...single generation, instead* of favoring the idea that perpetuated fertile hybridity is possible, is a speaking protest against a principle that would ruin... | |
 | 1857 - 588 pàgines
...of fertile hybridity are fewer than among plants. Ann. If Mag. N. Hist. Ser. 2. Vol. xx. Suppl. 32 Moreover, in both kingdoms, if hybridity be begun,...reaching its end in one single generation, instead of favouring the idea that perpetuated fertile hybridity is possible, is a speaking protest against a... | |
 | 1857 - 532 pàgines
...Moreover, in both kingdoms, if hybridity be begun, nature commences at once to purify herself as of atj ulcer on the system. It is treated like a disease,...single generation, instead of favoring the idea that perpetuated fertile hybridity is possible, is a speaking protest against a principle that would ruin... | |
 | 1858 - 482 pàgines
...7. Mules that are fertile among themselves through an indefinite number of generations. The cases 1 to 5 are known to be established facts in nature ;...single generation, instead of favoring the idea that perpetuated fertile hybridity is possible, is a speaking protest against a principle that would ruin... | |
 | American Association for the Advancement of Science - 1858 - 474 pàgines
...7. Mules that are fertile among themselves through an indefinite number of generations. The cases 1 to 5 are known to be established facts in nature ;...single generation, instead of favoring the idea that perpetuated fertile hybridity is possible, is a speaking protest against a principle that would ruin... | |
 | 1857 - 932 pàgines
...7. Mules that are fertile among themselves through an indefinite number of generations. The cases 1 to 5 are known to be established facts in nature ;...single generation, instead of favoring the idea that perpetuated fertile hybridity is possible, is a speaking protest against a principle that would ruin... | |
 | 1858 - 618 pàgines
...examples under the heads 2 to 5 become severally less and less numerous, and art must generally use au unnatural play of forces or arrangements to bring...single generation, instead of favoring the idea that perpetuated fertile hybridity is possible, is a speaking protest against a principle that would ruin... | |
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The examples under the heads 2 to 5 become severally less and less numerous, and art must generally use an unnatural play of forces or arrangements to bring them about. Again, in the animal kingdom, there is the same aversion in nature to intermixture,... 
