The Origin of Species by Means of Natural Selection, Or, The Preservation of Favored Races in the Struggle for Life: Reprinted from the Sixth London Edition, with All Additions and CorrectionsA. L. Burt Company, 1890 - 458페이지 |
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... crossed a barb with a spot , which is a white bird with a red tail and red spot on the forehead , and which notoriously breeds very true ; the mongrels were dusky and mottled . I then crossed one of the mongrel barb - fantails with a ...
... crossed a barb with a spot , which is a white bird with a red tail and red spot on the forehead , and which notoriously breeds very true ; the mongrels were dusky and mottled . I then crossed one of the mongrel barb - fantails with a ...
286 페이지
... crossed under the same cir- cumstances ; it depends in part upon the constitution of the individuals which happen to have been chosen for the experiment . So it is with hybrids , for their degree of fer- tility is often found to differ ...
... crossed under the same cir- cumstances ; it depends in part upon the constitution of the individuals which happen to have been chosen for the experiment . So it is with hybrids , for their degree of fer- tility is often found to differ ...
305 페이지
... crossed with the Nico- tiana glutinosa , always yielded hybrids not so sterile as those which were produced from the four other varieties when crossed with N. glutinosa . Hence , the reproductive system of this one variety must have ...
... crossed with the Nico- tiana glutinosa , always yielded hybrids not so sterile as those which were produced from the four other varieties when crossed with N. glutinosa . Hence , the reproductive system of this one variety must have ...
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adapted admit affinities ALEXANDRE DUMAS allied species America ancient appear beak become bees believe belonging birds breeds cause cells characters climate closely allied color continued crossed crustaceans degree developed difficulty distinct species domestic doubt effects eggs embryo existing extinct extremely facts favorable females fertility flowers formation forms fossil Fritz Müller genera genus geological geological period Glacial period gradations greater number groups of species habits Hence hybrids important individuals inhabitants inherited insects instance instincts intercrossing intermediate intervals kind lamellæ larvæ less living male mammals manner marsupials migration modified descendants natural selection naturalists nearly nest oceanic islands offspring organs paleozoic parent peculiar perfect pigeons pistil pollen present principle probably produced quadrupeds ranked remarked resemblance rudimentary seeds Silurian SIR WALTER SCOTT slight South America stamens sterility structure successive suppose tend theory tion trees variability variations varieties vary whole widely different wings young