The Origin of Species by Means of Natural Selection, Or, The Preservation of Favored Races in the Struggle for Life, 1-2권D. Appleton, 1917 |
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... crossed by the rock - pigeon : I say within a dozen or twenty generations , for no instance is known of crossed descendants reverting to an ancestor of foreign blood , removed by a greater number of generations . In a breed which has ...
... crossed by the rock - pigeon : I say within a dozen or twenty generations , for no instance is known of crossed descendants reverting to an ancestor of foreign blood , removed by a greater number of generations . In a breed which has ...
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... crossed with the Nicotiana 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 been in ...
... crossed with the Nicotiana 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 been in ...
328 페이지
... crossed maize and verbas- cum , ii . 87 . - , on comparison of hybrids and mongrels , ii . 40 , 41 , 42 . Gaudry , Prof. , on intermediate ge- nera of fossil mammals in Attica , ii . 107 . Geese , fertility when crossed , ii . 9 , 10 ...
... crossed maize and verbas- cum , ii . 87 . - , on comparison of hybrids and mongrels , ii . 40 , 41 , 42 . Gaudry , Prof. , on intermediate ge- nera of fossil mammals in Attica , ii . 107 . Geese , fertility when crossed , ii . 9 , 10 ...
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adapted affinity allied species ancient animals appear Archipelago beak become believe belonging birds breeds Cambrian cause characters climate closely allied colour common continent crossed crustaceans degree developed difficulty distinct species domestic doubt eggs embryo Europe existing extinct extremely facts favourable fertilised fertility fish flowers formation formerly forms fossil Fritz Müller Gärtner genera genus geological geological period Glacial period gradations groups of species habits Hence hybrids hybrids produced important individuals inhabitants inherited insects instance instincts intercrossing intermediate land larvæ less living male mammals manner Marsupials migration modified descendants natural selection naturalists nearly occur oceanic islands offspring organisation parent peculiar perfect pigeon pistil plants pollen present probably produced progenitor quadrupeds ranked reciprocal crosses remarked resemblance seeds Silurian slight South America stage stamens sterility structure successive suppose theory tion variability variations varieties vary whilst whole widely different wings