On the Origin of the Species by Means of Natural Selection: Or, The Preservation of Favoured Races in the Struggle for LifeJohn Murray, 1869 - 596페이지 |
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81개의 결과 중 1 - 5개
xvii 페이지
... occur among the first few and scat- tered inhabitants of the middle regions of Africa , some one would be better fitted than the others to bear the diseases of the country . This race would consequently multiply , while the others would ...
... occur among the first few and scat- tered inhabitants of the middle regions of Africa , some one would be better fitted than the others to bear the diseases of the country . This race would consequently multiply , while the others would ...
1 페이지
... occurred to me , in 1837 , that something might perhaps be made out on this question by patiently accumulating and reflecting on all sorts of facts which could possibly have any bear- ing on it . After five years ' work I allowed myself ...
... occurred to me , in 1837 , that something might perhaps be made out on this question by patiently accumulating and reflecting on all sorts of facts which could possibly have any bear- ing on it . After five years ' work I allowed myself ...
11 페이지
... occur rarely under nature , but far from rarely under culture . As a single bud out of the many thousands produced year after year under uniform conditions on the same tree , has been known suddenly to assume a new character ; and as ...
... occur rarely under nature , but far from rarely under culture . As a single bud out of the many thousands produced year after year under uniform conditions on the same tree , has been known suddenly to assume a new character ; and as ...
27 페이지
... occur together in any other species of the whole family . Now , in every one of the domestic breeds , taking thoroughly well - bred birds , all the above marks , even to the white edging of the outer tail - feathers , sometimes concur ...
... occur together in any other species of the whole family . Now , in every one of the domestic breeds , taking thoroughly well - bred birds , all the above marks , even to the white edging of the outer tail - feathers , sometimes concur ...
49 페이지
... occur which resemble normal structures in widely different animals . Thus pigs have often been born with a sort of proboscis like that of the tapir or elephant . Now , if any wild species of the pig - genus had naturally possessed a pro ...
... occur which resemble normal structures in widely different animals . Thus pigs have often been born with a sort of proboscis like that of the tapir or elephant . Now , if any wild species of the pig - genus had naturally possessed a pro ...
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accumulated adapted affinities allied species America ancient appear Asa Gray become bees believe birds breeds cause cells characters cirripedes climate closely allied colour common continuous crossed crustaceans degree difficulty distinct species divergence domestic doubt Edition eggs embryo existing exterminated extinct extremely facts favourable females fertilised fertility flowers formation forms fossil Fritz Müller Gärtner genera genus geological Glacial period gradations greater number groups of species habits Hence hermaphrodites hybrids important individuals inhabitants inherited insects instance instincts intercrossing intermediate larvæ less living males mammals manner migration modified descendants natural selection naturalists nearly nest occur oceanic islands offspring organisation parent perfect pigeons pistil pollen Post 8vo present principle probably produced progenitor racters ranked reciprocal crosses remarked resemble seeds sexual sexual selection Silurian slight South America stamens sterility structure struggle successive suppose theory tion variability variations varieties vary vols whole widely