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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88개의 결과 중 1 - 5개
vi 페이지
... individuals - Complex relations of all animals and plants throughout nature - Struggle for life most severe between individuals and varieties of the same species ; often severe be- tween species of the same genus - The relation of ...
... individuals - Complex relations of all animals and plants throughout nature - Struggle for life most severe between individuals and varieties of the same species ; often severe be- tween species of the same genus - The relation of ...
7 페이지
... individuals of the same variety or sub - variety of our older cultivated plants and ani- mals , one of the first points which strikes us is , that they generally differ from each other more than do the individuals of any one species or ...
... individuals of the same variety or sub - variety of our older cultivated plants and ani- mals , one of the first points which strikes us is , that they generally differ from each other more than do the individuals of any one species or ...
8 페이지
... individuals exposed to certain conditions during several generations are modi- fied in the same manner . It is extremely difficult to come to any conclusion in regard to the extent of the changes which have been thus definitely induced ...
... individuals exposed to certain conditions during several generations are modi- fied in the same manner . It is extremely difficult to come to any conclusion in regard to the extent of the changes which have been thus definitely induced ...
9 페이지
... individuals of the same species , and which cannot be accounted for by inheritance from either parent or from some more remote ancestor . Even strongly - marked dif- ferences occasionally appear in the young of the same litter , and in ...
... individuals of the same species , and which cannot be accounted for by inheritance from either parent or from some more remote ancestor . Even strongly - marked dif- ferences occasionally appear in the young of the same litter , and in ...
13 페이지
... individuals escape : Professor Wyman has recently communicated to me a good illustration of this fact ; on asking some farmers in Florida how it was that all their pigs were black , they informed him that the pigs ate the paint - root ...
... individuals escape : Professor Wyman has recently communicated to me a good illustration of this fact ; on asking some farmers in Florida how it was that all their pigs were black , they informed him that the pigs ate the paint - root ...
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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