The Origin of Species by Means of Natural Selection: Or the Preservation of Favored Races in the Struggle for Life |
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Page xix
... produced by the conditions of life are gradual . He argues with much force on general grounds } that species are not immutable productions . But I can- not see how the two supposed " impulses " account in a scientific sense for the ...
... produced by the conditions of life are gradual . He argues with much force on general grounds } that species are not immutable productions . But I can- not see how the two supposed " impulses " account in a scientific sense for the ...
Page 11
... produce young ; whereas carnivorous birds , with the rarest ex- ceptions , hardly ever lay fertile eggs . Many exotic ... produced a single bud with a new and sometimes widely different character from that of the other buds on the same ...
... produce young ; whereas carnivorous birds , with the rarest ex- ceptions , hardly ever lay fertile eggs . Many exotic ... produced a single bud with a new and sometimes widely different character from that of the other buds on the same ...
Page 12
... produced year after year on the same tree under uniform conditions , has been known suddenly to assume a new ... producing nec- tarines , and buds on common roses producing moss- roses - we clearly see that the nature of the conditions ...
... produced year after year on the same tree under uniform conditions , has been known suddenly to assume a new ... producing nec- tarines , and buds on common roses producing moss- roses - we clearly see that the nature of the conditions ...
Page 23
... produced by the crossing of a few aboriginal species ; but by crossing we can only get forms in some degree intermediate between their parents ; and if we account for our several domestic races by this process , we must admit the former ...
... produced by the crossing of a few aboriginal species ; but by crossing we can only get forms in some degree intermediate between their parents ; and if we account for our several domestic races by this process , we must admit the former ...
Page 29
... produced a bird of as beautiful a blue colour , with the white loins , double black wing - bar , and barred and white - edged tail- feathers , as any wild - rock pigeon ! We can under- stand these facts , on the well - known principle ...
... produced a bird of as beautiful a blue colour , with the white loins , double black wing - bar , and barred and white - edged tail- feathers , as any wild - rock pigeon ! We can under- stand these facts , on the well - known principle ...
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Common terms and phrases
adapted affinities allied species America ancient appear Asa Gray beak become bees believe belonging birds breeds cause cells characters climate closely allied colour common continent crossed crustaceans degree developed difficulty distinct species domestic doubt effects eggs embryo existing extinct extremely facts favourable fertilised 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 kind lamellę larvę less living males mammals manner marsupials migration modified descendants natural selection naturalists nearly nest occasionally offspring organisation organs parent peculiar perfect pigeon pistil pollen present principle probably produced progenitor quadrupeds ranked remarked resemblance rudimentary seeds sexual selection Silurian slight South America stamens sterility structure successive supposed swimbladder tend theory tion trees variability variations varieties vary whilst whole wings young