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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54 페이지
... never have been ex- pected that the branching of the main nerves close to the great central ganglion of an insect would have been variable in the same species ; it might have been thought that changes of this nature could have been ...
... never have been ex- pected that the branching of the main nerves close to the great central ganglion of an insect would have been variable in the same species ; it might have been thought that changes of this nature could have been ...
328 페이지
... never become " broody , " that is , never wish to sit on their eggs . Familiarity alone prevents our seeing how largely and how perma- nently the minds of our domestic animals have been modified . It is scarcely possible to doubt that ...
... never become " broody , " that is , never wish to sit on their eggs . Familiarity alone prevents our seeing how largely and how perma- nently the minds of our domestic animals have been modified . It is scarcely possible to doubt that ...
338 페이지
... never been observed in the nests of F. sanguinea . The slaves are black and not above half the size of their red masters , so that the contrast in their appearance is great . When the nest is slightly disturbed , the slaves occasionally ...
... never been observed in the nests of F. sanguinea . The slaves are black and not above half the size of their red masters , so that the contrast in their appearance is great . When the nest is slightly disturbed , the slaves occasionally ...
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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