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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... distinct at our poultry - shows . These views appear to explain what has sometimes been noticed - namely , that we know hardly anything about the origin or history of any of our domestic breeds . But , in fact , a breed , like a dialect ...
... distinct at our poultry - shows . These views appear to explain what has sometimes been noticed - namely , that we know hardly anything about the origin or history of any of our domestic breeds . But , in fact , a breed , like a dialect ...
122 페이지
... distinct variety having a prepotent effect over the flower's own pollen ; and that this is part of the gen- eral law of good being derived from the intercrossing of distinct individuals of the same species . When distinct species are ...
... distinct variety having a prepotent effect over the flower's own pollen ; and that this is part of the gen- eral law of good being derived from the intercrossing of distinct individuals of the same species . When distinct species are ...
230 페이지
... distinct means , by spirally twin- ing , by clasping a support with their sensitive tendrils , and by the emission of aërial rootlets ; these three means are usually found in distinct groups , but some few species exhibit two of the ...
... distinct means , by spirally twin- ing , by clasping a support with their sensitive tendrils , and by the emission of aërial rootlets ; these three means are usually found in distinct groups , but some few species exhibit two of the ...
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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