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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... namely , flotation , may be converted into one for a widely different purpose , namely , respiration 230 [ CHAP . VI . MODES OF TRANSITION .
... namely , flotation , may be converted into one for a widely different purpose , namely , respiration 230 [ CHAP . VI . MODES OF TRANSITION .
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... namely the distinctness of spe- cific forms , and their not being blended together by in- numerable transitional links , is a very obvious difficulty . I assigned reasons why such links do not commonly oc- cur at the present day under ...
... namely the distinctness of spe- cific forms , and their not being blended together by in- numerable transitional links , is a very obvious difficulty . I assigned reasons why such links do not commonly oc- cur at the present day under ...
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... namely , to the belief that all animals and plants are descended from some one prototype . But analogy may be a deceitful . guide . Nevertheless all living things have much in common , in their chemical composition , their cellular ...
... namely , to the belief that all animals and plants are descended from some one prototype . But analogy may be a deceitful . guide . Nevertheless all living things have much in common , in their chemical composition , their cellular ...
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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