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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... perfect as an eagle's eye might thus be formed , although in this case he does not know the transitional states . It has been objected that in order to modify the eye and still preserve it as a perfect instrument , many changes would ...
... perfect as an eagle's eye might thus be formed , although in this case he does not know the transitional states . It has been objected that in order to modify the eye and still preserve it as a perfect instrument , many changes would ...
255 페이지
... perfect as , or slightly more perfect than , the other inhabitants of the same country with which it comes into competition . And we see that this is the standard of perfection attained under nature . The en- demic productions of New ...
... perfect as , or slightly more perfect than , the other inhabitants of the same country with which it comes into competition . And we see that this is the standard of perfection attained under nature . The en- demic productions of New ...
319 페이지
... perfect ( winged ) repro- ductive form . In most insects the pupal stage is passed in perfect repose . The chrysalis is the pupal state of butterflies . RADICLE . The minute root of an embryo plant . RAMUS . - One half of the lower jaw ...
... perfect ( winged ) repro- ductive form . In most insects the pupal stage is passed in perfect repose . The chrysalis is the pupal state of butterflies . RADICLE . The minute root of an embryo plant . RAMUS . - One half of the lower jaw ...
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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