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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Charles Darwin. Geometrical Ratio of Increase . A struggle for existence inevitably follows from the high rate at which all organic beings tend to increase . Every being , which during its natural lifetime produces several eggs or seeds ...
Charles Darwin. Geometrical Ratio of Increase . A struggle for existence inevitably follows from the high rate at which all organic beings tend to increase . Every being , which during its natural lifetime produces several eggs or seeds ...
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... increase , the result of which never fails to be surprising , simply explains their ex- traordinarily rapid increase and wide diffusion in their new homes . In a state of nature almost every full - grown plant annually produces seed ...
... increase , the result of which never fails to be surprising , simply explains their ex- traordinarily rapid increase and wide diffusion in their new homes . In a state of nature almost every full - grown plant annually produces seed ...
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... increase in number . But the real importance of a large number of eggs or seeds is to make up for much destruction at some period of life ; and this period in ... Increase . The causes which 82 GEOMETRICAL RATIO OF INCREASE . [ CHAP . IIL.
... increase in number . But the real importance of a large number of eggs or seeds is to make up for much destruction at some period of life ; and this period in ... Increase . The causes which 82 GEOMETRICAL RATIO OF INCREASE . [ CHAP . IIL.
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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