On the Origin of the Species by Means of Natural Selection: Or, The Preservation of Favoured Races in the Struggle for LifeJohn Murray, 1869 - 596페이지 |
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vi 페이지
... increase Rapid increase of naturalised animals and plants — Nature of the checks to increase — Compe- tition universal - Effects of Climate Protection from the number of individuals - Complex relations of all animals and plants ...
... increase Rapid increase of naturalised animals and plants — Nature of the checks to increase — Compe- tition universal - Effects of Climate Protection from the number of individuals - Complex relations of all animals and plants ...
4 페이지
... increase , will be treated of . This is the doctrine of Malthus , applied to the whole animal and vegetable kingdoms . As many more individuals of each species are born than can possibly survive ; and as , con- sequently , there is a ...
... increase , will be treated of . This is the doctrine of Malthus , applied to the whole animal and vegetable kingdoms . As many more individuals of each species are born than can possibly survive ; and as , con- sequently , there is a ...
35 페이지
... increasing size of the common gooseberry may be quoted . We see an asto- nishing improvement in many florists ' flowers , when the flowers of the present day are compared with drawings made only twenty or thirty years ago . When a race ...
... increasing size of the common gooseberry may be quoted . We see an asto- nishing improvement in many florists ' flowers , when the flowers of the present day are compared with drawings made only twenty or thirty years ago . When a race ...
38 페이지
... increased in weight and in early maturity , compared with the stock formerly kept in this country . By comparing the accounts given in old pigeon treatises of carriers and tumblers with these breeds as now existing in Britain , India ...
... increased in weight and in early maturity , compared with the stock formerly kept in this country . By comparing the accounts given in old pigeon treatises of carriers and tumblers with these breeds as now existing in Britain , India ...
39 페이지
... increased size and beauty which we now see in the varieties of the heartsease , rose , pelar- gonium , dahlia , and other plants , when compared with the older varieties or with their parent - stocks . No one would ever expect to get a ...
... increased size and beauty which we now see in the varieties of the heartsease , rose , pelar- gonium , dahlia , and other plants , when compared with the older varieties or with their parent - stocks . No one would ever expect to get a ...
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accumulated adapted affinities allied species America ancient appear Asa Gray become bees believe birds breeds cause cells characters cirripedes climate closely allied colour common continuous crossed crustaceans degree difficulty distinct species divergence domestic doubt Edition eggs embryo existing exterminated extinct extremely facts favourable females fertilised fertility flowers formation forms fossil Fritz Müller Gärtner genera genus geological Glacial period gradations greater number groups of species habits Hence hermaphrodites hybrids important individuals inhabitants inherited insects instance instincts intercrossing intermediate larvæ less living males mammals manner migration modified descendants natural selection naturalists nearly nest occur oceanic islands offspring organisation parent perfect pigeons pistil pollen Post 8vo present principle probably produced progenitor racters ranked reciprocal crosses remarked resemble seeds sexual sexual selection Silurian slight South America stamens sterility structure struggle successive suppose theory tion variability variations varieties vary vols whole widely