On the Origin of Species by Means of Natural Selection: Or The Preservation of Favoured Races in the Struggle for LifeHumphrey Milford, Oxford University Press, 1923 - 454페이지 |
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44 페이지
... analogy leads the observer to suppose either that they do now somewhere exist , or may formerly have existed ; and here a wide door for the entry of doubt and conjecture is opened . Hence , in determining whether form should be ranked ...
... analogy leads the observer to suppose either that they do now somewhere exist , or may formerly have existed ; and here a wide door for the entry of doubt and conjecture is opened . Hence , in determining whether form should be ranked ...
47 페이지
... analogy , and his difficulties rise to a climax . Certainly no clear line of demarcation has as yet been drawn between species and sub - species - that is , the forms which in the opinion of some naturalists ا come very near to , but do ...
... analogy , and his difficulties rise to a climax . Certainly no clear line of demarcation has as yet been drawn between species and sub - species - that is , the forms which in the opinion of some naturalists ا come very near to , but do ...
52 페이지
... analogy whether or not the amount suffices to raise one or both to the rank of species . Hence the amount of difference is one very important criterion in settling whether two forms should be ranked as species or varieties . Now Fries ...
... analogy whether or not the amount suffices to raise one or both to the rank of species . Hence the amount of difference is one very important criterion in settling whether two forms should be ranked as species or varieties . Now Fries ...
54 페이지
... analogy with varieties . And we can clearly understand these analogies , if species have once existed as varieties , and have thus originated : whereas , these analogies are utterly in- explicable if each species has been independently ...
... analogy with varieties . And we can clearly understand these analogies , if species have once existed as varieties , and have thus originated : whereas , these analogies are utterly in- explicable if each species has been independently ...
82 페이지
... analogous cases under nature , for instance , the tuft of hair on the breast of the turkey - cock , which can hardly be either useful or ornamental to this bird ; — indeed , had the tuft appeared under domestication , it would have been ...
... analogous cases under nature , for instance , the tuft of hair on the breast of the turkey - cock , which can hardly be either useful or ornamental to this bird ; — indeed , had the tuft appeared under domestication , it would have been ...
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accumulated adapted affinities allied species America amount analogous ancient appear Archipelago become bees believe birds breeds cause cells characters cirripedes climate closely allied colour common parent continuous crossed crustaceans degree difficulty distinct species divergence doubt embryo endemic Europe existing exterminated extinct extremely facts favourable fertility flowers formations forms fossil Gärtner genera genus geological geological period Glacial period gradations greater number groups of species habits Hence hermaphrodites hybrids hybrids produced important individuals inhabitants inherited insects instance instincts intercrossing land larvæ less living male mammals manner Marsupials migration modification modified descendants natural selection naturalists nearly nest oceanic islands offspring organisation perfect pigeons pistil plants pollen present principle probably produced progenitor ranked reciprocal crosses remarked resemble rock-pigeon rudimentary organs seeds sexual selection Silurian slight South America sterility structure struggle successive suppose swimbladder tend theory tion trees variability variation vary whole widely