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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xxiii 페이지
... suppose that each species of animal and plant , or each great type of organisation , was formed and placed upon the surface of the globe at long intervals by a distinct act of creative power ; and it is well to recollect that such an ...
... suppose that each species of animal and plant , or each great type of organisation , was formed and placed upon the surface of the globe at long intervals by a distinct act of creative power ; and it is well to recollect that such an ...
28 페이지
... hypothesis so far as to suppose that species , aboriginally as distinct as carriers , tumblers , pouters , and fantails now are , should yield offspring perfectly fertile inter se , seems to me 28 : CHAP . L DOMESTIC PIGEONS .
... hypothesis so far as to suppose that species , aboriginally as distinct as carriers , tumblers , pouters , and fantails now are , should yield offspring perfectly fertile inter se , seems to me 28 : CHAP . L DOMESTIC PIGEONS .
33 페이지
... suppose that all the breeds were suddenly produced as perfect and as useful as we now see them ; indeed , in many cases , we know that this has not been their history . The key is man's power of accumulative selection : nature gives ...
... suppose that all the breeds were suddenly produced as perfect and as useful as we now see them ; indeed , in many cases , we know that this has not been their history . The key is man's power of accumulative selection : nature gives ...
54 페이지
... 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 a form should be ranked as a species or a variety ...
... 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 a form should be ranked as a species or a variety ...
103 페이지
... suppose that the fleetest prey , a deer for instance , had from any change in the country increased in numbers , or that other prey had decreased in numbers , during that season of the year when the wolf was hardest pressed for food ...
... suppose that the fleetest prey , a deer for instance , had from any change in the country increased in numbers , or that other prey had decreased in numbers , during that season of the year when the wolf was hardest pressed for food ...
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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