The Origin of Species by Means of Natural Selection: Or, The Preservation of Favoured Races in the Struggle for LifePenguin Books, 1982 - 477페이지 |
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209 페이지
... intermediate zone . The intermediate variety , consequently , will exist in lesser numbers from inhabiting a narrow and lesser area ; and practically , as far as I can make out , this rule holds good with varieties in a state of nature ...
... intermediate zone . The intermediate variety , consequently , will exist in lesser numbers from inhabiting a narrow and lesser area ; and practically , as far as I can make out , this rule holds good with varieties in a state of nature ...
211 페이지
... intermediate varieties between the several representative species and their common parent , must formerly have ... intermediate varieties will , it is probable , at first have been formed in the intermediate zones , but they will ...
... intermediate varieties between the several representative species and their common parent , must formerly have ... intermediate varieties will , it is probable , at first have been formed in the intermediate zones , but they will ...
292 페이지
... intermediate varieties , which have formerly existed on the earth , be truly enormous . Why then is not every geological forma- tion and every stratum full of such intermediate links ? Geology assuredly does not reveal any such finely ...
... intermediate varieties , which have formerly existed on the earth , be truly enormous . Why then is not every geological forma- tion and every stratum full of such intermediate links ? Geology assuredly does not reveal any such finely ...
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accumulated adapted affinities allied species America ancient animals appear become bees believe birds breeds cause cells chapter characters cirripedes climate closely allied colour continuous crossed crustaceans Darwin degree developed difficulty distinct species domestic doubt eggs embryo Europe existence exterminated extinct extremely facts favourable fertility flowers formation forms fossil genera genus geological geological period Glacial period gradations greater number groups of species habits Hence hermaphrodites hybrids important individuals inhabitants inherited insects instance instincts intercrossing intermediate larvae less living male mammals manner Marsupials migration modification modified descendants natural selection naturalists nearly nest offspring organisation organs Origin Origin of Species palaeozoic perfect pigeons pistil plants pollen present principle probably produced progenitor quadrupeds ranked remarked reproductive resemblance rudimentary seeds seems sexual selection Silurian slight South America sterility structure struggle successive supposed tend theory tion trees variability variations varieties vary whole widely wings