On the Origin of Species by Means of Natural Selection: Or, The Preservation of Favoured Races in the Struggle for LifeD. Appleton, 1909 - 430페이지 |
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10 페이지
... islands - Absence of Batrachians and of terrestrial Mam- mals - On the relation of the inhabitants of islands to those of the nearest mainland - On colonisation from the nearest source with subsequent modification - Summary of the last ...
... islands - Absence of Batrachians and of terrestrial Mam- mals - On the relation of the inhabitants of islands to those of the nearest mainland - On colonisation from the nearest source with subsequent modification - Summary of the last ...
53 페이지
... islands of the Galapagos Archipelago , both one with another , and with those from the American mainland , I was much struck how entirely vague and arbitrary is the distinction between species and varieties . On the islets of the little ...
... islands of the Galapagos Archipelago , both one with another , and with those from the American mainland , I was much struck how entirely vague and arbitrary is the distinction between species and varieties . On the islets of the little ...
66 페이지
... islands in a period of less than ten years . Several of the plants , such as the cardoon and a tall thistle , now most numerous over the wide plains of La Plata , clothing square leagues of surface almost to the exclusion of all other ...
... islands in a period of less than ten years . Several of the plants , such as the cardoon and a tall thistle , now most numerous over the wide plains of La Plata , clothing square leagues of surface almost to the exclusion of all other ...
80 페이지
... island , or of a country partly surrounded by barriers , into which new and better adapted forms could not freely enter , we should then have places in the economy of nature which would assuredly be better filled up , if some of the ...
... island , or of a country partly surrounded by barriers , into which new and better adapted forms could not freely enter , we should then have places in the economy of nature which would assuredly be better filled up , if some of the ...
99 페이지
... island , although the total number of the species inhabiting it , will be found to be small , as we shall see in our chapter on Geographical Distribution ; yet of these species a very large proportion are endemic , - that is , have been ...
... island , although the total number of the species inhabiting it , will be found to be small , as we shall see in our chapter on Geographical Distribution ; yet of these species a very large proportion are endemic , - that is , have been ...
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accumulated adapted affinities allied species America analogous ancient animals appear archipelago become bees believe birds breeds cause cells characters cirripedes climate closely allied colour continuous crossed crustaceans degree difficulty distinct species divergence domestic doubt embryo endemic existing exterminated extinct extremely facts favourable fertilised fertility flowers formations forms fossil Gärtner genera genus geological geological period Glacial period gradations greater number groups of species habits Hence hybrids hybrids produced important increase individuals inhabitants inherited insects instance instincts intercrossing intermediate larvæ laws less living males mammals manner migration modification modified descendants natural selection naturalists nearly nest occasionally offspring organic organisation origin of species perfect pigeons plants pollen present principle probably produced progenitor ranked reciprocal crosses remarked resemble rock-pigeon rudimentary seeds sexual sexual selection Silurian slight sometimes South America sterility structure struggle successive supposed swimbladder tend theory variability variations varieties vary whole widely