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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13 페이지
... give them to show that I have not been hasty in coming to a decision . My work is now nearly finished ; but as it will take me two or three more years to complete it , and as my health is far from strong , I have been urged to publish ...
... give them to show that I have not been hasty in coming to a decision . My work is now nearly finished ; but as it will take me two or three more years to complete it , and as my health is far from strong , I have been urged to publish ...
14 페이지
... give references and authori- ties for my several statements : and I must trust to the reader reposing some confidence in my accuracy . No doubt errors will have crept in , though I hope I have always been cautious in trusting to good ...
... give references and authori- ties for my several statements : and I must trust to the reader reposing some confidence in my accuracy . No doubt errors will have crept in , though I hope I have always been cautious in trusting to good ...
16 페이지
... give a brief recapitulation of the whole work , and a few concluding remarks . No one ought to feel surprise at much remaining as yet unexplained in regard to the origin of species and varieties , if he make due allowance for our ...
... give a brief recapitulation of the whole work , and a few concluding remarks . No one ought to feel surprise at much remaining as yet unexplained in regard to the origin of species and varieties , if he make due allowance for our ...
20 페이지
... give numerous instances ) , yet having their reproductive system so seriously affected by unperceived causes as to fail in acting , we need not be surprised at this system , when it does act under confinement , acting not quite 要 ...
... give numerous instances ) , yet having their reproductive system so seriously affected by unperceived causes as to fail in acting , we need not be surprised at this system , when it does act under confinement , acting not quite 要 ...
26 페이지
... give , we have no right to expect often to meet with generic differences in our domesticated productions . When we attempt to estimate the amount of structural difference between the domestic races of the same species , we are soon ...
... give , we have no right to expect often to meet with generic differences in our domesticated productions . When we attempt to estimate the amount of structural difference between the domestic races of the same species , we are soon ...
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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