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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15 페이지
... amount of hereditary modification is at least possible ; and , what is equally or more important , we shall see how great is the power of man in accumulating by his Selection successive slight variations . I will then pass on to the ...
... amount of hereditary modification is at least possible ; and , what is equally or more important , we shall see how great is the power of man in accumulating by his Selection successive slight variations . I will then pass on to the ...
19 페이지
... amount of variation ; and that when the organisation has once begun to vary , it generally continues to vary for many generations . No case is on record of a variable being ceasing to be variable under cultivation . Our oldeşt ...
... amount of variation ; and that when the organisation has once begun to vary , it generally continues to vary for many generations . No case is on record of a variable being ceasing to be variable under cultivation . Our oldeşt ...
22 페이지
... amount of change may , I think , be attributed to the direct action of the conditions of life - as , in some cases , increased size from amount of food , colour from particular kinds of food , and perhaps the thickness of fur from ...
... amount of change may , I think , be attributed to the direct action of the conditions of life - as , in some cases , increased size from amount of food , colour from particular kinds of food , and perhaps the thickness of fur from ...
26 페이지
... amount of structural difference between the domestic races of the same species , we are soon involved in doubt , from not knowing whether they have descended from one or several parent - species .. This point , if it could be cleared up ...
... amount of structural difference between the domestic races of the same species , we are soon involved in doubt , from not knowing whether they have descended from one or several parent - species .. This point , if it could be cleared up ...
27 페이지
... amount of difference between the several breeds of the dog has been produced under domestication ; I believe that some small part of the difference is due to their having descended from distinct species . ] In the case of some other ...
... amount of difference between the several breeds of the dog has been produced under domestication ; I believe that some small part of the difference is due to their having descended from distinct species . ] In the case of some other ...
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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