The Origin of Species by Means of Natural Selection: Or, The Preservation of Favored Races in the Struggle for LifeP.F. Collier & son, 1902 - 356ÆäÀÌÁö |
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17 ÆäÀÌÁö
... find to be a practical difficulty in ascertaining affinities ; second , of another impulse connected with the vital forces , tending , in the course of generations , to modify organic structures in accordance with external circumstances ...
... find to be a practical difficulty in ascertaining affinities ; second , of another impulse connected with the vital forces , tending , in the course of generations , to modify organic structures in accordance with external circumstances ...
19 ÆäÀÌÁö
... find Professor Owen's controversial writings as difficult to understand and to reconcile with each other , as I do . As far as the , mere enunciation of the principle of natural selection is concerned , it is quite immaterial whether or ...
... find Professor Owen's controversial writings as difficult to understand and to reconcile with each other , as I do . As far as the , mere enunciation of the principle of natural selection is concerned , it is quite immaterial whether or ...
36 ÆäÀÌÁö
... find in the domestic duck that the bones of the wing weigh less and the bones of the leg more , in pro- portion to the whole skeleton , than do the same bones in the wild duck ; and this change may be safely attributed to the domestic ...
... find in the domestic duck that the bones of the wing weigh less and the bones of the leg more , in pro- portion to the whole skeleton , than do the same bones in the wild duck ; and this change may be safely attributed to the domestic ...
42 ÆäÀÌÁö
... find a generic amount of difference in our domesticated races . In attempting to estimate the amount of structural difference between allied domestic races , we we are soon involved in doubt , from not knowing whether they are descended ...
... find a generic amount of difference in our domesticated races . In attempting to estimate the amount of structural difference between allied domestic races , we we are soon involved in doubt , from not knowing whether they are descended ...
44 ÆäÀÌÁö
... find in the most ancient times , on the monuments of Egypt , and in the lake - habitations of Switzerland , much diversity in the breeds ; and that some of these ancient breeds closely resemble , or are identical with , those still ...
... find in the most ancient times , on the monuments of Egypt , and in the lake - habitations of Switzerland , much diversity in the breeds ; and that some of these ancient breeds closely resemble , or are identical with , those still ...
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adapted admit affinities allied species America analogous ancient animals appear beak become bees believe belonging birds breeds cause cells characters climate closely allied color common continent crossed crustaceans degree developed difficulty distinct species domestic doubt eggs embryo existing extinct extremely facts favorable fertility flowers formation forms fossil Fritz Müller genera genus geological Glacial period gradations greater number groups of species habits Hence hybrids important individuals inhabitants inherited insects instance instincts intercrossing intermediate kind lamell©¡ larv©¡ less living male mammals manner marsupial migration modification modified descendants natural selection naturalists nearly nest offspring organs ORIGIN OF SPECIES paleozoic parent peculiar perfect pigeon pistil plants pollen present principle probably produced progenitor quadrupeds ranked reciprocal crosses remarked resemblance rudimentary seeds sexual selection Silurian slight South America stamens sterility structure successive supposed swimbladder theory tion trees variability variations varieties vary whole wings young