On the Origin of the Species by Means of Natural Selection: Or, The Preservation of Favoured Races in the Struggle for LifeJohn Murray, 1869 - 596페이지 |
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8 페이지
... slight changes , -such as size from the amount of food , colour from the nature of the food , thickness of the skin and hair from climate , & c . Each of the endless variations which we see in the plumage of our fowls must have had some ...
... slight changes , -such as size from the amount of food , colour from the nature of the food , thickness of the skin and hair from climate , & c . Each of the endless variations which we see in the plumage of our fowls must have had some ...
9 페이지
... slight peculiarities which distinguish the individuals of the same species , and which cannot be accounted for by inheritance from either parent or from some more remote ancestor . Even strongly - marked dif- ferences occasionally ...
... slight peculiarities which distinguish the individuals of the same species , and which cannot be accounted for by inheritance from either parent or from some more remote ancestor . Even strongly - marked dif- ferences occasionally ...
10 페이지
... slight changes in the surrounding conditions . Nothing is more easy than to tame an animal , and few things more difficult than to get it to breed freely under confinement , even when the male and female unite . How many animals there ...
... slight changes in the surrounding conditions . Nothing is more easy than to tame an animal , and few things more difficult than to get it to breed freely under confinement , even when the male and female unite . How many animals there ...
13 페이지
... The whole organisation seems to have become plastic , and tends to depart in a slight degree from that of the parental type . Any variation which is not inherited is unimportant for us CHAP . I. 13 UNDER DOMESTICATION .
... The whole organisation seems to have become plastic , and tends to depart in a slight degree from that of the parental type . Any variation which is not inherited is unimportant for us CHAP . I. 13 UNDER DOMESTICATION .
14 페이지
... slight and those of considerable physiological importance , are endless . Dr. Prosper Lucas's treatise , in two large volumes , is the fullest and the best on this subject . No breeder doubts how strong is the tendency to inheritance ...
... slight and those of considerable physiological importance , are endless . Dr. Prosper Lucas's treatise , in two large volumes , is the fullest and the best on this subject . No breeder doubts how strong is the tendency to inheritance ...
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accumulated adapted affinities allied species America ancient appear Asa Gray become bees believe birds breeds cause cells characters cirripedes climate closely allied colour common continuous crossed crustaceans degree difficulty distinct species divergence domestic doubt Edition eggs embryo existing exterminated extinct extremely facts favourable females fertilised fertility flowers formation forms fossil Fritz Müller Gärtner genera genus geological Glacial period gradations greater number groups of species habits Hence hermaphrodites hybrids important individuals inhabitants inherited insects instance instincts intercrossing intermediate larvæ less living males mammals manner migration modified descendants natural selection naturalists nearly nest occur oceanic islands offspring organisation parent perfect pigeons pistil pollen Post 8vo present principle probably produced progenitor racters ranked reciprocal crosses remarked resemble seeds sexual sexual selection Silurian slight South America stamens sterility structure struggle successive suppose theory tion variability variations varieties vary vols whole widely