On the Origin of Species by Means of Natural Selection: Or The Preservation of Favored Races in the Struggle for Life, 2권D. Appleton, 1888 - 458페이지 |
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... genera - Many of the species of the larger genera resemble varieties in being very closely , but unequally , related to each other , and in having restricted ranges 33-47 .. .. CHAPTER III . STRUGGLE FOR EXISTENCE . - Its bearing on ...
... genera - Many of the species of the larger genera resemble varieties in being very closely , but unequally , related to each other , and in having restricted ranges 33-47 .. .. CHAPTER III . STRUGGLE FOR EXISTENCE . - Its bearing on ...
4 페이지
... genera are lineal descendants of some other and generally extinct species , in the same manner as the acknowledged varieties of any one species are the descendants of that species . Furthermore , I am convinced that Natural Selection ...
... genera are lineal descendants of some other and generally extinct species , in the same manner as the acknowledged varieties of any one species are the descendants of that species . Furthermore , I am convinced that Natural Selection ...
12 페이지
... genera originate under nature , it will be seen that we have no right to expect often to find a generic amount of difference in our domesticated races . In attempting to estimate the amount of structural difference between allied ...
... genera originate under nature , it will be seen that we have no right to expect often to find a generic amount of difference in our domesticated races . In attempting to estimate the amount of structural difference between allied ...
31 페이지
... genera . Isidoro Geoffroy St. Hilaire has proved this in regard to size , and so it is with colour and probably with the length of hair . With respect to fleetness , which depends on many bodily characters , Eclipse was far fleeter ...
... genera . Isidoro Geoffroy St. Hilaire has proved this in regard to size , and so it is with colour and probably with the length of hair . With respect to fleetness , which depends on many bodily characters , Eclipse was far fleeter ...
33 페이지
... genera - Many of the species of the larger genera resemble varieties in being very closely , but unequally , related to each other , and in having restricted ranges . - BEFORE applying the principles arrived at in the last chapter to ...
... genera - Many of the species of the larger genera resemble varieties in being very closely , but unequally , related to each other , and in having restricted ranges . - BEFORE applying the principles arrived at in the last chapter to ...
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adapted admit affinities allied species America analogous ancient appear Asa Gray beak become bees believe belonging birds breeds cause cells characters climate closely allied colour continued crossed crustaceans degree developed difficulty distinct species doubt effects eggs embryo existing extinct extremely facts favourable fertilised fertility flowers formation formerly forms fossil Fritz Müller genera genus geological geological period Glacial period gradations greater number habits Hence hybrids important individuals inhabitants inherited insects instance instincts intercrossing intermediate kind lamellæ larvæ less living male mammals manner Marsupials migration modified descendants natural selection naturalists nearly nest occasionally occur oceanic islands offspring organisation organs parent peculiar perfect pigeon pistil pollen present preserved principle probably produced quadrupeds ranked reciprocal crosses remarked reproductive resemblance rudimentary seeds sexual selection slight South America stamens sterility structure struggle successive supposed tend theory tion variability variations varieties vary whilst whole wings young