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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... genera in each country vary more frequently than the species of the smaller genera Many of the species of the larger genera resemble varieties in being very closely , but un- equally , related to each other , and in having restricted ...
... genera in each country vary more frequently than the species of the smaller genera Many of the species of the larger genera resemble varieties in being very closely , but un- equally , related to each other , and in having restricted ...
6 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 . Further- more , 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 . Further- more , I am convinced that Natural Selection ...
46 페이지
... genera . Isidore 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 characteristics , Eclipse was far fleeter ...
... genera . Isidore 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 characteristics , Eclipse was far fleeter ...
48 페이지
... genera - Many of the species of the larger genera resemble varieties in being very closely , but un- equally , 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 un- equally , related to each other , and in having restricted ranges . BEFORE applying the principles arrived at in the last chapter to ...
51 페이지
... genera of insects , several genera of Brachiopod shells , and the Ruff ( Machetes pugnax ) amongst birds . In most polymorphic genera some of the species have fixed and definite characters . Genera which are polymorphic in one country ...
... genera of insects , several genera of Brachiopod shells , and the Ruff ( Machetes pugnax ) amongst birds . In most polymorphic genera some of the species have fixed and definite characters . Genera which are polymorphic in one country ...
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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