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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1 페이지
... seen in the latter chapters of this volume , seemed to throw some light on the origin of species - that mystery of myste- ries , as it has been called by one of our greatest philo- sophers . On my return home , it occurred to me , in ...
... seen in the latter chapters of this volume , seemed to throw some light on the origin of species - that mystery of myste- ries , as it has been called by one of our greatest philo- sophers . On my return home , it occurred to me , in ...
12 페이지
... seen , and will hereafter be briefly discussed . I will here only allude to what may be called corre- lated variation . Important changes in the embryo or larva will probably entail changes in the mature animal . In monstrosities , the ...
... seen , and will hereafter be briefly discussed . I will here only allude to what may be called corre- lated variation . Important changes in the embryo or larva will probably entail changes in the mature animal . In monstrosities , the ...
18 페이지
... 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 struc- tural difference between the domestic races of the same species , we are soon ...
... 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 struc- tural difference between the domestic races of the same species , we are soon ...
38 페이지
... seen , as I am informed by him , any native dog in Spain like our pointer . By a similar process of selection , and by careful training , the whole body of English racehorses have come to surpass in fleetness and size the parent Arab ...
... seen , as I am informed by him , any native dog in Spain like our pointer . By a similar process of selection , and by careful training , the whole body of English racehorses have come to surpass in fleetness and size the parent Arab ...
39 페이지
... seen great surprise expressed in horticultural works at the wonderful skill of gardeners , in having produced such splendid results from such poor materials ; but the art has been simple , and , as far as the final result is concerned ...
... seen great surprise expressed in horticultural works at the wonderful skill of gardeners , in having produced such splendid results from such poor materials ; but the art has been simple , and , as far as the final result is concerned ...
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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