The Origin of Species by Means of Natural Selection: Or, The Preservation of Favoured Races in the Struggle for LifeJ. Murray, 1920 - 432페이지 |
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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 mysteries , as it has been called by one of our greatest philosophers . On my return home , it occurred to me , in 1837 ...
... seen in the latter chapters of this volume , seemed to throw some light on the origin of species - that mystery of mysteries , as it has been called by one of our greatest philosophers . On my return home , it occurred to me , in 1837 ...
8 페이지
... seen , and will hereafter be briefly discussed . I will here only allude to what may be called correlated 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 correlated variation . Important changes in the embryo or larva will probably entail changes in the mature animal . In monstrosities , the ...
12 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 structural difference between allied domestic races , we are soon involved in doubt ...
... 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 domestic races , we are soon involved in doubt ...
24 페이지
... seen , as I am informed by him , any native dog in Spain like our pointer . By a simple process of selection , and by careful training , English racehorses have come to surpass in fleetness and size the parent Arabs , so that the latter ...
... seen , as I am informed by him , any native dog in Spain like our pointer . By a simple process of selection , and by careful training , English racehorses have come to surpass in fleetness and size the parent Arabs , so that the latter ...
25 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 con- cerned ...
... 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 con- cerned ...
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accumulated adapted admit affinities allied species America analogous ancient appear beak become bees believe belonging birds breeds cause cells characters climate closely allied colour continued crossed crustaceans degree developed difficulty distinct species domestic animals doubt effects eggs embryo existing extinct extremely fact favourable female fertilised fertility flowers formation formerly forms fossil Fritz Müller genera genus geological geological period Glacial period gradations greater number habits Hence hybrids important increase 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 oceanic islands offspring organisation organs parent peculiar perfect pigeon pistil pollen present preserved principle probably produced quadrupeds ranked reciprocal crosses remarked resemblance rudimentary seeds sexual selection Silurian slight South America stamens sterility structure successive supposed tend theory tion variability variations varieties vary whilst whole wings young