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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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
... the muscles of the ear , from the animals being seldom much alarmed , seems probable . Many laws regulate variation , some few of which can be dimly seen , and will hereafter be briefly discussed . I Variation under Domestication . CHAP .
... the muscles of the ear , from the animals being seldom much alarmed , seems probable . Many laws regulate variation , some few of which can be dimly seen , and will hereafter be briefly discussed . I Variation under Domestication . CHAP .
9 페이지
Or The Preservation of Favored Races in the Struggle for Life Charles Darwin. seen , and will hereafter be briefly discussed . I will here only allu le to what may be called correlated variation . Important changes in the embryo or larva ...
Or The Preservation of Favored Races in the Struggle for Life Charles Darwin. seen , and will hereafter be briefly discussed . I will here only allu le to what may be called correlated variation . Important changes in the embryo or larva ...
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 ...
26 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 , English racehorses have come to surpass in fleetness and size the parent Arabs , so that the ...
... 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 , English racehorses have come to surpass in fleetness and size the parent Arabs , so that the ...
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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