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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iv 페이지
... AMERICA . A MONOGRAPH OF THE CIRRIPEDIA . With Numerous Illustrations . 2 vols . 8vo . RAY SOCIETY . HARDWICKE . ON THE MOVEMENTS and HABITS of CLIMBING PLANTS . With Woodcuts . WILLIAMS & NORGATE . FACTS and ARGUMENTS for DARWIN . By ...
... AMERICA . A MONOGRAPH OF THE CIRRIPEDIA . With Numerous Illustrations . 2 vols . 8vo . RAY SOCIETY . HARDWICKE . ON THE MOVEMENTS and HABITS of CLIMBING PLANTS . With Woodcuts . WILLIAMS & NORGATE . FACTS and ARGUMENTS for DARWIN . By ...
xviii 페이지
... America , ' published in 1836 , wrote ( p . 6 ) as follows : - " All species might have been varieties once , and many varieties are gradually becoming species by assuming constant and peculiar characters : " but farther on ( p . 18 ) ...
... America , ' published in 1836 , wrote ( p . 6 ) as follows : - " All species might have been varieties once , and many varieties are gradually becoming species by assuming constant and peculiar characters : " but farther on ( p . 18 ) ...
1 페이지
... America , and in the geological relations of the present to the past inhabitants of that continent . These facts , as will be seen in the latter chapters of this volume , seemed to throw some light on the origin of species - that ...
... America , and in the geological relations of the present to the past inhabitants of that continent . These facts , as will be seen in the latter chapters of this volume , seemed to throw some light on the origin of species - that ...
55 페이지
... America and Europe , which differ very slightly from each other , have been ranked by one eminent naturalist as undoubted species , and by another as varieties , or , as they are often called , as geo- graphical races ! Mr. Wallace , in ...
... America and Europe , which differ very slightly from each other , have been ranked by one eminent naturalist as undoubted species , and by another as varieties , or , as they are often called , as geo- graphical races ! Mr. Wallace , in ...
57 페이지
... America and Europe is ample , will that between Europe and the Azores , or Madeira , or the Canaries , or between the several islets of these small archipelagos , be sufficient ? Mr. B. D. Walsh , a distinguished entomologist of the ...
... America and Europe is ample , will that between Europe and the Azores , or Madeira , or the Canaries , or between the several islets of these small archipelagos , be sufficient ? Mr. B. D. Walsh , a distinguished entomologist of the ...
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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