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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9 페이지
... Hence if man goes on selecting , and thus augmenting , any peculiarity , he will almost certainly modify unintentionally other parts of the structure , owing to the mysterious laws of correlation . 99 The results of the various ...
... Hence if man goes on selecting , and thus augmenting , any peculiarity , he will almost certainly modify unintentionally other parts of the structure , owing to the mysterious laws of correlation . 99 The results of the various ...
11 페이지
... Hence it has been argued that no deductions can be drawn from domestic races to species in a state of nature . I have in vain endeavoured to discover on what decisive facts the above statement has so often and so boldly been made ...
... Hence it has been argued that no deductions can be drawn from domestic races to species in a state of nature . I have in vain endeavoured to discover on what decisive facts the above statement has so often and so boldly been made ...
17 페이지
... Hence the supposed aboriginal stocks must either still exist in the countries where they were originally domesticated , and yet be unknown to ornithologists ; and this , considering their size , habits , and remark- able characters ...
... Hence the supposed aboriginal stocks must either still exist in the countries where they were originally domesticated , and yet be unknown to ornithologists ; and this , considering their size , habits , and remark- able characters ...
18 페이지
... Hence it must be assumed not only that half - civilised man succeeded in thoroughly domesticating several species , but that he intentionally or by chance picked out extraordinarily abnormal species ; and further , that these very ...
... Hence it must be assumed not only that half - civilised man succeeded in thoroughly domesticating several species , but that he intentionally or by chance picked out extraordinarily abnormal species ; and further , that these very ...
28 페이지
... goose has not given rise to any marked varieties ; hence the Tou- louse and the common breed , which differ only in colour , that mot fleeting of characters , have lately been exhibited as distinct 28 CHAP . 1 Unconscious Selection .
... goose has not given rise to any marked varieties ; hence the Tou- louse and the common breed , which differ only in colour , that mot fleeting of characters , have lately been exhibited as distinct 28 CHAP . 1 Unconscious Selection .
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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