The Origin of Species by Means of Natural Selection,: Or the Preservation of Favoured Races in the Struggle for LifeJohn Murray, Albemarle Street., 1891 - 432페이지 |
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91개의 결과 중 1 - 5개
v 페이지
... VARIATION UNDER DOMESTICATION . Causes of Variability - Effects of Habit and the use or disuse of Parts- Correlated Variation - Inheritance - Character of Domestic Varieties- Difficulty of distinguishing between Varieties and Species ...
... VARIATION UNDER DOMESTICATION . Causes of Variability - Effects of Habit and the use or disuse of Parts- Correlated Variation - Inheritance - Character of Domestic Varieties- Difficulty of distinguishing between Varieties and Species ...
ix 페이지
... variations not supervening at any early age , and being inherited at a corresponding age - RUDIMENTARY ORGANS ; their origin explained - Summary Page 340 CHAPTER XV . RECAPITULATION AND CONCLUSION . .. Recapitulation of the objections ...
... variations not supervening at any early age , and being inherited at a corresponding age - RUDIMENTARY ORGANS ; their origin explained - Summary Page 340 CHAPTER XV . RECAPITULATION AND CONCLUSION . .. Recapitulation of the objections ...
3 페이지
... variation under domestication , afforded the best and safest clue . I may venture to express my conviction of the high ... variations . I will then pass on to the variability of species in a state of nature ; but I shall , unfortunately ...
... variation under domestication , afforded the best and safest clue . I may venture to express my conviction of the high ... variations . I will then pass on to the variability of species in a state of nature ; but I shall , unfortunately ...
5 페이지
... VARIATION UNDER DOMESTICATION . Causes of variability - Effects of habit and the use or disuse of parts - Corre- lated variation - Inheritance - Character of domestic varieties - Difficulty of distinguishing between varieties and ...
... VARIATION UNDER DOMESTICATION . Causes of variability - Effects of habit and the use or disuse of parts - Corre- lated variation - Inheritance - Character of domestic varieties - Difficulty of distinguishing between varieties and ...
6 페이지
... variations sometimes arise under , as far as we can judge , dissimilar conditions ; and , on the other hand , dissimilar variations arise under conditions which appear to be nearly uniform . The effects on the offspring are either ...
... variations sometimes arise under , as far as we can judge , dissimilar conditions ; and , on the other hand , dissimilar variations arise under conditions which appear to be nearly uniform . The effects on the offspring are either ...
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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 facts 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 occur 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