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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52개의 결과 중 1 - 5개
v 페이지
... 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 - Origin of domestic varieties from one or ...
... 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 - Origin of domestic varieties from one or ...
3 페이지
... variability of species in a state of nature ; but I shall , unfortunately , be com- pelled to treat this subject far too briefly , as it can be treated properly only by giving long catalogues of facts . We shall , how- ever , be enabled ...
... variability of species in a state of nature ; but I shall , unfortunately , be com- pelled to treat this subject far too briefly , as it can be treated properly only by giving long catalogues of facts . We shall , how- ever , be enabled ...
4 페이지
... species . Furthermore , I am convinced that Natural Selection has been the most important , but not the exclusive , means of modification . CHAPTER I. VARIATION UNDER DOMESTICATION . Causes of variability -. 4 INTRODUCTION .
... species . Furthermore , I am convinced that Natural Selection has been the most important , but not the exclusive , means of modification . CHAPTER I. VARIATION UNDER DOMESTICATION . Causes of variability -. 4 INTRODUCTION .
5 페이지
... 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 species - Origin of domestic varieties from one ...
... 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 species - Origin of domestic varieties from one ...
6 페이지
... variability is a much more common result of changed conditions than definite variability , and has probably played a more important part in the formation of our domestic races . We see indefinite variability in the endless slight ...
... variability is a much more common result of changed conditions than definite variability , and has probably played a more important part in the formation of our domestic races . We see indefinite variability in the endless slight ...
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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