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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xviii 페이지
... Cause . " If we interpret these sentences given in the same Address , one by the other , it appears that this eminent philosopher felt in 1858 his confidence shaken that the Apteryx and the Red Grouse first appeared in their respective ...
... Cause . " If we interpret these sentences given in the same Address , one by the other , it appears that this eminent philosopher felt in 1858 his confidence shaken that the Apteryx and the Red Grouse first appeared in their respective ...
2 페이지
... cause of variation . In one limited sense , as we shall hereafter see , this may be true ; but it is preposterous to attribute to mere external conditions , the structure , for instance , of the woodpecker , with its feet , tail , beak ...
... cause of variation . In one limited sense , as we shall hereafter see , this may be true ; but it is preposterous to attribute to mere external conditions , the structure , for instance , of the woodpecker , with its feet , tail , beak ...
4 페이지
... of that 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 .
... of that 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
... Causes of variability - Effects of habit and the use or disuse of parts - Corre- lated variation - Inheritance - Character ... cause any great amount of variation ; and that , when the organisation has once begun to vary , it generally ...
... Causes of variability - Effects of habit and the use or disuse of parts - Corre- lated variation - Inheritance - Character ... cause any great amount of variation ; and that , when the organisation has once begun to vary , it generally ...
6 페이지
... cause were to act uniformly during a long series of generations on many individuals , all probably would be modified ... causing coughs or colds , rheu- matism , or inflammation of various organs . With respect to what I have called the ...
... cause were to act uniformly during a long series of generations on many individuals , all probably would be modified ... causing coughs or colds , rheu- matism , or inflammation of various organs . With respect to what I have called the ...
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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