The Origin of Species by Means of Natural Selection: Or, The Preservation of Favoured Races in the Struggle for LifeJ. Murray, 1920 - 432페이지 |
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xxi 페이지
... amount of modification which living beings have undergone during geological time is but very small in relation to the whole series of changes which they have suffered . " In December , 1859 , Dr. Hooker published his ' Introduction to ...
... amount of modification which living beings have undergone during geological time is but very small in relation to the whole series of changes which they have suffered . " In December , 1859 , Dr. Hooker published his ' Introduction to ...
3 페이지
... amount of hereditary modification is at least pos- sible ; and , what is equally or more important , we shall see how great is the power of man in accumulating by his Selection succes- sive slight variations . I will then pass on to the ...
... amount of hereditary modification is at least pos- sible ; and , what is equally or more important , we shall see how great is the power of man in accumulating by his Selection succes- sive slight variations . I will then pass on to the ...
5 페이지
... amount of variation ; and that , when the organisation has once begun to vary , it generally continues varying for many generations . No case is on record of a variable organism ceasing to vary under cultivation . Our oldest cultivated ...
... amount of variation ; and that , when the organisation has once begun to vary , it generally continues varying for many generations . No case is on record of a variable organism ceasing to vary under cultivation . Our oldest cultivated ...
6 페이지
... amount of food , colour from the nature of the food , thickness of the skin and hair from climate , etc. Each of the endless variations which we see in the plumage of our fowls must have had some efficient cause ; and if the same cause ...
... amount of food , colour from the nature of the food , thickness of the skin and hair from climate , etc. Each of the endless variations which we see in the plumage of our fowls must have had some efficient cause ; and if the same cause ...
12 페이지
... amount of difference in our domesticated races . In attempting to estimate the amount of structural difference between allied domestic races , we are soon involved in doubt , from not knowing whether they are descended from one or ...
... amount of difference in our domesticated races . In attempting to estimate the amount of structural difference between allied domestic races , we are soon involved in doubt , from not knowing whether they are descended from one or ...
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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 fact 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 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