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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91개의 결과 중 1 - 5개
v 페이지
... vary most - Species of the larger genera in each country vary more frequently than the species of the smaller genera -Many of the species of the larger genera resemble varieties in being very closely , but unequally , related to each ...
... vary most - Species of the larger genera in each country vary more frequently than the species of the smaller genera -Many of the species of the larger genera resemble varieties in being very closely , but unequally , related to each ...
vi 페이지
... vary in an analogous manner - Reversions to long - lost characters -Summary . 98 .. CHAPTER VI . DIFFICULTIES OF THE THEORY . Difficulties of the theory of descent with modification - Absence or rarity of transitional varieties ...
... vary in an analogous manner - Reversions to long - lost characters -Summary . 98 .. CHAPTER VI . DIFFICULTIES OF THE THEORY . Difficulties of the theory of descent with modification - Absence or rarity of transitional varieties ...
xv 페이지
... vary in some degree , and , secondly , that agriculturists improve their domesticated animals by selection ; and then , he adds , but what is done in this latter case " by art , seems to be done with equal efficacy , though more slowly ...
... vary in some degree , and , secondly , that agriculturists improve their domesticated animals by selection ; and then , he adds , but what is done in this latter case " by art , seems to be done with equal efficacy , though more slowly ...
3 페이지
... vary however slightly in any manner profitable to itself , under the complex and sometimes varying con- ditions of life , will have a better chance of surviving , and thus be naturally selected . From the strong principle of inheritance ...
... vary however slightly in any manner profitable to itself , under the complex and sometimes varying con- ditions of life , will have a better chance of surviving , and thus be naturally selected . From the strong principle of inheritance ...
5 페이지
... 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 plants , such as wheat , still yield new varieties : our oldest ...
... 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 plants , such as wheat , still yield new varieties : our oldest ...
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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