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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67개의 결과 중 1 - 5개
xiv 페이지
... tend to progress , in order to account for the existence at the present day of simple productions , he maintains that such forms are now spontaneously generated . * Geoffroy Saint - Hilaire , as is stated in his ' Life , ' written by ...
... tend to progress , in order to account for the existence at the present day of simple productions , he maintains that such forms are now spontaneously generated . * Geoffroy Saint - Hilaire , as is stated in his ' Life , ' written by ...
xv 페이지
... tend to 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 ...
... tend to 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 ...
3 페이지
... tend to propagate its new and modified form . This fundamental subject of Natural Selection will be treated at some length in the fourth chapter ; and we shall then see how Natural Selection almost inevitably causes much Extinction of ...
... tend to propagate its new and modified form . This fundamental subject of Natural Selection will be treated at some length in the fourth chapter ; and we shall then see how Natural Selection almost inevitably causes much Extinction of ...
10 페이지
... tends to reappear in the offspring at a corresponding age , though sometimes earlier . In many cases this could not ... tend to appear in the offspring at the same period at which it first appeared in the parent . I believe this rule to ...
... tends to reappear in the offspring at a corresponding age , though sometimes earlier . In many cases this could not ... tend to appear in the offspring at the same period at which it first appeared in the parent . I believe this rule to ...
27 페이지
... tend , -perhaps more at one period than at another , as the breed rises or falls in fashion , -perhaps more in one district than in another , according to the state of civilisation of the inhabitants , -slowly to add to the ...
... tend , -perhaps more at one period than at another , as the breed rises or falls in fashion , -perhaps more in one district than in another , according to the state of civilisation of the inhabitants , -slowly to add to 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