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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87개의 결과 중 1 - 5개
vi 페이지
... characters more variable than generic : secondary sexual characters variable - Species of the same genus vary in an analogous manner - Reversions to long - lost characters -Summary 98 CHAPTER VI . DIFFICULTIES OF THE THEORY ...
... characters more variable than generic : secondary sexual characters variable - Species of the same genus vary in an analogous manner - Reversions to long - lost characters -Summary 98 CHAPTER VI . DIFFICULTIES OF THE THEORY ...
ix 페이지
... characters - Affinities , general , complex , and radiating - Extinction separates and defines groups - MORPHOLOGY , be- tween members of the same class , between parts of the same individual- EMBRYOLOGY , laws of , explained by ...
... characters - Affinities , general , complex , and radiating - Extinction separates and defines groups - MORPHOLOGY , be- tween members of the same class , between parts of the same individual- EMBRYOLOGY , laws of , explained by ...
xv 페이지
... characters alone . After remarking that negroes and mulattoes enjoy an immunity from certain tropical diseases , he observes , firstly , that all animals tend to vary in some degree , and , secondly , that agriculturists improve their ...
... characters alone . After remarking that negroes and mulattoes enjoy an immunity from certain tropical diseases , he observes , firstly , that all animals tend to vary in some degree , and , secondly , that agriculturists improve their ...
xvi 페이지
... characters ; " but farther on ( p . 18 ) he adds , " except the original types or ancestors of the genus . " " " In ... character , which we find to be a practical difficulty in ascertaining affinities ; second , of another impulse ...
... characters ; " but farther on ( p . 18 ) he adds , " except the original types or ancestors of the genus . " " " In ... character , which we find to be a practical difficulty in ascertaining affinities ; second , of another impulse ...
10 페이지
... characters to its grandfather or grandmother or more remote ancestor ; why a peculiarity is often transmitted from one sex to both sexes , or to one sex alone , more commonly but not exclusively to the like sex . It is a fact of some ...
... characters to its grandfather or grandmother or more remote ancestor ; why a peculiarity is often transmitted from one sex to both sexes , or to one sex alone , more commonly but not exclusively to the like sex . It is a fact of some ...
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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