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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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 ...
vii 페이지
... Characters of small functional importance , the most constant - Supposed incompetence of natural selection to account for the incipient stages of useful structures -Causes which interfere with the acquisition through natural selection ...
... Characters of small functional importance , the most constant - Supposed incompetence of natural selection to account for the incipient stages of useful structures -Causes which interfere with the acquisition through natural selection ...
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 ...
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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