The Origin of Species by Means of Natural Selection Or, The Preservation of Favored Races in the Struggle for LifeD. Appleton and Company, 1882 - 458페이지 |
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xiii 페이지
... here see the principle of natural selection shadowed forth , but how little Aristotle fully comprehended the principle , is shown by his ren arkı on the formation of the eeth . works he upholds the doctrine that all species , including.
... here see the principle of natural selection shadowed forth , but how little Aristotle fully comprehended the principle , is shown by his ren arkı on the formation of the eeth . works he upholds the doctrine that all species , including.
xiv 페이지
... shown in the Intro- duction to a work written in 1794 and 1795 , but not published till long afterwards he has pointedly remarked ( ' Goethe als Naturforscher , ' von Dr. Karl Meding , s . 34 ) that the future question for naturalists ...
... shown in the Intro- duction to a work written in 1794 and 1795 , but not published till long afterwards he has pointedly remarked ( ' Goethe als Naturforscher , ' von Dr. Karl Meding , s . 34 ) that the future question for naturalists ...
xviii 페이지
... shown in this historical sketch , were long ago preceded by Dr. Wells and Mr. Matthews . M. Isidore Geoffroy Saint Hilaire , in his Lectures delivered in 1850 ( of which a Résumé appeared in the Revue et Mag . de Zoolog . , Jan. 1851 ) ...
... shown in this historical sketch , were long ago preceded by Dr. Wells and Mr. Matthews . M. Isidore Geoffroy Saint Hilaire , in his Lectures delivered in 1850 ( of which a Résumé appeared in the Revue et Mag . de Zoolog . , Jan. 1851 ) ...
2 페이지
... shown how the innumerable species inhabiting this world have been modified , so as to acquire that perfection of structure and coadaptation which justly excites our admiration . Naturalists continually refer to external conditions ...
... shown how the innumerable species inhabiting this world have been modified , so as to acquire that perfection of structure and coadaptation which justly excites our admiration . Naturalists continually refer to external conditions ...
6 페이지
... shown in my work on ' Variation under Domestication , ' there are two factors namely , the nature of the organism , and the nature of the conditions . The former seems to be much the more important ; for nearly similar variations ...
... shown in my work on ' Variation under Domestication , ' there are two factors namely , the nature of the organism , and the nature of the conditions . The former seems to be much the more important ; for nearly similar variations ...
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adapted admit affinities allied species America analogous ancient appear Asa Gray beak become bees believe belonging birds breeds cause cells characters climate closely allied colour continued crossed crustaceans degree developed difficulty distinct species doubt effects eggs embryo existing extinct extremely facts favourable fertilised fertility flowers formations formerly forms fossil Fritz Müller genera genus geological Glacial period gradations greater number groups of species habits Hence hybrids important 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 reproductive resemblance rudimentary seeds sexual selection slight South America stamens sterility structure struggle successive supposed theory tion variability variations varieties vary whilst whole wings young