The Origin of Species by Means of Natural Selection: Or the Preservation of Favored Races in the Struggle for LifeD. Appleton, 1904 - 435페이지 |
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xiv 페이지
... natural selection shadowed forth , but how little Aristotle fully comprehended the principle , is shown by his remarks on the formation of the teeth . branches of trees . But he likewise believed in a xiv HISTORICAL SKETCH . INTRODUCTION.
... natural selection shadowed forth , but how little Aristotle fully comprehended the principle , is shown by his remarks on the formation of the teeth . branches of trees . But he likewise believed in a xiv HISTORICAL SKETCH . INTRODUCTION.
xv 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 Natur- forscher , ' 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 Natur- forscher , ' von Dr. Karl Meding , s . 34 ) that the future question for naturalists ...
xxii 페이지
... shown in this historical sketch , were long ago preceded by Dr. Wells and Mr. Matthews . M. Isidore Geoffroy Saint - Hilaire , in his lectures de- livered in 1850 ( of which a Résumé appeared in the Revue et Mag . de Zoolog . , ' Jan ...
... shown in this historical sketch , were long ago preceded by Dr. Wells and Mr. Matthews . M. Isidore Geoffroy Saint - Hilaire , in his lectures de- livered in 1850 ( of which a Résumé appeared in the Revue et Mag . de Zoolog . , ' Jan ...
3 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 ...
8 페이지
... shown in my work on ' Variation under Domestication , ' there are two factors : namely , the nature of the organ- ism , and the nature of the conditions . The former seems to be much the more important ; for nearly similar vari- ations ...
... shown in my work on ' Variation under Domestication , ' there are two factors : namely , the nature of the organ- ism , and the nature of the conditions . The former seems to be much the more important ; for nearly similar vari- ations ...
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adapted affinities allied species America ancient appear Asa Gray beak become bees believe belonging birds breeds cause cells characters climate closely allied colour common continent crossed crustaceans degree developed difficulty distinct species domestic doubt effects eggs embryo existing extinct extremely facts favourable fertilised fertility flowers formation forms fossil Fritz Müller genera genus geological geological period 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 males mammals manner marsupials migration modified descendants natural selection naturalists nearly nest occasionally offspring organisation organs parent peculiar perfect pigeon pistil pollen present principle probably produced progenitor quadrupeds ranked remarked resemblance rudimentary seeds sexual selection Silurian slight South America stamens sterility structure successive supposed swimbladder tend theory tion trees variability variations varieties vary whilst whole wings young