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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100개의 결과 중 1 - 5개
vii 페이지
... Supposed incompetence of natural selection to account for the incipient stages of useful structures - Causes which in- terfere with the acquisition through natural selection of useful structures - Gradations of structure with changed ...
... Supposed incompetence of natural selection to account for the incipient stages of useful structures - Causes which in- terfere with the acquisition through natural selection of useful structures - Gradations of structure with changed ...
x 페이지
... supposed incompetency of natural selection to account for the incipient stages of useful structures . There is also a discussion on the causes which prevent in many cases the acquisition through natural selection of useful structures ...
... supposed incompetency of natural selection to account for the incipient stages of useful structures . There is also a discussion on the causes which prevent in many cases the acquisition through natural selection of useful structures ...
xix 페이지
... supposed " impulses " account in a scientific sense for the numerous and beautiful co- adaptations which we see throughout nature ; I cannot see that we thus gain any insight how , for instance , a woodpecker has become adapted to its ...
... supposed " impulses " account in a scientific sense for the numerous and beautiful co- adaptations which we see throughout nature ; I cannot see that we thus gain any insight how , for instance , a woodpecker has become adapted to its ...
xxiv 페이지
... supposed to have been caused by some miasma , have arisen and spread over the world , so at certain periods the germs of existing species may have been chemically affected by circum- ambient molecules of a particular nature , and thus ...
... supposed to have been caused by some miasma , have arisen and spread over the world , so at certain periods the germs of existing species may have been chemically affected by circum- ambient molecules of a particular nature , and thus ...
xxv 페이지
... suppose that each species of animal and plant , or each great type of organisation , was formed and placed upon the surface of the globe at long intervals by a distinct act of creative power ; HISTORICAL SKETCH . XXV.
... suppose that each species of animal and plant , or each great type of organisation , was formed and placed upon the surface of the globe at long intervals by a distinct act of creative power ; HISTORICAL SKETCH . XXV.
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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