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
xviii 페이지
... nearly de- populated at successive periods , and then re - stocked ; and he gives as an alternative , that new forms may be generated " without the presence of any mould or germ of former aggregates . " I am not sure that I understand ...
... nearly de- populated at successive periods , and then re - stocked ; and he gives as an alternative , that new forms may be generated " without the presence of any mould or germ of former aggregates . " I am not sure that I understand ...
1 페이지
... I have steadily pursued the same object . I hope that I may be ex- cused for entering on these personal details , as I give them to show that I have not been hasty in coming to a decision . My work is now ( 1859 ) nearly finished ; 1.
... I have steadily pursued the same object . I hope that I may be ex- cused for entering on these personal details , as I give them to show that I have not been hasty in coming to a decision . My work is now ( 1859 ) nearly finished ; 1.
8 페이지
... nearly similar vari- ations sometimes arise under , as far as we can judge , dissimilar conditions ; and , on the other hand , dissimilar variations arise under conditions which appear to be nearly uniform . The effects on the offspring ...
... nearly similar vari- ations sometimes arise under , as far as we can judge , dissimilar conditions ; and , on the other hand , dissimilar variations arise under conditions which appear to be nearly uniform . The effects on the offspring ...
9 페이지
... nearly the same food , deviations of structure so strongly pronounced as to deserve to be called monstrosities arise ; but monstrosities cannot be separated by any distinct line from slighter variations . All such changes of structure ...
... nearly the same food , deviations of structure so strongly pronounced as to deserve to be called monstrosities arise ; but monstrosities cannot be separated by any distinct line from slighter variations . All such changes of structure ...
10 페이지
... nearly the same manner as the chill affects different men in an indefinite manner , ac- cording to their state of body or constitution , causing coughs or colds , rheumatism , or inflammation of various organs . With respect to what I ...
... nearly the same manner as the chill affects different men in an indefinite manner , ac- cording to their state of body or constitution , causing coughs or colds , rheumatism , or inflammation of various organs . With respect to what I ...
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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