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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xxvi 페이지
... admits the truth of the descent and modification of species , and supports this doctrine by many original observations . The first edition of this work was published on No- vember 24th , 1859 , and the second edition on January 7th ...
... admits the truth of the descent and modification of species , and supports this doctrine by many original observations . The first edition of this work was published on No- vember 24th , 1859 , and the second edition on January 7th ...
22 페이지
... admit that many domestic breeds must have originated in Europe ; for whence otherwise could they have been derived ? So it is in India . Even in the case of the breeds of the domestic dog throughout the world , which I admit are ...
... admit that many domestic breeds must have originated in Europe ; for whence otherwise could they have been derived ? So it is in India . Even in the case of the breeds of the domestic dog throughout the world , which I admit are ...
23 페이지
... admit the former existence of the most extreme forms , as the Italian greyhound , bloodhound , bull - dog , & c . , in the wild state . Moreover , the possibility of making distinct races by crossing has been greatly exaggerated . Many ...
... admit the former existence of the most extreme forms , as the Italian greyhound , bloodhound , bull - dog , & c . , in the wild state . Moreover , the possibility of making distinct races by crossing has been greatly exaggerated . Many ...
33 페이지
... admit that many of our domestic races are descended from the same parents - may they not learn a lesson of caution , when they deride the idea of species in a state of nature being lineal descendants of other species ? Principles of ...
... admit that many of our domestic races are descended from the same parents - may they not learn a lesson of caution , when they deride the idea of species in a state of nature being lineal descendants of other species ? Principles of ...
63 페이지
... admits that out of the 300 species , which will be enumerated in his Prodromus as belonging to the oak family , at least two - thirds are provisional species , that is , are not known strictly to fulfil the definition above given of a ...
... admits that out of the 300 species , which will be enumerated in his Prodromus as belonging to the oak family , at least two - thirds are provisional species , that is , are not known strictly to fulfil the definition above given of a ...
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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