The Origin of Species by Means of Natural Selection: Or the Preservation of Favored Races in the Struggle for LifeD. Appleton, 1904 - 435 páginas |
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Página 47
... hand , cats , from their nocturnal rambling habits , cannot be easily matched , and , although so much valued by women and children , we rarely see a distinct breed ong kept up ; such breeds as we do sometimes see are almost always ...
... hand , cats , from their nocturnal rambling habits , cannot be easily matched , and , although so much valued by women and children , we rarely see a distinct breed ong kept up ; such breeds as we do sometimes see are almost always ...
Página 60
... likewise necessarily occurs with closely allied organisms , which inhabit distinct conti- nents or islands . When , on the other hand , an animal or plant ranges over the same continent , or inhabits 60 [ CHAP . II . DOUBTFUL SPECIES .
... likewise necessarily occurs with closely allied organisms , which inhabit distinct conti- nents or islands . When , on the other hand , an animal or plant ranges over the same continent , or inhabits 60 [ CHAP . II . DOUBTFUL SPECIES .
Página 69
... hand , if we look at each species as a special act of creation , there is no apparent reason why more varieties should occur in a group having many species , than in one hav- ing few . To test the truth of this anticipation I have ...
... hand , if we look at each species as a special act of creation , there is no apparent reason why more varieties should occur in a group having many species , than in one hav- ing few . To test the truth of this anticipation I have ...
Página 77
... hand of Nature . But Natural Selection , as we shall hereafter see , is a power incessantly ready for action , and is as immeasurably superior to man's feeble efforts , as the works of Nature are to those of Art . We will now discuss in ...
... hand of Nature . But Natural Selection , as we shall hereafter see , is a power incessantly ready for action , and is as immeasurably superior to man's feeble efforts , as the works of Nature are to those of Art . We will now discuss in ...
Página 84
... hand , in some cases , as with the elephant , none are destroyed by beasts of prey ; for even the tiger in India most rarely dares to attack a young elephant protected by its dam . Climate plays an important part in determining the ...
... hand , in some cases , as with the elephant , none are destroyed by beasts of prey ; for even the tiger in India most rarely dares to attack a young elephant protected by its dam . Climate plays an important part in determining the ...
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Términos y frases comunes
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