On the Origin of Species by Means of Natural Selection: Or, The Preservation of Favoured Races in the Struggle for LifeEaston Press, 1976 - 470 páginas |
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Página 156
... species , possessing an air- breathing apparatus and fitted to live out of the water . In two of these families , which were more especially examined by Müller , and which are nearly related to each other , the species ... belonging to both ...
... species , possessing an air- breathing apparatus and fitted to live out of the water . In two of these families , which were more especially examined by Müller , and which are nearly related to each other , the species ... belonging to both ...
Página 306
... species belonging to some one group has seized on the place occupied by a species belonging to a distinct group , and thus have caused its extermination . If many allied forms be developed from the successful intruder , many will have ...
... species belonging to some one group has seized on the place occupied by a species belonging to a distinct group , and thus have caused its extermination . If many allied forms be developed from the successful intruder , many will have ...
Página 389
... species belonging to distinct classes have often been adapted by successive slight modifications to live under ... species . This excellent observer has shown that in some districts of S. America , where , for instance , an Ithomia ...
... species belonging to distinct classes have often been adapted by successive slight modifications to live under ... species . This excellent observer has shown that in some districts of S. America , where , for instance , an Ithomia ...
Contenido
VARIATION UNDER NATURE | 30 |
STRUGGLE FOR EXISTENCE | 45 |
NATURAL SELECTION | 59 |
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Términos y frases comunes
accumulated adapted admit affinities allied species America ancient appear beak become bees believe belonging birds breeds cause cells characters climate closely allied colour common progenitor continuous crossed crustaceans degree developed difficulty distinct species divergence doubt effects eggs embryo existing exterminated extinct extremely facts favourable fertilised fertility flowers formation forms fossil Fritz Müller genera genus geological geological period gradations greater number groups of species habits Hence hybrids hybrids produced important increase individuals inhabitants inherited insects instance instincts intercrossing intermediate kind lamellæ larvæ less living male mammals manner marsupials migration modified descendants natural selection naturalists nearly nest occasionally offspring organisation organs Origin of Species parent peculiar perfect pigeons pistil plants pollen present preserved principle probably produced quadrupeds ranked reciprocal crosses remarked resemblance rudimentary seeds slight South America stamens sterility structure struggle successive supposed swimbladder theory variability variations varieties vary whilst whole wings young