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 95
... extinct remains . We shall , when we come to our chapter on Geology , have to refer again to this subject , and I think we shall then see that the diagram throws light on the affinities of extinct beings , which , though generally ...
... extinct remains . We shall , when we come to our chapter on Geology , have to refer again to this subject , and I think we shall then see that the diagram throws light on the affinities of extinct beings , which , though generally ...
Página 311
... extinct species can all be classed either in still existing groups , or between them . That the extinct forms of life help to fill up the intervals between existing genera , families , and orders , is certainly true ; but as this ...
... extinct species can all be classed either in still existing groups , or between them . That the extinct forms of life help to fill up the intervals between existing genera , families , and orders , is certainly true ; but as this ...
Página 325
... Extinct forms are seldom directly intermediate between existing forms ; but are intermediate only by a long and circuitous course through other extinct and different forms . We can clearly see why the organic remains of closely ...
... Extinct forms are seldom directly intermediate between existing forms ; but are intermediate only by a long and circuitous course through other extinct and different forms . We can clearly see why the organic remains of closely ...
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