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 327
... facts could be given with respect to the inhabitants of the sea . A second great fact which strikes us in our general review is , that Importance of barriers of any kind , or obstacles to free migration , are related in a close barriers ...
... facts could be given with respect to the inhabitants of the sea . A second great fact which strikes us in our general review is , that Importance of barriers of any kind , or obstacles to free migration , are related in a close barriers ...
Página 349
... facts could be given in regard to terrestrial animals . In marine productions , similar cases likewise occur ; as an example , I may quote a statement by the highest authority , Prof. Dana , that " it is certainly a wonderful fact that ...
... facts could be given in regard to terrestrial animals . In marine productions , similar cases likewise occur ; as an example , I may quote a statement by the highest authority , Prof. Dana , that " it is certainly a wonderful fact that ...
Página 433
... fact of the fossil remains of each formation being in some degree intermediate in character between the fossils in the formations above and below , is simply explained by their inter- mediate position in the chain of descent . The grand ...
... fact of the fossil remains of each formation being in some degree intermediate in character between the fossils in the formations above and below , is simply explained by their inter- mediate position in the chain of descent . The grand ...
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