The Origin of Species by Means of Natural Selection: Or, the Preservation of Favored Races in the Struggle for Life, Volumen1D. Appleton, 1898 |
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Página xvii
... known paper ( Edinburgh Philosophi- cal Journal , ' vol . xiv . p . 283 ) on the Spongilla , clearly declares his belief that species are descended from other species , and that they become improved in the course of modification . This ...
... known paper ( Edinburgh Philosophi- cal Journal , ' vol . xiv . p . 283 ) on the Spongilla , clearly declares his belief that species are descended from other species , and that they become improved in the course of modification . This ...
Página xxiv
... known French botanist , M. Lecoq , writes in 1854 ( Etudes sur Géograph . Bot . , ' tom . i . p . 250 ) , " On voit que nos recherches sur la fixité ou la variation de l'espèce , nous conduisent directement aux idées palæontologist ...
... known French botanist , M. Lecoq , writes in 1854 ( Etudes sur Géograph . Bot . , ' tom . i . p . 250 ) , " On voit que nos recherches sur la fixité ou la variation de l'espèce , nous conduisent directement aux idées palæontologist ...
Página 5
... known laws of variation . In the five succeeding chapters , the most apparent and gravest difficulties in accepting the theory will be given : namely , first , the difficulties of transitions , or how a simple being or a simple organ ...
... known laws of variation . In the five succeeding chapters , the most apparent and gravest difficulties in accepting the theory will be given : namely , first , the difficulties of transitions , or how a simple being or a simple organ ...
Página 12
... known suddenly to assume a new character ; and as buds on distinct trees , growing under different con- ditions , have sometimes yielded nearly the same variety -for instance , buds on peach - trees producing nec- tarines , and buds on ...
... known suddenly to assume a new character ; and as buds on distinct trees , growing under different con- ditions , have sometimes yielded nearly the same variety -for instance , buds on peach - trees producing nec- tarines , and buds on ...
Página 16
... known to ap- pear at the corresponding caterpillar or cocoon stage . But hereditary diseases and some other facts make me believe that the rule has a wider extension , and that , when there is no apparent reason why a peculiarity should ...
... known to ap- pear at the corresponding caterpillar or cocoon stage . But hereditary diseases and some other facts make me believe that the rule has a wider extension , and that , when there is no apparent reason why a peculiarity should ...
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Términos y frases comunes
adapted advantage allied analogous animals and plants appear Asa Gray beak become bees believe birds breeds caudicle cause cells characters climate closely colour common crossed cuckoo degree descendants developed difficulty distinct species disuse divergence domestic animals domestic races doubt effects eggs existence extinct extremely facts favourable females flowers forms Fritz Müller genera genus giraffe gradations greater number groups habits Hence hermaphrodites hive-bee important increase inhabitants inherited insects instance instincts intercrossing intermediate kind lamellæ large number larger genera larvæ less males manner Melipona Mivart modified natural selection naturalists nearly nest occasionally offspring organisation organs origin Origin of Species parent perfect period pigeons pollen pollen-grains present preserved prey principle probably produced progenitor quadrupeds rank rarely Red Grouse relation remarked resemble rock-pigeon seeds sexes sexual selection slight stamens striped structure struggle supposed swimbladder tend tendency tion tree variability variations varieties vary widely wings young