The Origin of Species by Means of Natural Selection: Or, The Preservation of Favored Races in the Struggle for Life, Volumen2D. Appleton, 1898 |
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Página 16
... according as the one species or the other is used as the father or the mother , there is gen- erally some difference , and occasionally the widest pos- sible difference , in the facility of effecting an union . The hybrids , moreover ...
... according as the one species or the other is used as the father or the mother , there is gen- erally some difference , and occasionally the widest pos- sible difference , in the facility of effecting an union . The hybrids , moreover ...
Página 28
... according to Mr. Herbert Spencer , being that life depends on , or consists in , the incessant action and reaction of various forces , which , as throughout nature , are always tending towards an equilibrium ; and when this tendency is ...
... according to Mr. Herbert Spencer , being that life depends on , or consists in , the incessant action and reaction of various forces , which , as throughout nature , are always tending towards an equilibrium ; and when this tendency is ...
Página 42
... according to Gärtner the same laws . When two species are crossed , one has sometimes a prepotent power of impressing its likeness on the hybrid . So I believe it to be with varieties of plants ; and with animals one variety cer- tainly ...
... according to Gärtner the same laws . When two species are crossed , one has sometimes a prepotent power of impressing its likeness on the hybrid . So I believe it to be with varieties of plants ; and with animals one variety cer- tainly ...
Página 54
... according to our ideas of time , more forcibly than the conviction thus gained that sub- aerial agencies which apparently have so little power , and which seem to work so slowly , have produced great results . When thus impressed with ...
... according to our ideas of time , more forcibly than the conviction thus gained that sub- aerial agencies which apparently have so little power , and which seem to work so slowly , have produced great results . When thus impressed with ...
Página 57
... according to the standard of years , how long a period it takes to modify a species ; but to the subject of time we must return . On the Poorness of Palaeontological Collections . Now let us. 30 CHAP . X. ] 57 THE LAPSE OF TIME .
... according to the standard of years , how long a period it takes to modify a species ; but to the subject of time we must return . On the Poorness of Palaeontological Collections . Now let us. 30 CHAP . X. ] 57 THE LAPSE OF TIME .
Otras ediciones - Ver todas
The Origin of Species by Means of Natural Selection: Or the ..., Volumen2 Darwin Vista completa - 1889 |
On the Origin of Species by Means of Natural Selection Charles Darwin Sin vista previa disponible - 2016 |
Términos y frases comunes
admit affinity allied species ancient animals appear Archipelago arctic areas become believe belonging birds Cambrian changes characters cies classification climate closely allied continent crustaceans degree deposited difficulty distant distinct species domestic doubt embryo eral Europe existing extinct fact faunas fertilised fertility flowers formations formerly forms fossil fresh-water Fritz Müller Gärtner genera genus geological period geological record Glacial period groups of species habits hybrids hybrids produced important inhabitants inherited insects instance intermediate intervals land larvæ less living mammals manner marine Marsupials migration modified descendants mongrels mountains natural selection naturalists nearly occur oceanic islands offspring organisation palæontologists Palæozoic parent parent-form peculiar perfect pistil plants pollen present probably produced quadrupeds reciprocal crosses regions remains remarked reproductive resemblance rocks rudimentary organs seeds Silurian South America stage stamens sterility structure successive suppose terrestrial tertiary theory tion variations varieties whilst whole widely different wings