On the Origin of Species by Means of Natural Selection, Or, The Preservation of Favoured Races in the Struggle for LifeAppleton, 1898 |
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Página 20
... regions are often sterile when crossed ; now it could clearly have been of no advantage to such sepa- rated species to have been rendered mutually sterile , and consequently this could not have been ' effected through natural selection ...
... regions are often sterile when crossed ; now it could clearly have been of no advantage to such sepa- rated species to have been rendered mutually sterile , and consequently this could not have been ' effected through natural selection ...
Página 60
... accord with the belief of vast intervals of time having elapsed between each formation . We can , I think , see why the geological formations . of each region are almost invariably intermittent ; that is 60 [ CHAP . X. THE POORNESS OF OUR.
... accord with the belief of vast intervals of time having elapsed between each formation . We can , I think , see why the geological formations . of each region are almost invariably intermittent ; that is 60 [ CHAP . X. THE POORNESS OF OUR.
Página 61
Charles Darwin. of each region are almost invariably intermittent ; that is , have not followed each other in close sequence . Scarcely any fact struck me more when examining many hundred miles of the South American coasts , which have ...
Charles Darwin. of each region are almost invariably intermittent ; that is , have not followed each other in close sequence . Scarcely any fact struck me more when examining many hundred miles of the South American coasts , which have ...
Página 64
... region of Parime is described by Humboldt as being at least nineteen times as large as Switzerland . South of the Amazon , Boué colours an area composed of rocks of this nature as equal to that of Spain , France , Italy , part of ...
... region of Parime is described by Humboldt as being at least nineteen times as large as Switzerland . South of the Amazon , Boué colours an area composed of rocks of this nature as equal to that of Spain , France , Italy , part of ...
Página 65
... region , namely , to the United States and Canada , as shown in Professor H. D. Rogers's beautiful map , I have ... regions the metamorphic and granitic rocks would be found much more widely ex- tended than they appear to be , if ...
... region , namely , to the United States and Canada , as shown in Professor H. D. Rogers's beautiful map , I have ... regions the metamorphic and granitic rocks would be found much more widely ex- tended than they appear to be , if ...
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Términos y frases comunes
admit affinity allied species ancient animals appear Archipelago arctic areas become believe birds Cambrian changes characters cies classification climate closely allied common progenitor 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 individuals 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 parent parent-form peculiar perfect pistil plants pollen present probably produced quadrupeds reciprocal crosses regions remains remarked reproductive resemblance rocks rudimentary organs sediment seeds Silurian South America stage stamens sterility structure successive suppose terrestrial tertiary theory tion variations varieties whilst widely different wings