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 63
Charles Darwin. and preserve the remains before they had time to de- cay . On the other hand , as long as the bed of the sea remains stationary , thick deposits cannot have been ac- cumulated in the shallow parts , which are the most ...
Charles Darwin. and preserve the remains before they had time to de- cay . On the other hand , as long as the bed of the sea remains stationary , thick deposits cannot have been ac- cumulated in the shallow parts , which are the most ...
Página 67
... all included within this same glacial period . Yet it may be doubted whether , in any quarter of the world , sedimentary deposits , in- including fossil remains , have gone on accumulating within the CHAP . X. ] IN ANY SINGLE FORMATION .
... all included within this same glacial period . Yet it may be doubted whether , in any quarter of the world , sedimentary deposits , in- including fossil remains , have gone on accumulating within the CHAP . X. ] IN ANY SINGLE FORMATION .
Página 68
... remains will prob- ably first appear and disappear at different levels , ow- ing to the migrations of species and to geographical changes . And in the distant future , a geologist , ex- amining these beds , would be tempted to conclude ...
... remains will prob- ably first appear and disappear at different levels , ow- ing to the migrations of species and to geographical changes . And in the distant future , a geologist , ex- amining these beds , would be tempted to conclude ...
Página 69
... remains , except near their upper or lower limits . It would seem that each separate formation , like the whole pile of formations in any country , has generally been intermittent in its accumulation . When we see , as is so often the ...
... remains , except near their upper or lower limits . It would seem that each separate formation , like the whole pile of formations in any country , has generally been intermittent in its accumulation . When we see , as is so often the ...
Página 74
... sea , or where it did not accumulate at a sufficient rate to protect organic bodies from decay , no remains could be preserved . Formations rich in fossils of many kinds , and of 74 ABSENCE OF INTERMEDIATE VARIETIES [ CHAP . X.
... sea , or where it did not accumulate at a sufficient rate to protect organic bodies from decay , no remains could be preserved . Formations rich in fossils of many kinds , and of 74 ABSENCE OF INTERMEDIATE VARIETIES [ CHAP . X.
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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