On the Origin of Species by Means of Natural Selection, Or, The Preservation of Favoured Races in the Struggle for LifeAppleton, 1898 - 432페이지 |
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vi 페이지
... land , and by occasional means — Dispersal during the Glacial period -Alternate Glacial periods in the North and South • 129 CHAPTER XIII . GEOGRAPHICAL DISTRIBUTION - continued . Distribution of fresh - water productions - On the ...
... land , and by occasional means — Dispersal during the Glacial period -Alternate Glacial periods in the North and South • 129 CHAPTER XIII . GEOGRAPHICAL DISTRIBUTION - continued . Distribution of fresh - water productions - On the ...
52 페이지
... land has been denuded , and how much sediment has been deposited . As Lyell has well remarked , the extent and thickness of our sedimentary formations are the result and the measure of the denudation which the earth's crust has ...
... land has been denuded , and how much sediment has been deposited . As Lyell has well remarked , the extent and thickness of our sedimentary formations are the result and the measure of the denudation which the earth's crust has ...
53 페이지
... land is exposed to the chemical action of the air and of the rain - water with its dissolved car- bonic acid , and in colder countries to frost ; the disin- tegrated matter is carried down even gentle slopes during heavy rain , and to a ...
... land is exposed to the chemical action of the air and of the rain - water with its dissolved car- bonic acid , and in colder countries to frost ; the disin- tegrated matter is carried down even gentle slopes during heavy rain , and to a ...
54 페이지
... land is worn away through subaerial and littoral action , it is good , in order to appreciate the past dura- tion of time , to consider , on the one hand , the masses of rock which have been removed over many extensive areas , and on ...
... land is worn away through subaerial and littoral action , it is good , in order to appreciate the past dura- tion of time , to consider , on the one hand , the masses of rock which have been removed over many extensive areas , and on ...
55 페이지
... land to show such prodigious movements ; the pile of rocks on either side of the crack having been smoothly swept away . On the other hand , in all parts of the world the piles of sedimentary strata are of wonderful thickness . In the ...
... land to show such prodigious movements ; the pile of rocks on either side of the crack having been smoothly swept away . On the other hand , in all parts of the world the piles of sedimentary strata are of wonderful thickness . In the ...
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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