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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... Glacial period -Alternate Glacial periods in the North and South . . 129 CHAPTER XIII . GEOGRAPHICAL DISTRIBUTION - continued . Distribution of fresh - water productions - On the inhabitants of oceanic islands - Absence of Batrachians ...
... Glacial period -Alternate Glacial periods in the North and South . . 129 CHAPTER XIII . GEOGRAPHICAL DISTRIBUTION - continued . Distribution of fresh - water productions - On the inhabitants of oceanic islands - Absence of Batrachians ...
Página 67
... glacial epoch , which forms only a part of one whole geological period ; and likewise to reflect on the changes of level , on the extreme change of climate , and on the great lapse of time , all included within this same glacial period ...
... glacial epoch , which forms only a part of one whole geological period ; and likewise to reflect on the changes of level , on the extreme change of climate , and on the great lapse of time , all included within this same glacial period ...
Página 68
... glacial period near the mouth of the Mississippi , within that limit of depth at which marine animals can best flourish : for we know that great geographical changes occurred in other parts of America during this space of time . When ...
... glacial period near the mouth of the Mississippi , within that limit of depth at which marine animals can best flourish : for we know that great geographical changes occurred in other parts of America during this space of time . When ...
Página 83
... Glacial epoch , appears a very short time for the many and great mutations of life , which have certainly occurred since the Cambrian for- mation ; and the previous 140 million years can hardly be considered as sufficient for the ...
... Glacial epoch , appears a very short time for the many and great mutations of life , which have certainly occurred since the Cambrian for- mation ; and the previous 140 million years can hardly be considered as sufficient for the ...
Página 115
... glacial epoch , and note how little the specific forms of the inhabitants of the sea have been affected . On the theory of descent , the full meaning of the fossil remains from closely consecutive formations be- ing closely related ...
... glacial epoch , and note how little the specific forms of the inhabitants of the sea have been affected . On the theory of descent , the full meaning of the fossil remains from closely consecutive formations be- ing closely related ...
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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