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Origin of Species, by Charles Darwin

Chapter XII:
Geographical Distribution

Present distribution cannot be accounted for by differences in physical conditions — Importance of barriers — Affinity of the productions of the same continent — Centres of creation — Means of dispersal, by changes of climate and of the level of the land, and by occasional means — Dispersal during the Glacial period — Alternate Glacial Periods in the North and South.

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