Age and Area

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Abstract
Much of the criticism of this hypothesis is based on an incorrect appreciation of Age and Area, and especially of its necessary limitations, chief among which is the fact that the hypothesis itself is based on statistics, which are defined by Yule as quantitative data affected to a marked extent by a multiplicity of causes. Consequently only when a group of allied species, at least 10, is compared with another similar group, closely allied to the first, can one obtain any figures upon which an argument may be based. Up to the present time, no other explanation of such figures than Age and Area has been given. To work with single cases is simply asking for trouble. General consideration is also given to the other important provisos concerning constant conditions and barriers. The most important literature of recent years is referred to and discussed.

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