The advance of thought concerning the climates of the earlier geological ages was long held in check by various erroneous notions which were the outgrowth of fundamental doctrines of the science, the fallacy of which had later to be proven. Of these fundamental doctrines were the Kant-Laplace theory of the origin of our planet, the doctrine of uniformitarianism wrongly interpreted, Croll's theory of the recurrence of glacial periods, and the conception of low polar air pressures and circumpolar whirls.

Because of the wide acceptance of the Kant-Laplace hypothesis, our earth was long supposed to have taken its later condition as a consequence of progressive surface cooling and congelation from a molten mass. When, therefore, the evidence for a period of glaciation within late geological time had been uncovered, it was but natural that this glaciation should be directly ascribed to a culmination of the earth's refrigerating process.

Theories of . . .
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