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 in France. Buffon was compelled to retract hypotheses which he put forward about the formation of the earth in his Natural History (1749), and to state that he believed implicitly in the Bible account of Creation.

At the beginning of the nineteenth century Laplace worked out the mechanics of the universe, on the nebular hypothesis. His results dispensed, as he said to Napoleon, with the hypothesis of God, and were duly denounced. His theory involved a long physical process before the earth and solar system came to be formed; but this was not fatal, for a little ingenuity might preserve the credit of the first chapter of Genesis. Geology was to prove a more formidable enemy to the Biblical story of the Creation and the Deluge. The theory of a French naturalist (Cuvier) that the earth had repeatedly experienced catastrophes, each of which necessitated a new creative act, helped for a time to save the belief in divine intervention, and Lyell, in his Principles of Geology (1830), while he undermined the assumption of catastrophes, by showing that the earth's history could be explained by the ordinary processes which we still see in operation, yet held fast to successive acts of creation. It was not till 1863 that he presented fully, in his Antiquity of Man, the