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The Law of three stages is a theory of the evolution culminating in positivist sociology. At first the subject was conceived in the theological fashion, and all problems were explained by the will of some deity—as when the stars were gods, or the chariots of gods; later, the same subject reached the metaphysical stage, and was explained by metaphysical abstractions-—as when the stars moved in circles because circles were the most perfect figure; finally the subject was reduce to positive science by precise observation, hypothesis, and experiment, and its phenomena were explained through the regularities of natural cause and effect.

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