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 most characteristic thing in Bayle's treatise is his sceptical argument that, even if it were a right principle to suppress error by force, no truth is certain enough to justify us in applying the theory. We shall see (next chapter) this eminent scholar's contribution to rationalism.

Though there was an immense exodus of Protestants from France, Louis did not succeed in his design of extirpating heresy from his lands. In the eighteenth century, under Louis XV, the presence of Protestants was tolerated though they were outlaws; their marriages were not recognized as legal, and they were liable at any moment to persecution. About the middle of the century a literary agitation began, conducted mainly by rationalists, but finally supported by enlightened Catholics, to relieve the affliction of the oppressed sect. It resulted at last in an Edict of Toleration (1787), which made the position of the Protestants endurable, though it excluded them from certain careers.

The most energetic and forceful leader in the campaign against intolerance was Voltaire (see next chapter), and his exposure of some glaring cases of unjust persecution did more than general arguments to achieve the object. The most infamous case was that of Jean Calas, a Protestant merchant of Toulouse, whose son committed suicide. A report