Still, from time to time, and in consequence of this very movement, the ancient slang crops up again and becomes new once more. It has its headquarters where it maintains its sway. The Temple preserved the slang of the seventeenth century; Bicêtre, when it was a prison, preserved the slang of Thunes. There one could hear the termination in anche of the old Thuneurs. Boyanches-tu (bois-tu), do you drink? But perpetual movement remains its law, nevertheless.

If the philosopher succeeds in fixing, for a moment, for purposes of observation, this language which is incessantly evaporating, he falls into doleful and useful meditation. No study is more efficacious and more fecund in instruction. There is not a metaphor, not an analogy, in slang, which does not contain a lesson. Among these men, to beat means to feign; one beats a malady; ruse is their strength.