Essay on the Origin of Languages
Essay on the Origin of Languages (French: Essai sur l'origine des langues) is an essay by Jean-Jacques Rousseau published posthumously in 1781. Rousseau had meant to publish the essay in a short volume which was also to include essays On Theatrical Imitation and The Levite of Ephraim.
Source: Wikipedia — Essay on the Origin of Languages (CC BY-SA 4.0)