A Treatise on Religious Toleration. Occasioned by the Execution of the Unfortunate John Calas; Unjustly Condemned ... for the Supposed Murder of His Own Son. Translated from the French of Mr. de Voltaire, ...: Buy A Treatise on Religious Toleration. Occasioned by the Execution of the Unfortunate John Calas; Unjustly Condemned ... for the Supposed Murder of His Own Son. Translated from the French of Mr. de Voltaire, ... by Voltaire at Low Price in India