Marat published "A Philosophical Essay on Man," in 1773 and "Chains of Slavery," in 1774.de Cock, J. & Goetz, C., Œuvres de Jean-Paul Marat, 10 volumes, Éditions Pôle Nord, Brussels, 1995. Voltaire's sharp critique of "De l'Homme" (an augmented translation, published 1775–76), partly in defence of his protégé Helvétius, reinforced Marat's growing sense of a widening gulf between the philosophes, grouped around Voltaire on one hand, and their opponents, loosely grouped around Rousseau on the other.
Marat published "A Philosophical Essay on Man" in 1773 and "Chains of Slavery" in 1774de Cock J & Goetz C Œuvres de Jean-Paul Marat 10 volumes Éditions Pôle Nord Brussels 1995 Voltaire's sharp critique of "De l'Homme" (an augmented translation published 1775–76) partly in defence of his protégé Helvétius reinforced Marat's growing sense of a widening gulf between the philosophes grouped around Voltaire on one hand and their opponents loosely grouped around Rousseau on the other