The first, second and third sections of this publication comprise respectively the papers communicated by him to the Academies of Sciences of Turin, Berlin and Paris; the fourth includes his miscellaneous contributions to other scientific collections, together with his additions to Euler's Algebra, and his Lecons elementaires at the Ecole Normale in 1795.
Besides the works mentioned above, Marat wrote: Recherches physiques sur l'electricite, &c. (1782); Recherches sur l'electricite medicale (1783); Notions elementaires d'optique (1764); Lettres de l'observateur Bon Sens a M.
But he is chiefly remembered for his "Essai d'une maniere de determiner les masses relatives des molecules elementaires des corps, et les proportions selon lesquelles elles entrent dans les combinaisons" (Journ.
Maillard in his These, Recherche des caracteristiques des systemes elementaires des courbes planes du troisieme ordre (Paris, 1871).
Vi, of his Ephemerides, 1763); Lecons elementaires de Mathematiques (1741), frequently reprinted; ditto de Mecanique (1743), &c.; ditto d' Astronomie (146), 4th edition augmented by Lalande (1779); ditto d'Optique (1750), &c. Calculations by him of eclipses for eighteen hundred years were inserted in L' Art de verifi s r les dates (1750); he communicated to the Academy in 1755 a classed catalogue of fortytwo southern nebulae, and gave in t.