D'ALEMBERT, Jean le Rond. Opuscules Mathématiques, ou Mémoires sur différens Sujets de Géométrie, Paris: David, 1761-68, volumes I-IV only (of 8), 4°, half title to vol. IV, 12 engraved folding plates (upper margin of some plates lightly dampstained, light spotting throughout, a few leaves detached), contemporary calf (worn). [Brunet II, 471] With 3 other works, including Alexis C. Clairaut's Elémens d'Algebre (Paris, 1749). (7)