EULER, LEONHARD. Introductio in analysin infinitorum. Engraved frontispiece; portrait of the dedicatee, Jean-Jacques Dortous de Mairan; 40 folding diagrammatic plates; folding table. [4], xvi, 320; [2] (of [4]), 398, [2] pages, including leaf of directions to binder at end; lacks Volume 2 initial blank. 2 volumes. 4to, 245x193 mm, 19th-century speckled calf gilt with Signet Library arms on covers, spines worn, covers and Volume 1 opening leaves detached; varying toning and foxing, occasionally heavy, most plates browned, some with light dampstains, marginal tears on a few text leaves not affecting text, scattered pencil marginalia. Lausanne: Marc-Michel Bousquet, 1748