[GEOMETRY]. MARQUIS DE L'HOSPITAL. Analytical treatise on conic sections and their use for the solution of equations in both determinate and indeterminate problems. Paris, Veuve et fils de Jean Boudot, 1707. In-4° bound in full blond speckled calf, spine gilt and gilt ribbed, gilt roulette on the edges (period binding). Ornamented with 1 important title finial by B. Picard, woodcut headpieces and footnotes, 1 engraved head vignette and 1 engraved lettering and 33 folding plates of geometry, numbered (except 1) with 286 figures. Uncommon first edition of this treatise on geometry, considered as a development of Descarte's Geometry. It was published posthumously after the illness of the author, a recognized academician in his time. Tired binding, some pages browned around the edges, some foxing. Handwritten bookplate in the form of a stamp of Fon[s]colombe. Fairly good condition, book would benefit from restoration Binding : Missing spine ends Cracked spine ends Spine rubbed with small tears Some corners dulled Wear to boards Inside pages : Freckling of variable density depending on the quires Some spotting and soiling Some ff. edges, especially at the beginning of the book, particularly browned Numbering error of some ff. without missing