Mathematics.- Mydorge (Claude) Prodromi catoptricorum et dioptricorum sive conicorum operis, first complete edition, woodcut device on title, woodcut diagrams, foxing and browning, light marginal water-stain towards end, lacks leaf of dedication to Cavendish (as often), contemporary limp vellum, folio, Paris, Jean Dedin, 1639.

⁂ First complete edition of Mydorge's work on conic sections, intended to provide the geometrical basis for the study of optics (books I & II had been published in 1631). It contains hundreds of problems published for the first time, as well as a multitude of ingenious and original methods that later geometers frequently used, usually without citing their source.