GALILEI, GALILEO. Systema cosmicum . . . in quo quatuor dialogis de duobus maximis mundi systematibus, Ptolemaico & Copernicano . . . disseritur. Woodcut text diagrams. [16], 495, [25] pages, including engraved additional title, portrait of Galileo, and errata leaf at end. bound with his: Tractatus de proportionum instrumento. Woodcut text diagrams. [8], 104 pages; lacks the folding plate. Together, 2 volumes in one. 4to, 193x146 mm, contemporary vellum boards panelled in blind, rear cover discolored, recased, endpapers renewed; contents of both works lightly toned with scattered marginal spotting, occasional light marginal soiling, additional title and portrait in first work cropped in outer and lower margins, additional title also worn along edges, small paper flaw in blank lower margin of letterpress title, early marginalia on a3v, underscoring in ink on 2F1, dampstaining in lower outer corner throughout the second work. Strassburg: David Hautt for Elzevier, 1635; David Hautt, 1635