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2 Leuven University courses on geometry and astronomy. 1772 1. "Tractatus de geometria." C. 20.5 x 16 cm, [1]-24-[188, 1 bl.] pp., paper, Latin. Contemporary half vellum, marbled paper on the covers, flat spine (slightly loosening, rubbed). With 13 folding pen drawings (4 loose) and 1 folding engraving by C.H. Becker (loose). Ref. Ex cathedra, Becker 1. - 2. "Elementa astronomiae & Tractatus de sphaera." 2 parts in 1 vol.: [I] [1 bl., 79] ff., [II] [64] ff. Illustrations: [I] a single pen drawing in the text, 9 folding pen drawings, 6 folding engravings (some on bluish paper); [II] 1 folding engraving; a quire with 3 engravings loosely inserted. Contemporary leather (worn, spine damaged, leather on covers gone). Ref. Ex Cathedra: Hayé 13, 20, 26. - Tielemans 3. - Blendeff 29. - Denique 9. - Becker 8 and 6 (De motu 1–3).
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