[Mathematics] Two very rare Ghent editions: (1) De klaere ende gemakkelykke arithmetia,

ofte cyfer-konst verthoont sonder duysternisse ende moyelykheyd. Inhoudende alle de Specien in 't geheel ende in 't Gebroken (...) Alles soo verstaendelyk ende bevattelyk voorengestelt, dat men dese Konst sonder mondelyk Onderwys by zig zelven kan leeren. Gemaekt door F. Naert. Ghent, Weduwe van Michiel de Goesin, 1772, (8),238,(2) p., with letterpress title frame and ornaments, many tables and examples, contemporary marbled sheepskin, gilt and ribbed back with morocco letterpiece (minimal defects, lovely copy).

Extremely rare work, of which still three editions appeared at Weduwe Michiel de Goesin in 1762, 1772 and 1800. A 1788 edition with another Ghent printer is also known. Of all these editions, we found one or only a handful of copies in libraries (our edition one or two, this remains unclear to us), nearly all in Belgium; (2) De vernieuwde cyffer-konst, Noyt voor dezen zoo gedrukt nochte den Leerling grondiger en duidelyker voorgesteld. Door David Cock. van Enchuysen. Vermeerderd met verscheyde Vraegstukken en Wissels uytgewerkt door den Ketting-regel (...) door J.B. Wappers van Antwerpen. Nauwkeurig overzien, en merkelyk verbeterd. Ghent, B. Poelman, 1799, (2),272,(2) p., with many letterpress examples, contemporary marbled sheepskin, gilt and ribbed back. Possibly lacks a half title; worm holes in top corners, lacks free endpaper. Binding lacks letterpiece and light wear (total 2).