He released a "Mappa Europae" (map of Europe) in 1536. In 1537 he published a Hebrew Gospel of Matthew which he had obtained from Spanish Jews he had converted. In 1540 he published a Latin edition of Ptolemy's "Geographia" with illustrations. The 1550 edition contains cities, portraits, and costumes. These editions, printed in Germany, are the most valued of this work. Other writings that followed are "Horologiographia" (a treatise on dialling – constructing sundials, Basel, 1531), and "Organum Uranicum" (a treatise on the planetary motions, 1536).