Fûki Jinkôki kômoku [Details on rich mathematics]. Jôô 3  22 x 16 cm: 39 pp., text and illustrations (stains, wormholes, many traces of use, 1st page partly rubbed, last page illustration: elephant with ink stains). Four-hole stab binding (thread broken), book cover with ink inscription (worn, folds, stains, ink traces), last endpaper inscribed with publication date, back cover with inscriptions, scribbles, soiled with ink). Rare 17th-c. book on mathematics, first page with ill. of gods of fortune working and measuring. Adaption of Yoshida Mitsuyoshi's Jinkôki. Contains most of the subjects of the expanded 1631 Jinkôki, explanations on the use of the Japanese abacus, problems of measurements of planes and solids and recreational problems.
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