MANUSCRIPTS -- ARABIC MANUSCRIPT on Sexual Science and the Natural Sciences (Kitâb fî al-bâh wa-l-'ulûm al-tabî'iyya). Cairo(?), c. 1820-1850 CE / 1235-1266 AH. Approx. 198 lvs. (including 11 blanks). Manuscript in Arabic naskh script, with rubrication throughout and occasional touches of golden ink, including an astrological diagram on a leaf numbered 14 and marginal annotations. European paper with watermarks. Dimensions: 22x17 cm; written area 12x10 cm. Cont. blindtooled brown leather binding w. flap, dec. paper laid down on both sides. (Spine a bit dam., 2 lvs. w. embossed ownership stamps, minor worming at final leaves).