<p style='text-align: justify;'>Opening page of ʿAlī ibn ʿĪsā, Taḏkirat al-Kaḥḥālīn (‘Memorandum for opticians’), with a mention of Galen in the introductory paragraph (ed. Hyderabad 1964, p.1). Recto upper margin contains Hebrew alphabetical exercises; lower margin contains three lines of text in Judaeo-Arabic that appear to be part of a letter dealing with trade or commerce.</p>