<p style='text-align: justify;'>Leaf from a Judaeo-Arabic version of ʿAlī ibn ʿĪsā, Taḏkirat al-Kaḥḥālīn (‘Memorandum for opticians’), end of first discourse and beginning of second discourse (ed. Hyderabad 1964, pp. 39-42). The end of the first discourse preserves a note by the copyist that records that the manuscript was copied in Cairo in the year 1511 of the Seleucid era, corresponding to the year 1200 CE.</p>