<p style='text-align: justify;'>Passage from ʿAlī ibn ʿĪsā, Taḏkirat al-kaḥḥālīn (‘Memorandum for opticians’), first discourse, chapters 13-14 and 17-18, dealing with arachnoid, watery humour, conjunctivae and the muscles of the eye (ed. Hyderabad 1964, pp. 25-26, 30-31).</p>