245. Fāʼidah fī kayfīyat ikhrāj al-qīrāṭ min al-ʻadad alladhī ṣaḥḥat minhu al-masʼalah min ayy ʻadad kāna
248. A fāʼidah purporting to have been transmitted by Ṭūsī, who discovered it written on a copy of ?al-Zīj al-ʻalāʼī, with (below) a note from ?Zīj al-iqbāl.