Two volumes ( جزءان ) of an extensive treatise on astrological interrogations by Abū Yūsuf Ya‘qūb ibn ‘Alī al- Qarshī al-Qaṣrānī ( أبو يوسف يعقوب بن علي القرشي القصراني , fl. late 9th century).
Both volumes were copied in Mamluk Egypt, the title pages of the volumes label them as Volume One and Volume Two, and the beginning of the treatise is found in Volume One and the end in Volume Two. Two facts, however, make it clear that the two volumes did not originally form a single set. First, volume One was copied in 768/1367 and Volume Two was copied over a century earlier in 640/1243. Second, the colophon of Volume One states that the subsequent volume will begin with Chapter Seven: The Matter of the Two Opponents ( الباب السابع في أمر الخصمين ), but this chapter begins at the foot of f. 20r of Volume Two. The first 20 folios of Volume Two repeat text already found in Volume One. The volumes contain numerous diagrams, mostly horoscopes.