9 x 5 1/2; 6 1/2 x 5. 1/2; An old copy of a valuable work on arithmetic of which no other copy is known, though a copy of a commentary on it, viz.,  مخائل الملاحة by Muhammad bin Ibrahim (d. A.H. 971 = A.D. 1563) is noticed with a brief description in Paris, No. 2474. A systematic order is not maintained in the work here catalogued, since the work under review is a supplement of ‘Umdat ar Ra’id and an abridgment of Al Hawi, the two preceding compositions of our author on the subject (see preface quoted below.) The contents of the work are as follow: Foll. 2a-14b: باب الضرب; Foll. 14a-19a: باب القسمة; Foll. 19b-25a: باب النسبة; Foll. 25b-29a: 