A book of genealogies intended to outline the historical development of the Oral Law and to establish the chronology of the sages who had transmitted it. This manuscript covers the period of the amoraim. Abraham Zacuto is renowned as an astronomer whose tables were used by Columbus. His work on genealogy has laid the foundations for scholarly research by succeeding generations. Partly in Oriental cursive script and partly in later (17th cent.) Sephardic cursive script. Brown ink. Text is incomplete; fols. 1-149 lacking; dampstaining; several leaves unbound. Binding defective. Sassoon no. 755. Previous owners: Mordechai Zachor; Shelomo ha-Kohen; David Solomon Sassoon.