Ben-jacob Isaac

Ben-Jacob Isaac a Jewish writer, who died at Wilna, in Poland, July 2, 1863, is best known as the author of a large bibliographical work, entitled Ozar Ha-Sepharim, or Thesaurus Librorum lebraicorum tam Impressorum quam Manuscriptorum (Wilna, 1880, 3 vols.). This work, which has been edited by Wilson, is a very important contribution to Hebrew literature, inasmuch as it contains the titles of 17,000 works, published till the year 1863. Written in Hebrew, the titles are given according to the Hebrew alphabet. For his other writings, see Furst, Bibl. Jud. i, 103 sq. (B. P.)