In 1828 he went to Paris with the assistance of the young poet Michael Beer, the brother of Meyerbeer. Here also, as in Berlin, he at first supported himself by tutoring, among his pupils being the young brothers Alphonse and Gustave de Rothschild. In 1838 he was appointed cataloguer of Hebrew, Chaldaic, Syriac, and Arabic manuscripts in the Bibliothèque Nationale de Paris.
