No less valuable are his works relating to the history of the Jewish community of Berlin, parts of which have been incorporated in Ludwig Geiger's "" (ib. 1871); other portions have been published in Die Gegenwart (ib.
His contributions to the study of the Jewish community in Berlin are equally important, with some of his works incorporated into Ludwig Geiger's "" (published in 1871), while others were published in Die Gegenwart.