Jäger had two sons who were educated as violoncellists under his direction. The elder, JOHANN ZACHARIAS LEONHARD, born 1777, at Anspach, showed an early development and was able, even at nine years of age, to execute solos with rapidity, certainty, and accuracy. In 1787 he played at the Prussian Court, and on that occasion so greatly excited the admiration of the Queen that she wished to acquire him for the Royal band in Berlin, to which, however, the father of the boy would not yield on account of his youth. The Queen, therefore, proved her interest in him by granting him a life-long pension of 100 thalers. On his return home the Margrave of Anspach appointed him his chamber musician. He did not, however, remain long in this position, and went with his father to Breslaw. There Jäger’s younger son was born, whose christian name was Ernst. He possessed even more talent than his brother, for it was not long before he overtook him in cello playing, to which the instructions he received from Bernhard Romberg greatly contributed. Until the year 1825 he lived at Breslaw, after having travelled through a great part of Germany and Hungary. Then he responded to a summons from the Bavarian Court to go as solo cellist to Munich. Besides his two sons, Johann Jäger educated also ALEXANDER UBER, born at Breslaw, 1783, as a capable violoncellist. His father, by profession a solicitor, was an enthusiastic lover of music, occupied his leisure hours with the composition of chamber music, and instituted weekly two concerts in his house. At one of them symphonies were produced, at the other quartets and quintets. At the beginning of our century, Carl Maria v. Weber, who began his career at the Breslaw Theatre, took part in these musical entertainments, as did also the Director of music in the University at Berne and the piano player Klingohr. The intercourse with these men was not of less importance for the musical development of young Uber than his musical life in his father’s house. At first he enjoyed the violin instruction of Jannizeck, while Schnabel conducted his theoretical studies. But he very soon took up the violoncello, for which Jäger was his teacher. In the year 1804 he undertook his first tour, but returned soon to Breslaw. In the course of time Uber filled many positions as Kapellmeister, until about 1820 he settled at Basle, where he was married. In 1823 he undertook the post of Conductor with the Count of Schönaich and Prince von Karolath, but, in the following year, death carried him off. Of his compositions for the violoncello, Uber published a Concerto (Op. 12), Variations with Quartet accompaniment (Op. 14), Six Caprices (Op. 10), and Sixteen Variations upon a German air.