Note 118 — The Art of Violoncello Playing In the Nineteenth Century.
Isobella S. E. Stigand translation
Fétis contests this, for he says: “The German biographers of Kelz affirm that he (Kelz) was advised by Duport; but this is erroneous, as at this time (1811) Duport was no longer in Berlin.” This could only refer to L. Duport, for his brother remained until his death in the Prussian capital.