While practising these duets with Eck, I became first aware that my teacher, like many violinists of the French school, was no thoroughly finished artist; for however excellently he executed his concertos, and some other compositions studied with his brother, yet he knew but little how to enter into the spirit of the works of others. A change of characters would have been very possible while playing these duets, for a scholar could have taught the master how they ought to have been executed.