The little girl, who is in her twelfth year, will play the most difficult compositions of the greatest masters; the boy, who is not yet seven, will perform on the clavecin or harpsichord; he will also play a concerto for the violin, and will accompany symphonies on the clavier, the manual or keyboard being covered with a cloth, with as much facility as if he could see the keys; he will instantly name all notes played at a distance, whether singly or in chords on the clavier, or on any other instrument, bell, glass, or clock. He will finally, both on the harpsichord and the organ, improvise as long as may be desired and in any key, thus proving that he is as thoroughly acquainted with the one instrument as with the other, great as is the difference between them.[20018] Here, too, Goethe heard him. "I saw him as a boy, seven years old," he told Eckermann, "when he gave a concert on one of his tours. I myself was fourteen, and I remember the little fellow distinctly with his powdered wig and his sword."[20019] At Coblenz, Mozart was presented to the Elector of Treves, Johann Philipp (von Walderdorf), by Baron Walderdorf and the Imperial Ambassador, Count Bergen, and appeared at court on September 18. He was also frequently invited by the Privy Councillor and Imperial Knight von Kerpen, whose seven sons and two daughters all either sang or played some instrument. At Bonn, the Elector of Cologne, Maximilian Freidrich (Count of Konigseck-Rothenfels), being absent, they only remained long enough to see and admire the splendours of the residential palace; the magnificent beds, the baths, the picture galleries, concert halls, decorations, inlaid tables, chairs, &c.; also the numerous curiosities at Poppelsdorf and Falkenlust. At Cologne, on the other hand, they only note the "dingy cathedral." At Aix, the Princess Amalie, sister {EARLY JOURNEYS.} (34) to Frederick the Great, and a zealous lover and patroness of music, was taking the waters. She endeavoured to persuade L. Mozart to take his children to Berlin, but he would not alter his plans. "She has no money," writes the practical man. "If the kisses she bestows on my children, particularly on Master Wolfgang, were each a louis d'or, we should be well off; as it is, neither our hotel bill nor our post-horses can be paid with kisses." At Brussels, where Prince Charles of Lorraine, brother of the Emperor Francis I., resided as Governor and Captain-General of the Austrian Netherlands, they were delayed some time, but succeeded in giving a grand concert.