There are forty- eight of them, and the same number of canons).

What a difference between him and Czerny! Klengel's opus magnum, the "Canons et Fugues dans tons les tons majeurs et mineurs pour le piano, en deux parties," did not appear till 1854, two years after his death, although it had been completed some decades previously.

He carried it about with him on all his travels, unceasingly improving and perfecting it, and may be said to have worked at it for the space of half his life.

The two artists who met at Pixis' house got on well together, unlike as they were in their characters and aims.
Chopin called on Klengel before the latter's departure from Prague, and spent two hours with him in conversation, neither of them being for a moment at a loss for material to talk about.

Klengel gave Chopin a letter of introduction to Morlacchi, the address of which ran: Al ornatissimo Signore Cavaliere Morlacchi, primo maestro della capella Reale, and in which he asked this gentleman to make the bearer acquainted with the musical life of Dresden.