Beethoven asks the Leipzig publisher whether his brother's letter has arrived, mentioning the corrections for Nägeli's edition of op. 31. Beethoven announces that he will send the list of corrections to be published in a few days. The Zurich publisher Hans Georg Nägeli had published the Sonatas op. 31, 1 and 2 in his "Répertoire des Clavecinistes", but there were so many mistakes that Beethoven was bursting with anger and strove for a new edition (which was published by Simrock).
Breitkopf & Härtel were to publish an advertisement in their Allgemeine musikalische Zeitung, drawing attention to the many mistakes in Nägeli's edition. However, this advertisement never apparently appeared.
It was especially this experience with Nägeli that occasioned Beethoven to repeatedly ask Breitkopf & Härtel for proofs of the Variations opp. 34 and 35, as he also suspected they contained mistakes, "as you engraved my variations using my manuscript, I am always afraid that many mistakes might have found their way in, (
) it is an extremely unpleasant thing, particularly for the author, to see an otherwise well-engraved work full of mistakes".
In addition Beethoven wants a change to be made on the title page of op. 35 (he wanted to have his ballet Prometheus op. 43 noted as the origin of the theme). He might even be willing to take over the costs for the re-engraving of the title page.
