At this moment, dearest friend, after having closed the letter already, I begin to feel a doubt whether you have received my last letter, which I sent you about eighteen days ago. I am uncertain because you make no mention of its contents, which were—
1. A letter from me to Zigesar.
2. One bar of music (full score), which was to be added at the end of Lohengrin's tale in Act III. (the cut which I want in this scene—omission of the second part of Lohengrin's tale—you also do not mention; I assume that you agree).
3. My asking you to send me a proof of the libretto (now too late).
If you have not received this letter, kindly let me know at once, because in that case I should like to send you the aforementioned additional bar, which might still arrive in time for the general rehearsal.
Source: Project Gutenberg eBook #3835, Correspondence of Wagner and Liszt — Volume 1, No. 38