Mon cher Maître:
Niemann is indisposed, which compels us to change tomorrow's performance; it will thus be impossible for us to leave the theater. Mr. Boyer wants me to tell you that Mr. Vauthrot and Mr. Dietsch will be in his office at two-thirty with the score, and he requests that you be kind enough to come there. I shall be there myself, and if there are any changes to be made we shall all be there to listen to you and no time will be lost.
I remain your devoted
E. Cormon
Source: Letters of Richard Wagner: The Burrell Collection, ed. John N. Burk (Macmillan, 1950), No. 234