And so you did not come, dearest Franz! Without a word of explanation to me—simply, silently, did not come! [...] Hans and Cosima have grown very dear to me. I am very melancholy at seeing them leave me to-day. [...]
They are taking with them a transcript of Tristan which I have been writing while he was here. [...]
Source: Letters of Richard Wagner, Vol. 1, selected and ed. Wilhelm Altmann, trans. M. M. Bozman (J. M. Dent & Sons, 1927), No. 340