See the interesting account in Wagner's Reminiscences of schnorr von Carolsfeld in his collected works, viii.
"Wagner's Tristan und Isolde"
George Ainslie Hight
Long afterward Wagner's friend, schnorr von Carolsfeld, saw the score in the hands of the composer.
"A Second Book of Operas"
Henry Edward Krehbiel
It is just as likely as not that the next schnorr or Schroder may arise in England.
"The Perfect Wagnerite A Commentary on the Niblung's Ring"
George Bernard Shaw