Determined to be no longer the victim of mystification, I wished JONES good-bye, and hurrying in, found the curtain down. Afraid now to ask what was being played, I waited patiently for the next Act, and when at last the curtain went up, I found to my astonishment that some representation entirely new to me was taking place. Will-o'-the-Wisps on a dark back-ground. That was all I saw. I asked myself whether I had gone mad, or whether the Drury Lane Pantomime was being played a little earlier than usual. Then the dark scene gave place to a scene of great brilliancy. There was a throne at the back of the stage, and again my thoughts reverted to the _Huguenots_, and I fancied I could recognise _Queen Margaret_. But her features were not the features of ELLA RUSSELL. Besides, ELLA RUSSELL does not dance, not at least on the Operatic stage; and this lady did. "This is HELEN," said a gentleman in a stall on my right to a lady by his side. Here was at least a clue; and when at the same moment the baritone DE RESZKE stepped out of a group attired in the garb of _Mephistopheles_, I said to myself that the performance had been changed, and this was the last Act of BOÏTO'S _Mefistofele_, with new details, or at least details that I had not noticed when the work was performed at Her Majesty's Theatre and at Covent Garden. Now dancing began in earnest, and I wondered much at the never-failing ingenuity of Mr. AUGUSTUS HARRIS, who with a score of first-rate singers in his Company, had nevertheless found himself compelled (probably at five minutes' notice,) to change an Opera into a _ballet_. It reminded me of a certain operatic Manager, who, being suddenly deprived of the services of most of his vocalists, announced in his programme, that in consequence of the departure of his principal singers, the music of _Don Giovanni_, would be "replaced, for that night only, by lively and expressive pantomime." When, however, _Mephistopheles_ DE RESZKE and _Faust_ DE RESZKE both began to sing, I saw that my supposition was untenable. "What you have seen," said JONES, who meanwhile had come in, and who now occupied a seat on my left, "is not _Mefistofele_ at all. It is GOUNOD'S additional Ballet Scene for _Faust_. 'Dramatic _Divertissement_' it ought to be called. Beautiful grouping, picturesque costumes, magnificent scenery, delightful dance music! But you ought not to have missed the new _Valentine_. That was a great mistake." I looked at my watch. "Time enough for the new _Valentine_ even now," I reflected; and I went over as fast as I could to Covent Garden.