Deprived of sight, every mental faculty was instantly concentrated upon the single sense of hearing. My conductor had left me. There was the sound of a closing door and of padded foot-falls that trailed off into nothingness; then silence. Out of the void came a sharp click as of a well-oiled gun-lock. It was followed by the first notes of a piano-forte accompaniment. A soprano voice began singing Schubert's "Fischermadchen." What a delicious timbre! The clear resonance of a crystal bell. The beautiful melody ceased, but still I seemed to hear the faint, sweet overtones born of its final breath, thin auditory flames that flickered for an instant against the blank wall of the subconscious sense, and then in their turn were gone. Entranced and motionless, I waited. A sudden burst of light flooded the room, the radiation being indirect and proceeding from electroliers sunken behind the ceiling cornice. The apartment was of medium size, evidently the middle one of the ordinary series of three rooms characteristic of New York City houses, and it was furnished most simply--merely a table of Flemish oak with two leather-backed chairs to match and some rugs. The walls and door spaces were hung with red velvet draperies, which contrasted brilliantly with the gorgeous, gold-leafed plastic-work of the cornices and ceiling. A convex mirror, framed in massive silver gilt, hung on the side wall. A second look showed that it was really a bull's-eye of crackled glass, opal-tinted and translucent. It glowed as though illumined by some inward fire (doubtless a concealed electric-light bulb), and the shifting play of iridescent color was exquisitely beautiful. One could compare it only with an imprisoned rainbow. I looked and wondered. "I have kept you waiting. A thousand apologies," said a voice at my back. I turned to face a gentleman who must have entered from the front room; so at least the draperies, still slightly swaying, attested. A tall man, gray-haired, and of an extraordinary thinness--a caricature of Don Quixote himself, if such a thing were possible. "The Lady Allegra," he went on, "is unfortunately indisposed. She begs me to tender her apologies and regrets. I am her ladyship's resident physician, and my name is Gonzales." His eyes, hidden behind smoked glasses, examined me attentively. I murmured some words of conventional regrets, and, truth to tell, I was bitterly disappointed. I turned as though to go. "It is the Lady Allegra's wish that you should dine here this evening," continued Dr. Gonzales. "Solus, it is true, but the disappointment is a mutual one; of that you may be assured." Again I bowed and intimated my willingness to obey.