"And are you the only tenant of this house?" inquired the Earl; "for I presume that the bed-chamber in which poor Thomas lies is not your own."

"No: some old man occasionally visits the house, and now and then sleeps in that room," returned the physician. "But I have only seen him once or twice and do not even know his name. I have my own key for the front-door, and I am acquainted with the secret of the subterranean passage; but I never hold any communication with Tidmarsh, beyond paying him the rent when it is due;—and when I happen to meet the old man I have alluded to, we merely exchange a word and pass on. He has his rooms in the house, and I have mine; and as he does not interfere with me, I never trouble myself about him nor his concerns."

"Then, for aught you know, doctor," said the Earl, "you may occupy an apartment in the house of bad characters?"

"What do I care?" exclaimed Lascelles. "I could not well have such a laboratory as this at my own residence—my servants would talk about these human heads, and those plaster casts, and the galvanic experiments, and I should be looked upon as a sorcerer, or at all events with so much suspicion and aversion as to lose all my practice. And, by the bye, my dear Earl, you should be the very last," added the doctor, with a smile, "to hint at the possibility of this house being connected with bad characters; for had I not a laboratory in so quiet a street—a street, too, where no questions are ever asked nor observations made—your poor brother might have waited long enough for the chance of resuscitation by galvanic means."

"True, my dear doctor—I was unjust," said the Earl. "But you will forgive me?"

"Say no more about it, Arthur. Were men of scientific research to be over particular, they might as well abandon their studies at once. The experiments I have made on corpses in this room, could scarcely have been performed at my own residence; and, to tell you very candidly, I believe that the old man who has the other apartments on this floor, is either a miser or a rogue;—but I care nothing about him or his affairs. And now I will mention to you one very extraordinary circumstance. It must have been, as near as I can guess, five weeks ago that I was one night pursuing my galvanic experiments in this room—I had been operating on divers rabbits, frogs, and rats—and, may be, for anything I recollect, a few cats,—when I was compelled to go down stairs for a particular purpose. On my return, as I came back by that door," he continued, pointing to one at the farther end of the room, "and which leads to the staircase, I was startled—nay, positively astounded at seeing a man standing near this cupboard, and gazing fixedly on the human heads. I confess I was alarmed at the moment, because I had heard voices in the house during the half-hour previously; and I remember that I rushed back and instinctively barred and bolted the door. But the man turned round before I had time to close the door—and I caught a glimpse of his face. That man—now who do you think he was?"

"It is impossible to guess, doctor," said the Earl.

"He was your half-brother, who now lies in the adjoining room!" added Lascelles.

"Thomas!—here!" cried Arthur, profoundly surprised.

"I could not possibly make a mistake, because I had seen him before—no matter how or where—and knew him immediately," continued the physician. "Well, I must confess that I was uncertain how to act. I did not wish him to recognise me—although perhaps he had already done so; and I could not very well leave the house and return to Grafton-street at once, because I had on a dressing-gown, and had left my coat in this room. I was half-way down the stairs leading to the hall, when I heard some one opening the front door with a key. Knowing that it must be either the old man I have before mentioned, or Tidmarsh, as they alone besides myself had keys of the front door, I waited till the person came in; and it was Tidmarsh. I immediately told him what I had seen.—'Ah!' said he, 'I suspected there was something wrong, and that made me get up, dress, and come round.'—His words astonished me; and I requested an explanation; but he seemed sorry that he had uttered them inadvertently, and gave some evasive reply. He however accompanied me up stairs: we entered the laboratory, and no one was there. We went into the next room—the one where Rainford is now sleeping—and there we found the carpet moved away from the trap-door——"