On entering, he had placed his walking stick on the table in the middle of the room. He turned to get it, and as he did so he took from his pocket a small housewife. His multitudinous experiences had taught him the advisability of carrying such an article about with him, and on this occasion it promised to prove more than ordinarily useful. From one compartment he selected a long, stout needle which he placed in a hole in the handle of the walking stick. Then returning once more to the window, and leaning well out, he probed for the cigarette lying so snugly five or six feet below him. Twice he was unsuccessful, but the third attempt brought the precious relic to his hand. Taking it to the table, he drew up a chair and sat down to examine it. It was sodden and discoloured, but the rim of the gutter had in a measure protected it, and it still held together. His famous magnifying glass was again brought into action. Once upon a time there had been printing on the paper, but now it was well-nigh undecipherable. As I have already remarked, however, Burrell was a man gifted with rare patience, and after a scrutiny that lasted some minutes, he was able to make out sufficient of the printing to know that the maker’s name ended with “olous,” while the place in which the cigarette had been manufactured was _Cairo_. “I wonder,” said the detective to himself, “if this is destined to be of any service to me. At first glance it would appear as if my first impression was a wrong one. Mr. Henderson, who is accused of the murder, has lately returned from Cairo. Though, perhaps he never purchased any tobacco there, it would certainly do him no good to have it produced as evidence, that the butt end of a cigarette from that place was found in the gutter outside the window of the murdered woman’s room.” After another prolonged inspection of the room, and not until he had quite convinced himself that there was nothing more to be discovered in it, he descended to the lower regions of the house, returned the key to the landlord, and immediately left the building. Crossing the street, he made his way to the house opposite. The caretaker received him, and inquired the nature of his business. He gave his explanation, but a few questions were sufficient to convince him that he must not expect to receive any assistance from that quarter. The rooms, so he discovered, from which it would have been possible to catch any glimpse of what was going on in Teresina’s apartment in the opposite house, were tenanted only in the daytime. “Nothing to be learned there,” said Burrell to himself, when he had thanked the man and had left the house. “Now the question to be decided is, what shall I do next?”