"How are you, my dear POTSON?" he began. "What? not well? Dear me, dear me, what can it mean? And yet I don't think it can have been the fifth glass of sherbet which you took with the fourteenth wife of the KHAN. No, I don't think it can have been that." "HOLES, you extraordinary creature," I broke in; "what on earth made you think that I drank five glasses of sherbert with the KHAN'S fourteenth wife?" "Nothing simpler, my dear fellow. Just before I saw you a native Bokharan goose ran past this rock, making, as it passed, a strange hissing noise, exactly like the noise made by sherbert when immersed in water. Five minutes elapsed, and then you appeared. I watched you carefully. Your lips moved, as lips move only when they pronounce the word fourteen. You then smiled and scratched your face, from which I immediately concluded you were thinking of a wife or wives. Do you follow me?" "Yes, I do, perfectly," I answered, overjoyed to be able to say so without deviating from the truth; for in following his reasoning I did not admit its accuracy. As to that I said nothing, for I had drunk sherbert with no one, and consequently had not taken five glasses with the fourteenth wife of the KHAN. Still, it was a glorious piece of guess-work on the part of my matchless friend, and I expressed my admiration for his powers in no measured terms. "Perhaps," said HOLES, after a pause, "you are wondering why I am here. I will tell you. You know Lady HILDA CARDAMUMS?" "What, the third and loveliest daughter of the Marquis of SASSAFRAS?" "The same. Two days ago she left her boudoir at Sassafras Court, saying that she would return in a quarter of an hour. A quarter of an hour elapsed, the Lady HILDA was still absent. The whole household was plunged in grief, and every kind of surmise was indulged in to account for the lovely girl's disappearance. Under these circumstances the Marquis sent for me, and that," said HOLES, "is why I am here." "But," I ventured to remark, "do you really expect to find Lady HILDA here in Bokhara, on these inhospitable precipices, where even the wandering Bactrian finds his footing insecure? Surely it cannot be that you have tracked the Lady HILDA hither?" "Tush," said HOLES, smiling in spite of himself at my vehemence. "Why should she not be here? Listen. She was not at Sassafras Court. Therefore, she must have been outside Sassafras Court. Now in Bokhara _is_ outside Sassafras Court, or, to put it algebraically, in Bokhara = outside Sassafras Court. Substitute 'in Bokhara' for 'outside Sassafras Court,' and you get this result-- 'She must have been in Bokhara.' Do you see any flaw in my reasoning?" For a moment I was unable to answer. The boldness and originality of this master-mind had as usual taken my breath away. HOLES observed my emotion with sympathy.