The Caliph had but few moments to wait before the figure of a man carrying a small bundle crept stealthily up the street and stood at the door. Pressing what looked like the head of a large bolt on the surface of the door, a piece of wood on the inside was slightly raised. On this sign the mute rose, and opening the door just sufficiently wide to allow the man to enter, he closed it quickly, and immediately led the way into the large room where the old man sat by the lamp. The new-comer placed his bundle on the table, and having opened and displayed its contents, which consisted of some jewellery and some pieces of fine cloth, he packed it up again and deposited it with the other packages upon the floor. The old man, who had sat quite motionless, and whose lips did not once move, proceeded to count out certain coins on to the table; these the other took, also apparently in silence, and forthwith departed, leaving the house and passing down the street in the same stealthy and furtive manner in which he had arrived. The Caliph and Giafer remained some time concealed thus in the black shadow of the doorway where they were standing; Giafer being half asleep, and supposing his master to be resting where they were simply because he was tired. The Caliph, however, was watching the proceedings of the old man and his slave. One after another half a dozen visitors arrived, were admitted on giving the same signal, showed the contents of their several bundles, deposited them on the same heap, were paid in silence by the old man, and thereupon went their way. There was no departure from the uniformity of this procedure, excepting that when any one arrived and gave the signal while another was still occupied with the old man, the mute took no notice whatever of the signal, and in every case the man wishing to enter seemed at once to understand why his signal remained unanswered, and waited patiently until the door was opened for the other to depart. The Caliph, who had at first been somewhat puzzled by the strangely conducted traffic which he here observed, had guessed before long that the actual business of this disreputable old merchant was that of purchasing from the thieves, which always infest a large town, whatever plunder they might have to dispose of. There was no haggling as to price. The terms on which the transaction was based were evidently very simple. The thief displayed his wares; the old man paid him what he chose, and clearly the thief, whose market for his ill-gotten goods was likely to be very limited, was satisfied to accept what the buyer chose to award. The Caliph was not ill-pleased to have discovered the nefarious trade which was being here carried on, and determined to have the house closely watched in future, in the hope of thus noting and securing a great number of the most expert and artful thieves in Bagdad.