“I have made what I consider to be a very important discovery, viz., an ancient aqueduct, south-east of the south-east corner of the Cœnaculum, and fifty feet above the present aqueduct—I have no doubt the original aqueduct from Solomon’s Pools to the Haram Area. We dug out the earth from a cut stone shaft two feet square, and at sixteen feet was a channel running from the west to the north-east, precisely similar in construction to the passages under the Triple Gate. It varies very much in size. Sometimes we could crawl on hands and knees; then we had to creep sideways; again we lay on our backs and wriggled along; but still it was always large enough for a man of ordinary dimensions. In parts built of masonry, in parts cut out of solid rock, it is generally of a semi-cylindrical shape; but in many parts it has the peculiar shoulders which I have only seen under the Triple Gateway, but which I told you in my last letter had been noticed by Mr. Eaton in the channel leading towards Tekoah. To north-east we traced the channel for 250 feet, until we were stopped by a shaft which was filled with earth; to the west we traced it for 200 feet, till it was stopped in the same manner. In part of this passage we could stand upright, it being ten or twelve feet high, with the remains of two sets of stones for covering, as shown in M. Piazzi Smyth’s work on the Great Pyramid; the stones at the sides being of great size—12 feet by 6. This channel cannot be so late as the Romans. It is evidently of most ancient construction. It is built in little spaces, as if the work had been commenced at two or three points, and had not been directed properly. The plaster is still in good preservation. I shall have the passage cleared out, if possible, as far as the city walls. I presume it goes into the Haram, at a slightly higher level than the present aqueduct. If so, by following it we may arrive at some very interesting conclusions as to the original method of supplying the Temple with water. “This channel must have been of great consequence in olden times, both from the distance it is driven under ground, and from the well-cut shafts which lead to it. I think the question is to be hazarded whether the supply of Jerusalem was not obtained by this aqueduct, which is quite concealed from an enemy.” At the date of the last report the tunnel had been traced about 300 feet to the north-east, where it appears to fall into the present aqueduct. Our second and concluding extract will show the difficulties and dangers attending upon the labours of Lieutenant Warren and his party, as well as the necessity which exists for funds coming in liberally to meet the very heavy expenses of these marvellous explorations. “PROGRESS OF WORKS TO 11TH OCTOBER, 1867.—_Shaft near S.W. angle South Wall of Haram Area._—Depth excavated, to Thursday, the 10th October, 76 feet.