On the east side of Jerusalem runs the deep Kedron gorge; under the Temple walls on its western slope a rock chamber contains the one spring of Jerusalem, known as the Virgin’s Fountain to Christians, and as the “Mother of Steps” to Moslems, because of the stairs which lead down into the vault from the present surface of the valley, as raised by the accumulated rubbish of twenty-five centuries of stormy history. This spring, with its intermittent rush of waters welling up under the steps, is the En Rogel of the Old Testament, and I believe the Bethesda or “House of the Stream,” the troubling of whose waters is mentioned in the fourth Gospel. From the back of the rock chamber a passage, also rock-cut, and scarcely large enough in places for a grown man to squeeze through, runs south under the Ophel hill for about a third of a mile, to the reservoir which is the undisputed site of the ancient Pool of Siloam. The course of the channel is serpentine, and the farther end near the Pool of Siloam enlarges into a passage of considerable height. Down this channel the waters of the spring rush to the pool whenever the sudden flow takes place. In autumn there is an interval of several days; in winter the sudden flow takes place sometimes twice in a day. A natural syphon from an underground basin accounts for this flow, as also for that of the “Sabbatic river” in North Syria. When it occurs, the narrow parts of the passage are filled to the roof with water.
This passage was explored by Dr. Robinson, Sir Charles Wilson, Sir Charles Warren, and others, but the inscription on the rock close to the mouth of the tunnel was not seen, being then under water. When it was found in 1880 by a boy who entered from the Siloam end of the passage, it was almost obliterated by the deposit of lime crystals on the letters. Professor Sayce, then in Palestine, made a copy, and was able to find out the general meaning of the text. In 1881 Dr. Guthe, a German explorer, cleaned the text with a weak acid solution, and I was then able, with the aid of Lieutenant Mantell, R.E., to take a proper “squeeze.” It was a work of labour and requiring patience, for on two occasions we sat for three or four hours cramped up in the water in order to obtain a perfect copy of every letter, and afterwards to verify these copies by examining each letter with the candle placed so as to throw the light from right, left, top and bottom. Only by such labour can reliable copies be made. We were rewarded by sending home the first accurate copy published in Europe, and were able to settle many disputed points raised by the imperfect copy of the text before it was cleaned. An excellent cast was afterwards made.