The supposition, however, is rendered uncertain by a statement of Isaiah (viii. 6). While Ahaz, the father of Hezekiah, was still reigning, Isaiah uttered a prophecy in which he made allusion to “the waters of Shiloah that go softly.” Now this can hardly refer to anything else than the gently flowing stream which still runs through the tunnel of Siloam. In this case the conduit would have been in existence before the time of Hezekiah; and, since we know of no earlier period when a great engineering work of the kind could have been executed until we go back to the reign of Solomon, it is possible that the inscription may actually be of this ancient date. The inference is supported by the name Shiloah, which probably means “the tunnel,” and would have been given to the locality in consequence of the conduit which here pierced the rock. It was not likely that when David and Solomon were fortifying Jerusalem, and employing Phœnician architects upon great public buildings there, they would have allowed the city to depend wholly upon rain cisterns for its water supply. Since the inscription calls the Pool of Siloam simply “the Pool,” we may perhaps infer that no other reservoir of the kind was in existence at the time; and yet in the age of Isaiah, as we learn from Isa. xxii. 9, 11, there was not only “a lower pool,” in contradistinction to “an upper one,” but also “an old pool,” in contradistinction to a new one. As Dr. Guthe’s excavations have laid bare the remains of four such pools in the neighbourhood of that of Siloam, there is no difficulty in finding places for all these reservoirs. But they could hardly have existed when the Pool of Siloam was still known as simply “the Pool,” nor could the name of Shiloah have well been given to the locality if another tunnel, observed by Sir Charles Warren on the eastern side of the Temple Hill, had been already excavated. This second tunnel starts, like the Siloam one, from the Virgin’s Spring, and was designed to bring the water of the spring within the walls of the city. A shaft is cut for seventy feet into the hill, where it meets another perpendicular shaft, which rises for a height of fifty feet, and then meets a flight of steps, which lead into a broad passage, ending in another flight of steps and a vaulted chamber. Niches for lamps were found here at intervals, intended to light the persons who went to draw the water by means of a bucket. As lamps of the Roman period were discovered in the chamber, the tunnel must have been known and used up to the time of the capture of Jerusalem by Titus, and it is probably not older than the reign of Herod. In any case, the comparative excellence of its workmanship goes to show that it was made at a later date than the tunnel of Siloam.