But the really great work which recent investigation has accomplished has mainly reference, not so much to such details as these, which must always remain more or less matters of speculation, as to the settlement of controversies affecting the topographical questions connected with ancient Jerusalem. First, in regard to points upon which all are now agreed. There is no doubt about the Mount of Olives and the brook Kedron. It is agreed that the Temple stood on the spur immediately west of the Kedron, and that the southern tongue of this spur was called Ophel. It is also agreed that the flat valley west of this spur is that to which Josephus applies the name Tyropæan, though there was a diversity as to the exact course of the valley, which has now been set at rest by the collection of the rock levels within the city. It is also agreed by all authorities that the high southwestern hill, to which the name of Sion has been applied since the fourth century, is that which Josephus calls the upper city, or upper Market Place. The site of the Pool of Siloam is also undisputed, and certain natural features have been determined, which serve as data on which to construct the walls of the ancient city and fix the site and area of the Temple enclosure in the time of Herod. There is still some controversy in regard to the exact position and course of the city walls prior to its destruction by Titus, but this is chiefly maintained by those who are fatally affected in their religious sentiments. There is also a difference of opinion in regard to the area of the Temple building. Practically, however, this point has been settled by the great weight of authority on one side, which affirms that the present Haram enclosure, in which are situated the mosque of Omar, and the sacred stone, represent the area of Herod's Temple, only one or two standing out for a restriction of this area. If the Turkish government would only allow explorations to be made under the platform of the dome of the rock, the very rock upon which Abraham is supposed to have been ordered to sacrifice Isaac, and if the examination of the closed chambers known to exist on the north and east sides of this platform could be carried out, the controversy might be set at rest by actual discovery. Of the Temple of Solomon little is known, though it is possible that the great scarps in the present British cemetery may be as old as the time of David, or the eleventh century before Christ. They are, without doubt, the oldest existing remains in Jerusalem, and formed part of the ramparts of the upper city. Meantime, the most interesting spot which it contains, whether for Jew, Christian, or Mohammedan, is that mysterious dome of the rock, with its gorgeous mosque covering the sacred stone, which Christ himself must have regarded with as much veneration in his day as the adherents of the two other religions, so widely opposed to the one of which he was the founder, do now.