So conspicuous are these two rivers that we almost need to remind ourselves that they are not the only waters of Israel. There are several perennial streams in Syria, of which something will be said presently; but the list of these by no means exhausts the stores of water in the land. Great stretches of the country are apparently waterless, especially in the south, and yet water is almost everywhere, underground. In many parts the soil and surface-rock are soft, lying on a hard bed-rock at various depths below. Accordingly we find that one of the most mysterious and characteristic features of the south country is its underground waters.[9] Springs and streamlets find their way through fissures or filter through porous stone to the harder rock below, and flow along subterranean channels there. Zangwill quotes an older authority for the somewhat startling statement that “the entire plain of Sharon seems to cover a vast subterranean river, and this inexhaustible source of wealth underlies the whole territory of the Philistines.” Putting the ear to any crack in the sunburnt clay of the surface, in certain parts, one may hear the subdued growl and murmur of the waters underneath. Trees flourish in places where there is no water apparent, their roots bathing in unseen streams, and drawing life and freshness from them. One can well understand the feelings of awe with which primitive people regarded these mysterious nether springs. They did not connect them with the idea of rain from above, as modern science does, but believed that they had forced their way up from “the Great Deep,” which was supposed to underlie the earth, and into which the roots of the mountains were thrust far down like gigantic anchors of the world. Some of the rivers of Damascus are also underground, “and may often be seen and heard through holes in the surface.”[10] Jerusalem is a waterless city, whose famous pools are tanks for rain-water. Its one spring is that strange intermittent one which overflows from the Well of the Virgin through Hezekiah’s aqueduct to the Pool of Siloam. Yet there are legends that beneath the sacred rock which the mosque of Omar covers there is a subterranean torrent; and that the rushing of hidden waters has been heard at times below the massive stones of the Damascus Gate of the city.