The old writers, however, made up their minds that the pigeon found its way by scent, which sense alone, according to their ideas, could guide it across the sea. They were not aware of the power possessed by birds of making their eyes telescopic at will, or of the enormous increase of range which the sight obtains by elevation. A pigeon at the elevation of several hundred yards can see to an astonishing distance, and there is no need of imagining one sense to receive a peculiar development when the ordinary powers of another are sufficient to obtain the object. That dove-cotes were in use among the earlier Jews is well known. An allusion to the custom of keeping pigeons in cotes is seen in Isa. lx. 8: "Who are these that fly as a cloud, and as the doves to their windows?" or, as the Jewish Bible translates the passage, "as the doves to their apertures?" In this passage the sacred writer utters a prophecy concerning the coming of the world to the Messiah, the Gentiles flocking to Him as the clouds of pigeons fly homeward to their cotes. [Illustration: BLUE ROCK PIGEONS.] The practice of pigeon-keeping has survived to the present day, the houses of wealthy men being furnished with separate pigeon-houses for the protection and shelter of these popular birds. In the Holy Land are found all the species of Pigeons with which we are familiar, together with one or two others. First, there is the Rock Pigeon, or Blue Rock Dove, which is acknowledged to be the origin of our domestic breeds of Pigeons, with all their infinite variety of colour and plumage. This species, though plentiful in Palestine, is not spread over the whole of the land, but lives chiefly on the coast and in the higher parts of the country. In these places it multiplies in amazing numbers, its increase being almost wholly unchecked by man, on account of the inaccessible cliffs in which it lays its eggs and nurtures its young, its only enemies being a few of the birds and beasts of prey, which can exercise but a trifling influence on these prolific birds. Mr. Tristram, while visiting the Wady (or Valley) Seimûn, which lies near the Lake of Gennesaret, witnessed an amusing example of the vast number of these Pigeons. "No description can give an adequate idea of the myriads of rock pigeons. In absolute clouds they dashed to and fro in the ravine, whirling round with a rush and a whirr that could be felt like a gust of wind. It was amusing to watch them upset the dignity and the equilibrium of the majestic griffon as they swept past him. This enormous bird, quietly sailing along, was quite turned on his back by the sudden rush of wings and wind." In Palestine these birds are taken in nets, into which they are decoyed by a very effective though cruel device.