Besides, our height was so great that notwithstanding the numbers of the squadron, we could not easily be seen from the surface of the planet, and if seen at all we might be mistaken for high-flying birds. Mars Passes Below Us. Here we remained then through the entire course of twenty-four hours and saw in succession as they passed from night into day beneath our feet the land of Chryse, the great continent of Tharsis, the curious region of intersecting canals which puzzled astronomers on the earth had named the "Gordian Knot," the continental lands of Memnonia, Amazonia and Aeolia, the mysterious centre where hundreds of vast canals came together from every direction, called the Trivium Charontis; the vast circle of Elysium, a thousand miles across, and completely surrounded by a broad green canal; the continent of Libya, which, as I remembered, had been half covered by a tremendous inundation whose effects were visible from the earth in the year 1889, and finally the long, dark sea of the Syrtis Major, lying directly south of the land of Hellas. The excitement and interest which we all experienced were so great that not one of us took a wink of sleep during the entire twenty-four hours of our marvellous watch. There are one or two things of special interest amid the multitude of wonderful observations that we made which I must mention here on account of their connection with the important events that followed soon after. Just west of the land of Chryse we saw the smaller land of Ophir, in the midst of which is a singular spot called the Juventae Fons, and this Fountain of Youth, as our astronomers, by a sort of prophetic inspiration, had named it, proved later to be one of the most incredible marvels on the planet Mars. Further to the west, and north from the great continent of Tharsis, we beheld the immense oval-shaped land of Thaumasia containing in its centre the celebrated "Lake of the Sun," a circular body of water not less than 500 miles in diameter, with dozens of great canals running away from it like the spokes of a wheel in every direction, thus connecting it with the ocean which surrounds it on the south and east, and with the still larger canals that encircle it toward the north and west. This Lake of the Sun came to play a great part in our subsequent adventures. It was evident to us from the beginning that it was the chief centre of population on the planet. It lies in latitude 25 degrees South and longitude about 90 degrees west. Completing the Circuit. Having completed the circuit of the Martian globe, we were moved by the same feeling which every discoverer of new lands experiences, and immediately returned to our original place above the land of Hellas, because since that was the first part of Mars that we had seen, we felt a greater degree of familiarity with it than with any other portion of the planet, and there, in a certain sense, we felt "at home."