As Oqua ceased speaking, the Sea Rover arose to the surface by the side of the Silver King, the hatches were opened, and in a few minutes we were welcomed on board the electric yacht by Captain Thorfin, and invited to an elegant supper. The day had certainly been most agreeably spent but its lessons were too suggestive and far-reaching in their character to be adequately presented in this small volume. I was fatigued by the incessant activity since early morning and was glad of an opportunity to retire to my state-room and rest. I was awake early next morning and after a hearty breakfast, we were soon speeding down the Cocytas between two lofty walls of granite. There was nothing to be seen but these towering cliffs for the first few miles and Captain Thorfin gave us a specimen of the speed of the Silver King. The cliffs seemed to dart past us as if we were on board of a lightning express train, and yet we could scarcely feel the motion of the vessel. I confess that I felt a little nervous at such astonishing speed, but Captain Thorfin assured us that there was no danger, as the submarine patrols removed every obstruction and preserved a uniform depth of water. I asked the Captain what was the greatest speed of his vessel and he replied that he had never tested it. He had made one hundred miles an hour but the excursionists generally preferred to travel slowly. On this trip we would average fifty, and so reach Kroy in about three hours. During the last two hours of our journey we were passing through a densely populated country. Great communal homes appeared on either side and large manufacturing plants at frequent intervals. But our interest was centered at the mouth of the river and our attention was chiefly directed over the bow. Soon a point of land appeared where the river seemed to part in twain. This I recognized as the island I had seen from the airship which had brought us to the continent, and here is where the city of Kroy had been situated. My interest had been aroused and as the Silver King turned into the northern channel, the island became the center of attraction. On the larboard side the same scenes of sylvan beauty, palatial buildings and groups of happy, joyous people continued, but it was now the uninhabited island that absorbed my attention. I could see, in places, through the tangled brushwood and tall trees which lined the shore, glimpses of shattered walls and tumuli, over-run by vines and briers, such as in many parts of the outer world are so attractive to archeologists, as the ruins of some ancient civilization. At one point I noticed what appeared to have been costly monuments to the dead and I said to Norrena: "Surely that must have been a cemetery."