Many months before Professor Souchard had entered the Sahara to prepare for their coming. Not that it was his first visit to the Great Desert, however. On the contrary, twenty years of his life had been spent in poking about its endless reaches in search of the ruins of an incredibly ancient city which he had reason to believe had been founded in prehistoric times by colonists from the lost continent of Atlantis, that fabled land in the Atlantic ocean which had been the seat of all civilization and had been swallowed up in a tremendous cataclysm of Nature giving rise to the universal legends of The Flood. Toward the end of his period of explorations, Professor Souchard had come to an oasis lying far from the few known routes, the Oasis of Aiz-Or, inhabited by a small desert tribe. From it he had glimpsed far to the southward the peaks of a mountain range. When he asked the Arabs what mountains lay there, they had replied it was the Land of Shaitun, which in English means Satan. The mountains were accursed said the Arabs, and all who ventured near were never heard of again. At least five days’ travel intervened, said Professor Souchard’s hosts, with no water holes in the direct route, although three small springs bubbling from beneath great rocks lay somewhere between the oasis and the mountain wall. But without guides, a traveller would be unable to find them. Nothing daunted, Professor Souchard accompanied by his faithful companion, Ben Hassim, had set out. For the mountains of Shaitun, he believed, were unknown to geographers. And the ancient Egyptian inscriptions which spoke of the great city of the past for which he had been searching through the years referred to the mountains surrounding it. Perhaps, therefore, the city he sought was within that mountain wall. The scientist and Ben Hassim finally did manage to attain to the foot of the mountain wall, which rose unbroken from the plain, on the fifth day. But their supply of water was exhausted, they were semi-delirious. For two days they travelled along the base of the wall, seeking some pass or valley which pierced the barrier. At length on the seventh day they came upon a stone-paved road and, scarcely able to believe the evidence of their senses, they began to follow along it into the mountains. Before proceeding far, however, they were overcome by fever and thirst and fell insensible. In this condition, they were found and rescued. Upon recovery they found themselves amidst great stone ruins of ponderous architecture, in the midst of a luxuriant valley watered by a broad stream encircling one side, which emerged from a tunnel in the mountains and disappeared again into the mountains, not to reach the surface more. Their rescuers were kindly men, several of whom possessed a good command of English, and they were white. But as Professor Souchard’s knowledge of English was strictly limited, they could not understand each other well.