Sylvester required immediate attention, for he was white and bloodless as a vampire’s victim, and his pulse-beats were very slow and so feeble as to be almost indetectable. His clothing was removed and he was stretched on an improvised operating-table. It was now seen that the portions of his limbs and trunk in which the suckers had implanted themselves were horribly swollen and discolored; and this swelling rendered the task of removal all the more difficult. There was nothing to do but cut the suckers out; and after the administration of an opiate, which seemed scarcely needful under the circumstances, the operation was performed by Dr. Adams, the physician of the party. It was evident that Sylvester had been dreadfully poisoned by the suckers, for even after their removal, the flesh in which they had sunk continued to swell, and soon turned to a putrescent black which threatened to involve his whole body. At no time did he recover full consciousness, though during the night after the explorers’ return, he began to toss and mutter weakly in a sort of low delirium, which presently merged into a coma from which he did not awaken. At ten the next morning, Dr. Adams announced that Sylvester was dead. It was necessary to inter him at once, for his body presented the appearance and all the usual characteristics of a week-old corpse.

A sense of ominous gloom and oppression was thrown over the whole party by the chemist’s fate, but it was of course felt that nothing should be permitted to delay, or interfere with, the work of investigation that had been undertaken. No sooner had the unfortunate Sylvester been laid to rest in a hurried grave amid the Saharan sands, when his fellow-scientists began eagerly their examination of the specimens they had secured. These were all studied under powerful microscopes and were subjected to chemical analysis of the most searching and rigorous order. Many known constituents were found, but all of these were immingled with elements for which chemistry had no names. The molecular formation of the crystals was more intricate than that of any substance known on earth; and the metals were heavier than anything so far discovered. The cellular composition of the two plant-forms was oddly similar to that of animal bodies, and it was readily ascertained that they were intermediate between the animal and vegetable kingdoms, partaking of the character of both. How such minerals and plants could have appeared suddenly, in a location so obviously impossible even for the fostering of normal forms, was a theme of endless argument and inconclusive surmise between Lapham and his confreres. For awhile, no one could propound a theory that seemed at all plausible or credible. Apart from everything else, they were puzzled by the zone of fine dust about the changed area: this zone was found to consist of sand-particles whose very molecules had been partially broken up and disintegrated.

“It looks,” said Lapham, “as if someone or something had blown up all the atoms in this part of the Sahara, and had then started a totally new process of re-integration and evolution, with the development of soil, water, minerals, atmosphere and plants such as could never have existed on the earth during any of its geological epochs.”

This startling theory was discussed pro and con, and was finally adopted as the only explanation that contained elements of possibility. But it remained to determine the agency of the geological and evolutionary changes; and of course no one could propound anything decisive as to the nature of the agency. The whole thing was enough to stagger the imagination of a Jules Verne; and with scientists of such indubitable rectitude as Lapham and his fellows, the fantasies of lawless imagination had no place. They were concerned only with things that could be verified and proven according to natural laws.

Several days were devoted to analyzing, re-analyzing and theorizing. Then a report of the conditions that had been found was drawn up, and it was decided to send a summary of this report by radio to Europe and America. An attempt to use the radios carried by the party revealed a peculiar condition of absolute static that prevailed above the vapor-covered region. No messages could be sent or received across this region, though communication was readily established with points that were not in a direct line with the new area, such as Rome, Cairo, Petrograd, Havana and New Orleans. This condition of static was permanent—at least, many repeated efforts, at all hours of the day and night, were utterly ineffectual. One of the planes, carrying a radio-apparatus, soared to a height of nine thousand feet above the encampment, and sought to establish the desired connection, but in vain. It was necessary for the plane to cross the whole cloud-mass, to the northern side, before New York and London could receive and return its messages.

“It would seem,” observed Lapham, “as if some sort of ultra-powerful cosmic ray, that prevents the passage of radio vibrations, had been turned on this part of the Sahara. Evidently there is a screen of interfering force.”

While arguments as to the validity of this theory, the nature and origin of the conjectural rays, and their possible relation to the geologic changes, were still in progress, two members of the party complained of feeling ill. Both of them, on examination by Dr. Adams, were discovered to be afflicted with cutaneous symptoms resembling those that had been developed by many of the caravan from Timbuctoo. The characteristic patches of bright green, with purplish borders, were spreading rapidly on their arms and shoulders, and soon invaded the exposed portions of the skin. The two men became mildly delirious within a few hours, and gave evidence of extreme nervous depression. Simultaneously with this turn of their illness, Dr. Adams himself grew conscious of a sudden feeling of indisposition. Obviously, the insulative clothing worn by the explorers had been inadequate for their protection against whatever lethal forces were inherent in the new soil, minerals and vapor-laden atmosphere. It was decided that the party must return to civilization immediately, before others should be stricken.

Camp was broken up, and the two planes were headed for Great Britain. During the brief journey, all of the scientists began to fall ill, and the pilot of one of the planes collapsed, allowing the controlless air-vessel to plunge into the Atlantic near the coast of Spain. The crew of the second plane, seeing the accident, flew gallantly to the rescue, and succeeded in saving Lapham and Dr. Adams, who were struggling in the waters. Their companions, including the sick pilot, were all drowned. It was a sad remnant of the expedition which landed at the London airport several hours later.

III

In the meanwhile, the summary of the explorers’ report, dispatched with so much difficulty by radio, had been published in all the leading dailies of the world and had aroused universal interest amid the scientific fraternity. The press was full of theories and conjectures, some of them extremely wild and fantastic. One journal went so far as to insinuate that the Saharan manifestations were part of a plan for world-dominion that was being put into practice by the United Oriental Federation, which then included China, Indo-China, Burma, and Japan; and others were inclined to name Germany as the instigator.

On the very same day when Lapham and his companions reached London, there came from the United States the news of a terrible and mysterious cataclysm, which had occurred in Missouri and which had involved at least half of this state. Though the time was still mid-winter and the ground was covered with unmelting snow, a tremendous storm of dust had appeared, in which many towns and cities, including St. Louis, had been utterly swallowed up. All communications with these towns and cities had been cut off, and no message, no living thing nor evidence of life, had come forth from the storm. There were great billowing clouds, that soared to a stupendous height, and from which emerged a sound like the rumbling of thunder, or the explosion of unaccountable tons of dynamite. The dust, of unbelievable fineness, settled upon many miles of the adjacent areas, and nothing could be done or determined for days, since all who dared to approach the raging storm were instantly lost and never returned. The terror and mystery of a cataclysm so unparalleled, so far beyond all explanation or imagination, fell like a black pall upon the United States, and horrified the whole civilized world. The dust from the storm, which was analyzed at once, was found to consist of partially disintegrated molecules; and it required no great reach of fantasy for scientists, reporters and the general public to associate the upheaval with the Saharan sand-storm that had given birth to a terrain of unearthly strangeness.