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6 They were faint and ghostly, as if coming from a vast distance—equally far removed from New York and San Francisco, Juneau and Panama.

Exactly two minutes apart the calls were repeated, with clocklike regularity. But the code used—if it were a code—was undecipherable.

Until near dawn the signals continued—indistinct, unintelligible, insistent.

Every station capable of transmitting messages over such great distances emphatically denied sending them. And no amateur apparatus was powerful enough to be the cause. As far as anyone could learn, the signals originated nowhere upon the earth. It was as if some phantom were whispering through the ether in the language of another planet.

Two nights later the calls were heard again, starting at almost the same instant when they had been distinguished on the first occasion. But this time they were precisely three minutes apart. And without the variation of a second they continued for more than an hour.

The next night they reappeared. And the next and the next. Now they began earlier than before—in fact, no one knew when they had started, for they were sounding when the night's business died down sufficiently for them to be heard. But each night, it was noticed, the interval between the signals was exactly one minute longer than the night before.

Occasionally the weird whispers ceased for a night or two, but always they resumed with the same insistence, although with a newly-timed interval.

This continued until early in July, when the pause between the calls had attained more than thirty minutes' duration.

Then the length of the lulls began to decrease erratically. One night the mysterious summons would be heard every nineteen and a quarter minutes; the next night, every ten and a half minutes; at other times, twelve and three-quarters minutes, or fourteen and a fifth, or fifteen and a third.

Still the signals could not be deciphered, and their message— if they contained one—remained a mystery.

Newspapers and scientific journals at last began to speculate upon the matter, advancing all manner of theories to account for the disturbances.

The only one of these conjectures attracting widespread attention, however, was that presented by Professor Howard Whiteman, the famous director of the United States naval observatory at Washington, D.C.

Professor Whiteman voiced the opinion that the planet Mars was trying to establish communication with the earth—the mysterious calls being wireless signals sent across space by the inhabitants of our neighboring world.

Our globe, moving through space much faster than Mars, and in a smaller orbit, overtakes its neighboring planet once in a little over two years. For some months Mars had been approaching the earth. At the beginning of June it had been approximately 40,000,000 miles away, and at that time, Professor Whiteman pointed out, the strange wireless calls had commenced. As the two worlds drew closer together the signals increased slightly in power.

The scientist urged that while Mars remained close to us the government should appropriate funds to enlarge one of the principal wireless stations in an effort to answer the overtures of our neighbors in space.

But when, after two more days, the ethereal signals ceased abruptly and a week passed without their recurrence, Professor Whiteman's theory began to be derided, and the whole thing was dismissed as some temporary phenomenon of the atmosphere.

It was something of a shock, therefore, when, on the eighth night after the cessation of the disturbances, the calls were suddenly resumed—much louder than before, as if the power creating their electrical impulses had been increased. Now wireless stations all over the world plainly heard the staccato, mystifying challenge coming out of the ether.

This time, too, the interval between the signals was of a new length—eleven minutes and six seconds.

The next day the matter took on still further importance.

Scientists all along the Pacific Coast of the United States reported that in the night their seismographs had recorded a series of light earthquakes; and it was noted that these tremors had occurred precisely eleven minutes and six seconds apart—simultaneously with the sounding of the mysterious wireless calls!

After that the aerial signals did not stop during any part of the twenty-four hours. And the earth shocks continued, gradually increasing in severity. They kept perfect time with the signals through the ether—a shock for every whisper, a rest for every pause. In the course of a couple of weeks the quakes attained such force that in many places they could be distinctly felt by anyone standing still upon solid ground.

Science now became fully aware of the existence of some new and sinister—or at least unfathomed—force in the world, and began to give the matter profound study.

However, both Dr. Ferdinand Gresham and I remained in complete ignorance of these events; for, as I have said, we were in the interior of Labrador. We both possessed a keen love of the wilderness, where, in vigorous sports, we renewed our energy for the work to be done in the cities—the doctor's as director of the great astronomical observatory at the National University; mine in the prosaic channels of business.

To the public, which knew him only through his books and lectures, Dr. Gresham perhaps appeared the last person in the world anyone would seek for a companion: a man silent, preoccupied, austere, unsociable. But underneath this aloofness and taciturnity was a character of rare strength, good nature and lovableness. And, once beyond the barriers of civilization, his austerity vanished, and he became a prince of good fellows, actually reveling in hardships and danger.

The complete change in him on such occasions brought to mind a strange phase of his life about which not even I, his most intimate associate, knew anything—a period in which he had undertaken a mysterious pilgrimage alone into the dark interior of China.

I only knew that fifteen years before he had gone in quest of certain amazing astronomical discoveries rumored to have been made by Buddhist savants dwelling in monasteries far back in the Himalayas or the Tian-Shan, or some of those inaccessible mountain fastnesses of Central Asia. After more than four years he had dragged back, ill and suffering, bearing hideous disfigurations upon his body, the look in his eyes of a man who had seen hell, and maintaining inviolate silence regarding his experiences.

On regaining his health after the Chinese adventure, he had immersed himself in silence and work, and year by year since then I had seen him steadily rise in prominence in his profession. Indeed, his name had come to stand for vastly more in the scientific world than merely the advancement of astronomical knowledge. He was a deep student along many lines of scientific endeavor—electricity, chemistry, mathematics, physics, geology, even biology. To the development of wireless telegraphy and the wireless transmission of electrical energy he had devoted particular effort.

The doctor and I had left New York a few days before the wireless