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For those of a more studious turn of mind it may be interesting to know the Martian table of linear measurement, and so I give it here: 10 sofads = 1 ad 200 ads = 1 haad 100 haads = 1 karad 360 karads = 1 circumference of Mars at equator. A haad, or Barsoomian mile, contains about 2,339 Earth feet. A karad is one degree. A sofad about 1.17 Earth inches. Still the man shook his head.

There was nothing needed but a propellor to make her fit for the long voyage to Helium. Gahan shrugged impatiently there must not be a propellor within a thousand haads. But what mattered it?

She could only guess at the distance she had been carried for she could not believe in the correctness of the high figures that had been piled upon the record of her odometer. They seemed unbelievable and yet, had she known it, they were quite true in twelve hours she had flown and been carried by the storm full seven thousand haads.

If it was inhabited, then must her approach be cautious, for only enemies might be expected to abide in so far distant a land. Tara of Helium knew that she must be far from the twin cities of her grandfather's empire, but had she guessed within even a thousand haads of the reality, she had been stunned by realization of the utter hopelessness of her state.

Thirteen and a half thousand haads away lay Ptarth a stiff thirty-hour journey for the swiftest of fliers, and between Dusar and Ptarth might lie half the navy of Dusar, for in this direction was the reported seat of the great naval battle that even now might be in progress.

With her giant protector by her side Thuvia set forth to find the passage through the cliffs, that she might attempt the seemingly impossible feat of reaching far-distant Ptarth across the more than seventeen thousand haads of savage Barsoom.

From our loftiest tower we have never seen another city than Lothar." Carthoris pointed toward the north-east. "In that direction lie Helium and Ptarth," he said. "Helium is over eight thousand haads from Lothar, while Ptarth lies nine thousand five hundred haads north-east of Helium." On Barsoom the AD is the basis of linear measurement.

From the boundary of Torquas to the city of Aaanthor is a distance of some two hundred haads, so that the Heliumite had before him a journey of more than one hundred and fifty Earth miles between him and Aaanthor. He could at best but hazard a chance guess that toward Aaanthor Thuvia would take her flight.