I knew that if we did not obey their command they would open fire on us, and a single hit might put an end to all my plans to reach Thuria and save Dejah Thoris.

While the armament of the ship, as described to me by Fal Sivas, would have given me an overwhelming advantage in an encounter with any patrol boat, I hesitated to stand and fight, because of the chance that a lucky shot from the enemy's ship might disable us.

Fal Sivas had boasted of the high potential speed of his brain conception; and I decided that however much I might dislike to flee from an enemy, flight was the safest course to pursue.

Zanda had her face pressed to one of the numerous ports in the bull of the ship.

The wail of the patrol boat siren was now continuous—an eerie, menacing voice in the night, that pierced the air like sharp daggers.

"They are overhauling us, Vandor," said Zanda; "and they are signalling other patrol boats to their aid."

"They have probably noticed the strange lines of this craft; and not only their curiosity, but their suspicion has been aroused."

"What are you going to do?" she asked.

"We are going to put the speed of Fal Sivas's motor to a test," I replied.

I glanced up at the insensate metal sphere above my head. "Speed up! Faster! Escape the pursuing patrol boat!" Such were the directing thoughts that I imparted to the silent thing above me; then I waited.

I did not, however, have long to wait. No sooner had my thoughts impinged upon the sensitive mechanism than the accelerated whirr of the almost noiseless motor told me that my directions had been obeyed.

"She is no longer gaining on us," cried Zanda excitedly. "We have leaped ahead; we are outdistancing her."

The swift staccato of rapid fire burst upon our ears. Our enemy had opened fire upon us, and almost simultaneously, intermingling with the shots, we heard in the distance the wail of other sirens apprising us of the fact that reinforcements were closing in upon us.

The swift rush of the thin air of Mars along the sides of our ship attested our terrific speed. The lights of the city faded swiftly behind us. The searchlights of the patrol boats were rapidly diminishing bands of light across the starlit sky.

I do not know how fast we were going but probably in the neighborhood of 1350 haads an hour.

We sped low above the ancient sea bottom that lies west of Zodanga; and then, in a matter of about five minutes—it could not have been much more—our speed slackened rapidly, and I saw a small flier floating idly in the still air just ahead of us.

I knew that it must be the flier upon which Jat Or awaited me, and I directed the brain to bring our ship alongside it and stop.

The response of the ship to my every thought direction was uncanny; and when we came alongside of Jat Or's craft and seemingly ghostly hands opened the door in the side of our ship, I experienced a brief sensation of terror, as though I were in the power of some soulless Frankenstein; and this notwithstanding the fact that every move of the ship had been in response to my own direction.