We were all quite gay as we sailed off toward Ombra. Jat Or and Zanda were planning upon the home they expected to establish in Helium, and Ur Jan was anticipating a position among the fighting men of my retinue and a life of honor and respectability.

Presently, Zanda called my attention to the fact that we were gaining considerable altitude, and complained of dizziness. Almost at the same time I felt a weakness stealing over me, and simultaneously Ur Jan collapsed.

Followed by Jat Or, I staggered to the control room, where a glance at the altimeter showed me that we had risen to dangerous heights. Instantly I directed the brain to regulate the oxygen supply in the interior of the ship, and then I directed it to drop nearer to the surface of the satellite.

It obeyed my directions insofar as the oxygen supply was concerned, but it continued to rise past the point where the altimeter could register our height.

As Thuria faded in the distance astern, I realized that we were flying at tremendous speed, a speed far in excess of that which I had directed.

It was evident that the brain was entirely out of control. There was nothing more that I could do; so I returned to the cabin. Here I found that both Zanda and Ur Jan had recovered, now that the oxygen supply had been replenished.

I told them that the ship was running wild in space and that our eventual fate could be nothing more than a matter of idle speculation— they knew as much about it as I.

My hopes, that had been so high, were now completely dashed; and the farther that we sped from Thuria, the greater became my anguish, though I hid my personal feelings from my companions.

It was not until it became apparent that we were headed for Barsoom that even hope of life was renewed in the breasts of any of us.

As we drew near the surface of the planet, it became evident to me that the ship was fully under control; and I wondered whether or not the brain itself had discovered the power of original thought, for I knew that I was not controlling it nor were any of my companions.

It was night, a very dark night. The ship was approaching a large city. I could see the lights ahead, and as we drew closer I recognized that the city was Zodanga.

As though guided by a human hand and brain, the ship slid silently across the eastern wall of the great city, dropped into the shadows of a dark avenue, and moved steadily toward its unknown destination.

But not for long was the destination to be unknown. Presently the neighborhood became familiar. We were moving very slowly. Zanda was with me in the control room, gazing through one of the forward ports.

"The house of Fal Sivas!" she exclaimed.

I recognized it, too, and then just in front of us I saw the open doors of the great hangar from which I had stolen the ship.