Chapter 11

Early the next morning Xodar and I commenced work upon our plans for escape. First I had him sketch upon the stone floor of our cell as accurate a map of the south polar regions as was possible with the crude instruments at our disposal--a buckle from my harness, and the sharp edge of the wondrous gem I had taken from Sator Throg.

From this I computed the general direction of Helium and the distance at which it lay from the opening which led to Omean.

Then I had him draw a map of Omean, indicating plainly the position of Shador and of the opening in the dome which led to the outer world.

These I studied until they were indelibly imprinted in my memory. From Xodar I learned the duties and customs of the guards who patrolled Shador. It seemed that during the hours set aside for sleep only one man was on duty at a time. He paced a beat that passed around the prison, at a distance of about a hundred feet from the building.

The pace of the sentries, Xodar said, was very slow, requiring nearly ten minutes to make a single round. This meant that for practically five minutes at a time each side of the prison was unguarded as the sentry pursued his snail like pace upon the opposite side.

"This information you ask," said Xodar, "will be all very valuable AFTER we get out, but nothing that you have asked has any bearing on that first and most important consideration."

"We will get out all right," I replied, laughing. "Leave that to me."

"When shall we make the attempt?" he asked.

"The first night that finds a small craft moored near the shore of Shador," I replied.

"But how will you know that any craft is moored near Shador? The windows are far beyond our reach."

"Not so, friend Xodar; look!"

With a bound I sprang to the bars of the window opposite us, and took a quick survey of the scene without.

Several small craft and two large battleships lay within a hundred yards of Shador.

"To-night," I thought, and was just about to voice my decision to Xodar, when, without warning, the door of our prison opened and a guard stepped in.

If the fellow saw me there our chances of escape might quickly go glimmering, for I knew that they would put me in irons if they had the slightest conception of the wonderful agility which my earthly muscles gave me upon Mars.

The man had entered and was standing facing the centre of the room, so that his back was toward me. Five feet above me was the top of a partition wall separating our cell from the next.

There was my only chance to escape detection. If the fellow turned, I was lost; nor could I have dropped to the floor undetected, since he was no nearly below me that I would have struck him had I done so.

"Where is the white man?" cried the guard of Xodar. "Issus commands his presence." He started to turn to see if I were in another part of the