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A PRINCESS OF MARS the fact that the leaders passed back whispered word to those behind them.

Suddenly a low but distinct moaning sound issued from the recesses of the cave behind me, and, as it reached the ears of the Indians, they turned and fled in terror, panic stricken. So frantic were their efforts to escape from the unseen thing behind me that one of the braves was hurled headlong from the cliff to the rocks below. Their wild cries echoed in the canyon for a short time, and then all was still once more.

The sound which had frightened them was not repeated, but it had been sufficient as it was to start me speculating on the possible horror which lurked in the shadows at my back. Fear is a relative term and so I can only measure my feelings at that time by what I had experienced in previous positions of danger and by those I have passed through since; but I can say without shame that if the sensations I endured during the next few minutes were fear, then may God help the coward, for cowardice is of a surety its own punishment.

To be held paralyzed, with one's back toward some horrible and unknown danger from the very sound of which the ferocious Apache warriors turn in wild stampede, as a flock of sheep would [16]