Placing myself close beside the gate, I concentrated every faculty of my mind to the direction of my will, telepathically, upon the brain of the thoat I had selected for my purpose, the selection being determined solely by the fact that he stood nearest to me. The effect of my effort was immediately apparent. The creature, which had been searching for the occasional tufts of moss that grew between the stone flags of the courtyard, raised his head and looked about him. At once he became restless, but he gave forth no sound since I was willing him to silence. Presently his eyes moved in my direction and halted upon me. Then, slowly, I drew him toward me. It was slow work, for he evidently sensed that I was not his master, but on he came. Once, when he was quite near me, he stopped and snorted angrily. He must have caught my scent then and realized that I was not even of the same race as that to which he was accustomed. Then it was that I exerted to their fullest extent every power of my mind. He stood there shaking his ugly head to and fro, his snarling lips baring his great fangs. Beyond him I could see that the other thoats had been attracted by his actions. They were looking toward us and moving about restlessly, always drawing closer. Should they discover me and start to squeal, which is the first and always ready sign of their easily aroused anger, I knew that I should have their riders upon me in no time, since because of his nervous and irritable nature the thoat is the watchdog as well as the beast of burden of the green Barsoomians. For a moment the beast I had selected hesitated before me as though undecided whether to retreat or to charge, but he did neither; instead he came slowly up to me and as I backed through the gate into the vaulted corridor beyond, he followed me. This was better than I had expected for it permitted me to compel him to lie down, so that the girl and I were able to mount with ease. Before us lay a long vaulted corridor at the far end of which I could discern a moonlit archway, through which we presently passed onto a broad avenue. To the left lay the hills, and, turning this way, I urged the fleet animal along the ancient deserted thoroughfare between rows of stately ruins toward the west and--what? Where the avenue turned to wind upward into the hills, I glanced back; nor could I refrain a feeling of exultation as I saw strung out behind us in the moonlight a file of great thoats, which I was confident would well know what to do with their new found liberty. "Your captors will not pursue us far," I said to the girl, indicating the thoats with a nod of my head. "Our ancestors are with us tonight," she said. "Let us pray that they may never desert us."