they presently went wider and wider, for slowly he had come to recognize the features of the Prince of Helium.
The Heliumite was pressing close upon Vas Kor. The noble was bleeding from a dozen wounds. Astok saw that he could not for long withstand the cunning craft of that terrible sword hand.
"Courage, Vas Kor!" he whispered in the other's ear. "I have a plan. Hold him but a moment longer and all will be well," but the balance of the sentence, "with Astok, Prince of Dusar," he did not voice aloud.
Vas Kor, dreaming no treachery, nodded his head, and for a moment succeeded in holding Carthoris at bay. Then the Heliumite and the girl saw the Dusarian prince run swiftly to the opposite side of the chamber, touch something in the wall that sent a great panel swinging inward, and disappear into the black vault beyond.
It was done so quickly that by no possibility could they have intercepted him. Carthoris, fearful lest Vas Kor might similarly elude him, or Astok return immediately with reinforcements, sprang viciously in upon his antagonist, and a mo-
