"Don't let him get away!" she cried. "I want to pay him back for what he made me suffer."
Dick held her in his arms to keep her from falling, but Dan, whose hands were free, hurled his flint knife at Abdul just as the Arab's horse galloped away.
The weapon caught the ruffian on the arm and a gush of blood reddened his burnous, but the next instant, clinging to his horse's neck, the fugitive plunged into the forest.
Dick saw to his horror that Jess Slythe had tied his father to a horse and was now in flight, mounted upon another animal.
Professor Oakwood, too proud to call for help, sent one despairing look backward, as Jess Slythe lashed the animal's flanks.
"After him!" shouted Dick Oakwood. "Get me a horse, somebody! We have got to rescue my father!"
But the Arab horses were plunging about beyond hope of capture, and Jess Slythe and his prisoner were already lost in the shadows of the jungle.