It was not till long after that the boys heard the full measure of his villainy. How posing as a naturalist he had wandered up and down the Ivory Coast for years acting as the secret agent of Muley-Hassan and making arrangements for the smuggling of slaves and illicitly procured ivory out of the country. He was too accomplished a rascal to be suspected and his learned appearance made it still more improbable that he should be engaged in any illegal trafficking. It was small wonder, too, that he had started when Frank mentioned the name of Luther Barr, for it was Luther Barr whom he had betrayed to Muley-Hassan and advised him of the whereabouts of the wily old New Yorker's ivory cache. As soon as he heard Frank mention the name he had of course surmised that the pretended hunting expedition was merely a blind to cover a bold dash to recover the ivory, though how they were to discover its whereabouts he could not imagine till, by prying and listening, he learned that they had a map of the locality of the stolen stuff.
He had then dispatched native canoe-men to Muley-Hassan and apprised him of the coming of the boys, and Diego had been at once sent out by the Arab to secure possession of the map if possible and, failing that, to destroy the boys' canoes. That the aeroplane would also have been put out of commission there is little doubt, if Diego or Wiseman could have found an opportunity. The brutal Arab could then have disposed of the expedition at his leisure. But the Golden Eagle II was too closely guarded for the two spies to be able to harm it.
The Kroomen porters attached to the camp had, as old Sikaso had forecast, fled into the jungle at the first attack of the Arab's followers and they did not put in an appearance till long after the marauders had left the camp.
But what puzzled the boys, as they stood facing the Arab with Professor Wiseman's scream still ringing in their ears, was "What had become of the old warrior."
He could not have turned traitor. His valiant behavior in the skirmish made that impossible to consider a minute. But it was equally certain that he was nowhere to be seen. What could have become of him? A dread that he was dead oppressed both boys as they stood there waiting for the Arab to speak.
Muley-Hassan seemed to be considering.
He twisted the ends of his jet-black mustaches like a man lost in thought, and the firelight playing on his bold reckless features showed there an expression of deep perplexity. But it was no question of mercy that was agitating his mind.
It was whether he would kill the boys right there or sell them into slavery.
To his money-making mind the latter idea commended itself. Two strong youths such as they were would fetch a good price anywhere, and so it came about that Billy and Lathrop—who had fully expected to share the Professor's fate—were flung by no gentle hands into their bullet-riddled tent and left to pass the night as best they could. Two men were posted to watch them and a rough cuff on the head rewarded Billy's single attempt to speak to Lathrop.
The next day at dawn the camp was the scene of great activity. The dead were carried into the forest a short distance and buried, while the wounded were attended to with such rough surgery as Muley-Hassan knew. In this work Diego, his lieutenant, who seemed to be a sort of Jack-of-all-trades—outside of his regular occupation of scoundrel—aided him; bandaging the cuts and extracting the bullets of his companions with some skill.