A Surprise for the Janissaries. 199 XXVI. The Revolutionists Succeed. 207 XXVII. Athensi Falls. 213 XXVIII. Conclusion. 219 THE RADIO BOYS SEEK THE LOST ATLANTIS CHAPTER I. INTRODUCTION. Jack Hampton wearily passed a hand across his eyes. Would they never sight the oasis at which Ali had promised they would arrive at the end of the day’s march? Even after many days of travel on camel-back, Jack had not become sufficiently accustomed to the soft-footed swaying brute to make a long day’s ride a pleasure. And this was a long day’s ride indeed. Except for a brief halt at noon the caravan had been on the march across the lifeless sand dunes of the desert, unbroken by trees, rocks, animals or human beings, unbroken by anything, in fact, except occasional stunted bushes, since dawn. In another half hour the sun would descend, and if the promised oasis were not sighted by then, they would be forced to spend another night on the desert. Looking back from his position at the head of the column, Jack could see Bob Temple and Frank Merrick, both mounted as was he, behind them a half dozen shuffling camels with astride each among the bundles a swarthy Arab enfolded in the inevitable jillab, from the folds of which stuck out a long-barrelled rifle, and bringing up the rear Jack’s father and Ali, his head man, both engaged in conversation. The loop aerial rigged up on Frank’s camel caught Jack’s gaze, and his eyes brightened. He decided he would break the monotony of this desert travel by kidding his friend. And with that purpose in view, he halted his camel, to await Frank’s approach. To himself Jack chuckled as he thought of the bewilderment and wonder which Frank had aroused amongst the camel drivers by his aerial. Attached to a light frame strapped to the camel’s hump, ground wire trailing between the animal’s feet, Frank had rigged up the set the day before upon Ali’s declaration that another day would see them at the Oasis Aiz-Or. He wanted to be in a position to receive any message which Professor Souchard, a Swiss savant, who awaited their coming, might send out. For with him Professor Souchard had a duplex radio apparatus for both sending and receiving, which the boys jointly had devised.