secret from it. 

 In addition to our native servants, we took along an English telegraph-operator named Frank Downes. Nothing of interest enlivened our journey by rail and caravan till we came to the cluster of date-palms about the ancient well upon the rim of the Sahara. 

 It was the very spot at which I first had seen David Innes. If he had ever raised a cairn above the telegraph instrument no sign of it remained now. Had it not been for the chance that caused Cogdon Nestor to throw down his sleeping rug directly over the hidden instrument, it might still be clicking there unheard—and this story still unwritten. 

 When we reached the spot and unearthed the little box the instrument was quiet, nor did repeated attempts upon the part of our telegrapher succeed in winning a response from the other end of the line. After several days of futile endeavor to raise Pellucidar, we had begun to despair. I was as positive that the other end of that little cable protruded through the surface of the inner world as I am that I sit here today in my study—when about midnight of the fourth day I was awakened by the sound of the instrument. 

 Leaping to my feet I grasped Downes roughly by the neck and dragged him out of his blankets. He didn’t need to be told what caused my excitement, for the instant he was awake he, too, heard the long-hoped for click, and with a whoop of delight pounced upon the instrument. 

 Nestor was on his feet almost as soon as I. The three of us huddled about that little box as if our lives depended upon the message it had for us. 

 Downes interrupted the clicking with his sending-key. The noise of the receiver stopped instantly. 

 “Ask who it is, Downes,” I directed. 

 He did so, and while we awaited the Englishman’s translation of the reply, I doubt if either Nestor or I breathed. 

 “He says he’s David Innes,” said Downes. “He wants to know who we are.” 

 “Tell him,” said I; “and that we want to know how he is—and all that has befallen him since I last saw him.” 

 For two months I talked with David Innes almost every day, and as Downes translated, either Nestor or I took notes. From these, arranged in chronological order, I have set down the following account of the further adventures of David Innes at the earth’s 

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