And my delight in being able to talk with you is second only to my relief in being able to appeal to you for help. David is in trouble. He is a captive in the north, or what he and I call north, for there are no points of compass known to Pellucidarians. I have heard from him, however. He has sent me a message and in it he suggests a startling theory that would make aid from the outer crust possible if—but first let me tell you the whole story; the story of the disaster that befell David Innes and what led up to it and then you will be in a better position to judge as to the practicability of sending succor to David from the outer crust. The whole thing dates from our victories over the Mahars, the once dominant race of Pellucidar. When, with our well organized armies, equipped with firearms and other weapons unknown to the Mahars or their gorilla-like mercenaries, the Sagoths, we defeated the reptilian monsters and drove their slimy hordes from the confines of The Empire, the human race of the inner world for the first time in its history took its rightful place among the orders of creation. But our victories laid the foundation for the disaster that has overwhelmed us. For a while there was no Mahar within the boundaries of any of the kingdoms that constitute The Empire of Pellucidar; but presently we had word of them here and there—small parties living upon the shores of sea or lake far from the haunts of man. They gave us no trouble—their old power had crumbled beyond recall; their Sagoths were now numbered among the regiments of The Empire; the Mahars had no longer the means to harm us; yet we did not want them among us. They are eaters of human flesh and we had no assurance that lone hunters would be safe from their voracious appetites. We wanted them to be gone and so David sent a force against them, but with orders to treat with them first and attempt to persuade them to leave The Empire peacefully rather than embroil themselves in another war that might mean total extermination. Sagoths accompanied the expedition, for they alone of all the creatures of Pellucidar can converse in the sixth sense, fourth dimension language of the Mahars. The story that the expedition brought back was rather pitiful and aroused David’s sympathies, as stories of persecution and unhappiness always do. After the Mahars had been driven from The Empire they had sought a haven where they might live in peace. They assured us that they had accepted the inevitable in a spirit of philosophy and entertained no thoughts of renewing their warfare against the human race or in any way attempting to win back their lost ascendancy. Far away upon the shores of a mighty ocean, where there were no signs of man, they settled in peace, but their peace was not for long. A great ship came, reminding the Mahars of the first ships they had seen—the ships that David and I had built—the first ships, as far as we knew, that ever had sailed the silent seas of Pellucidar.