"But--" "Consider. That door has never been opened. There is certainly no other exit to this cavern." "And I have no recollection of ever having lived before," the young man said slowly. "Yet you can converse with me. You obviously have been given an education." "But how?" "It is known that knowledge can be injected into the subconscious while the receiver sleeps. I'm sure the man you insist upon calling Portox was aware of this--this and perhaps other scientific miracles. Who are we to say that you were not nourished by some means beyond our knowledge?" But that investigation was never to be made because as John Pride extended his hand to touch the box it suddenly burst into a glow and he withdrew his fingers quickly. Before the younger man could answer a glowing point of light sprang into being and brightened and a wave of searing heat erupted from the walls of the room, searing the eyes of John Pride and leaving him to grope helplessly as in the heart of a furnace. The younger man was beyond his reach. Blinding pain caused him to reel. **CHAPTER V_Question Upon Question_** John Pride opened his eyes as a moan escaped his lips. The haze cleared and he found himself lying upon a cool stone floor looking up into the concerned face of the younger man. "What happened?" John Pride asked feebly. He tried to refocus. "I don't know except that the heat of that fire was upon us with such swiftness that we were almost incapacitated. I picked you up and started walking. Fortunately I moved in the direction of the door. Otherwise we would have been doomed." "I am in your debt." "No more so than I in yours." "Did you extinguish the fire?" "It burned out of its own accord. But only after the cave was completely gutted. There is nothing left in there but the bare rock walls."