The process went on for three or four hours as nearly as Sherman could judge the time, ending with a flash of the word "Exit" in red from the screen and a dimming of the blue-dome light. He turned toward the door and found the car that had brought him, ready for the return journey. As it rumbled back to his cell he ruminated on the fact that none of the men (or whatever it was) behind this place had yet made themselves visible, for it was incredible that beings of the type of the metallic ape-man who occupied the next cell to his should have intelligence enough to operate such obviously highly-developed machinery. But what next? He pondered the question as the car deposited him in his cell. Obviously, he was being kept a prisoner. He didn't like it, however comfortable the imprisonment. The first thing that suggested itself was a closer inspection of his cell. The lectern yielded an oil-ball like that the ape-man had given him and another, similar device, containing grease. There were various tools of uncertain purpose and in the last drawer he examined a complete duplicate set of wrist and finger joints. The larger cupboard had deep drawers, mostly empty, though one of them contained a number of books, apparently selected at random from a good-sized sized library--"Mystery of Oldmixon Hall," "Report of the Smithsonian Institution, 1903," "The Poems of Jerusha G. White"--a depressing collection. This seemed to exhaust the possibilities of the cell and Sherman looked about for further amusement. His ape neighbor had pressed himself close to the bars on that side, indicating his interest in what Sherman was doing by chuckling bubbles of amusement. Further down the line one of the ape-men was holding the pair of handles that projected from the wall beside his cabinet. Sherman grasped his also; there was a pleasant little electric shock and in the center of the wall before him a slide moved back to disclose a circle of melting light that changed color and form in pleasing variations. The sensation was enormously invigorating and it struck the aviator with surprise that this must be the way these creatures.... "These creatures!" he thought, "I'm one of them...." the way these creatures acquired nourishment. The thought gave him an inspiration. "Hey!" he called in a voice loud enough to carry throughout the room. "Is there anyone here that can understand what I'm saying?" There was a clank of metal as faces turned in his direction all down the line of cages. "Yes, I guess so," called a voice from about thirty feet away. "What do you want to say?" Sherman felt an overwhelming sense of relief. He would not have believed it possible to be so delighted with a human voice. "Who's got us here and why are they keeping us here?" he shouted back. A moment's silence. Then--"Near's I can make out it's a passel of elephants and they've got us here to work." "What?" Sherman shouted back, not sure he had heard aright.