Norman accompanied Sawtelle on a futile search of the top floor. When they came back, Evelyn was alone. "Tansy's gone out to the car," she told Norman weakly. "I'm sure I just imagined those footsteps." But her eyes were still full of fear when he left her, with Sawtelle fussing about straightening the coverlet and shaking out the pillows. As he went down the stairs he became aware of a hard object in his pocket, and he remembered the lucite egg. He had not placed it. But, as things stood now, he must first know more. Tansy was sitting in the car, staring ahead. He could see that the body was still dominated by its one emotion. He did have to ask a question. "She does not have my soul," were the words. "I questioned her at length. As a final and certain test I embraced her. That was when she screamed. She is very much afraid of the dead." "What did she tell you?" "She said that someone came and took my soul from her. Someone who did not trust her very much. Someone who desired my soul, to keep as a hostage and for other reasons. Mrs. Gunnison." And he had seen it and not known. The knuckles of his hands were white on the steering wheel. That puzzling look of appeal that Mrs. Gunnison had given him. For an instant Tansy had managed to look out of her eyes. And he had not known it. XIV. Professor Carr finished his inspection of the first of the five sheets. "Yes," he said, "these are undoubtedly equations in symbolic logic." Norman had been pretty sure they were, but he was glad to hear a mathematician say so. The hurried reference he had made to _Principia Mathematica_ had not altogether satisfied him. "The capitals stand for classes of entities, the lower case letter for relationships," he said helpfully. "Ah ... yes--" Professor Carr's voice became a trifle diffident, and he rubbed his chin beneath the white Vandyke. "But what do they ... refer to ... if I may ask?" "You could perform operations on the equations, couldn't you, without knowing the references of the individual symbols?" Norman countered, "Most certainly. And the results would be valid--always providing that the original references had been made correctly." "Then here's my problem," Norman went on hastily. "There are seventeen equations on that first sheet. As they stand, they are not consistent with each other. Now I'm wondering if one simple, underlying equation doesn't appear in each of the seventeen, jumbled up with a lot of nonessential terms and meaningless procedures. Each of the other sheets presents a similar problem." "Hm-m-m--" Professor Carr began to finger a pencil, and his eyes started to go back to the intriguing sheet, but he checked the movement. "I must confess I'm rather curious about those references," he said, and added innocently, "I wasn't aware that there had been attempts to apply symbolic logic to sociology."