"I never knew exactly how long it was that I paced about the lower floor of Drayle's home before the doctor summoned me and announced that the patient wanted me, but that I must be careful not to excite him. I have often wondered how many physicians would have to abandon their profession if they were deprived of that phrase. 'You must not excite the patient.' "Drayle was already excited when I entered. In fact, he was furious at the doctor's efforts to restrain him. But I realized that my fear for his reason was groundless. His remarks were lucid and forceful as he raged at the interference with his work. As soon as he saw me he appealed for assistance. "'Make them let me alone. Tim,' he begged, as his wife and the doctor, partly by force and partly by persuasion, endeavored to hold him in bed. 'I must get back to the laboratory. That woman believes that I've killed her husband, and my assistant will think that we've failed.' * * * * * "I was about to argue with him when suddenly he managed to thrust the doctor aside and start toward the door. His seriousness impressed me so that I gave him a supporting arm and together we headed down the hall, with Mrs. Drayle and the doctor following anxiously in the rear. The laboratory was deserted and locked when we arrived. The police evidently felt it was too uncanny an atmosphere for a prolonged wait. Drayle opened the door, went directly to his machine, and examined it minutely. "'Thank the Lord that woman hit only me!' he said, and sank into a chair. Then he asked for some brandy. Mrs. Drayle rushed off and reappeared in a minute with a decanter and glass. Drayle helped himself to a swallow that brought color to his cheeks and new strength to his limbs. Immediately after he turned again to the machine. I dragged up a chair, assisted him into it, and seated myself close by. "I knew little enough about mechanics, but I was fascinated by the numerous gauges that faced me on the gleaming instrument board. There were dials with needlelike hands that registered various numbers; spots of color appeared in narrow slots close to a solar spectrum: a stream of graph-paper tape flowed slowly beneath a tracing-pen point and carried away a jiggly thin line of purple ink. In a moment Drayle was oblivious of everything but his records. I watched him copy the indicated figures, surround them with formulas, and solve mysterious problems with a slide-rule.