started, swung to and fro in the arc of a circle; the pointer swung beside it. But the pointer, after starting to swing, could be instantaneously stopped by an electro-magnet. This magnet was connected with a battery and wires led from it to the two instruments used in the test. The first pair of wires connected with two bits of steel which Trant, in conducting the test, would hold between his lips. The least motion of his lips to enunciate a word would break the electric circuit and start swinging the pendulum and the pointer beside it. The second pair of wires led to a sort of telephone receiver. When Margaret would reply into this, it would close the circuit and instantaneously the electro-magnet clamped and held the pointer. A scale along which the pointer traveled gave, down to thousandths of a second, the time between the speaking of the suggesting word and the first associated word replied.
Trant had this instrument set up and tested before he had to turn and admit Dr. Reiland. Mr. Branower and President Joslyn soon joined them, and a moment after a nurse entered supporting Margaret Lawrie. Dr. Reiland himself scarcely recognized her as the same girl who had come running across the campus to them only the morning before. Her whole life had been centered on the father so suddenly taken away.
Trant nodded to the nurse, who withdrew. He looked to Dr. Reiland.
"Please be sure that she understands," he said, softly. The older man bent over the girl, who had been placed upon the bed.
