Doctor McNeill told me the story in his private office as I sprawled opposite him in an easy-chair. The gold and crimson of late afternoon changed to the violet of early dusk, but still I sat awed and motionless. I resented every ring of the telephone and every whir of the buzzer, and I could have cursed the nurses and internes whose knocks now and then summoned the doctor briefly to the outer office. Night came, and I was glad my host switched on all the lights. Scientist though I was, my zeal for research was half forgotten amid such breathless ecstasies of fright as a small boy might feel when whispered witch-tales go the rounds of the chimney-corner.