At that time he lived in one of the houses of Cumberland Terrace, overlooking Regent’s Park. I cannot recall the number; and the place has long ago disappeared; but I remember that it was near St. Katherine’s College and it overlooked the grounds of St. Katherine’s House. Wotherspoon carried his scientific aura even into the arrangement of his residence; for what was normally the drawing-room of the house had been turned into a kind of laboratory-reception-room; so that casual visitors might be impressed by his ardour in the pursuit of knowledge. When anyone called upon him, he was always discovered in this room, fingering apparatus, pouring liquids from one tube into another, producing precipitates or doing something else which would strike the unwary as being part of a recondite process. I had a feeling, when I came upon him in the midst of these manœuvres, that he had sprung up from his chair at the sound of the door bell and had plunged hastily into his operations. I know enough to distinguish real work from make-believe; and Wotherspoon never gave me the impression that he was engaged in anything better than window-dressing. At any rate, nothing ever was made public with regard to the results of these multitudinous experiments; and when, occasionally, I asked him if he proposed to bring out a paper, he merely launched into a diatribe against the jealousy of scientific men. It was about this time that Henley-Davenport was making his earlier discoveries in the field of induced radioactivity. The results were too technical for the unscientific man to appreciate; but I had become interested, not so much in details as in possibilities; and I determined to go across the Park and pay a visit to Wotherspoon one evening. I knew that, as far as published information went, he would be in possession of the latest news; and it was easier to get it from him than to read it myself. It was warm weather then. I decided to use my car instead of walking through the Park. I had a slight headache, and I thought that possibly a short spin later, in the cool of the evening, might take it away. As I drove, I noticed how thunder-clouds were banking up on the horizon, and I congratulated myself that even if they broke I should have the shelter of the car and be saved a walk home through the rain.