sense of humour capable of the most clumsy and unwieldy gambollings. Was this one of those jokes which used to reduce him to uproarious laughter, when his eyes would disappear, and he was all gaping mouth and wagging beard, supremely indifferent to the gravity of all around him? I turned the words over, but could make nothing even remotely jocose out of them. Then surely it was a concise order—though a very strange one. He was the last man in the world whose deliberate command I should care to disobey. Possibly some chemical experiment was afoot; possibly Well, it was no business of mine to speculate upon why he wanted it. I must get it. There was nearly an hour before I should catch the train at Victoria. I took a taxi, and having ascertained the address from the telephone book, I made for the Oxygen Tube Supply Company in Oxford Street.
As I alighted on the pavement at my destination, two youths emerged from
