"Well, it's a long cry from a blurred line in a spectrum to a sick nigger in Sumatra. And yet the chiel has shown us once before that he knows what he's talking about. There is some queer illness down yonder, that's beyond all doubt, and to-day there's a cable just come in from Singapore that the lighthouses are out of action in the Straits of Sundan, and two ships on the beach in consequence. Anyhow, it's good enough for you to interview Challenger upon. If you get anything definite, let us have a column by Monday."

I was coming out from the news editor's room, turning over my new mission in my mind, when I heard my name called from the waiting-room below. It was a telegraph-boy with a wire which had been forwarded from my lodgings at Streatham. The message was from the very man we had been discussing, and ran thus:—

Malone, 17, Hill Street, Streatham.—Bring oxygen.—Challenger.

"Bring oxygen!" The Professor, as I remembered him, had an elephantine sense of humour capable of the most clumsy and unwieldly 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 the door of the establishment carrying an iron cylinder, which, with some trouble, they hoisted into a waiting motor-car. An elderly man was at their heels scolding and directing in a creaky, sardonic voice. He turned towards me. There was no mistaking those austere features and that goatee beard. It was my old cross-grained companion, Professor Summerlee.

"What!" he cried. "Don't tell me that you have had one of these preposterous telegrams for oxygen?"

I exhibited it.

"Well, well! I have had one too, and, as you see, very much against the grain, I have acted upon it. Our good friend is as impossible as ever. The need for oxygen could not have been so urgent that he must desert the usual means of supply and encroach upon the time of those who are really busier than himself. Why could he not order it direct?"

I could only suggest that he probably wanted it at once.

"Or thought he did, which is quite another matter. But it is superfluous now for you to purchase any, since I have this considerable supply."