"Yours faithfully, "GEORGE EDWARD CHALLENGER.

"THE BRIARS, ROTHERFIELD."

"It's a fine, steemulating letter," said McArdle thoughtfully, fitting a cigarette into the long glass tube which he used as a holder. "What's your opeenion of it, Mr. Malone?"

I had to confess my total and humiliating ignorance of the subject at issue. What, for example, were Fraunhofer's lines? McArdle had just been studying the matter with the aid of our tame scientist at the office, and he picked from his desk two of those many-coloured spectral bands which bear a general resemblance to the hat-ribbons of some young and ambitious cricket club. He pointed out to me that there were certain black lines which formed crossbars upon the series of brilliant colours extending from the red at one end through gradations of orange, yellow, green, blue, and indigo to the violet at the other.

"Those dark bands are Fraunhofer's lines," said he. "The colours are just light itself. Every light, if you can split it up with a prism, gives the same colours. They tell us nothing. It is the lines that count, because they vary according to what it may be that produces the light. It is these lines that have been blurred instead of clear this last week, and all the astronomers have been quarreling over the reason. Here's a photograph of the blurred lines for our issue to-morrow. The public have taken no interest in the matter up to now, but this letter of Challenger's in the Times will make them wake up, I'm thinking."

"And this about Sumatra?"

"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."

"Still, for some reason he seems to wish that I should bring oxygen too. It will be safer to do exactly what he tells me."

Accordingly, in spite of many grumbles and remonstrances from Summerlee, I ordered an additional tube, which was placed with the other in his motor-car, for he had offered me a lift to Victoria.

I turned away to pay off my taxi, the driver of which was very cantankerous and abusive over his fare. As I came back to Professor Summerlee, he was having a furious altercation with the men who had carried down the oxygen, his little white goat's beard jerking with indignation. One of the fellows called him, I remember, "a silly old bleached cockatoo," which so enraged his chauffeur that he bounded out of his seat to take the part of his insulted master, and it was all we could do to prevent a riot in the street.

These little things may seem trivial to relate, and passed as mere incidents at the time. It is only now, as I look back, that I see their relation to the whole story which I have to unfold.

The chauffeur must, as it seemed to me, have been a novice or else have lost his nerve in this disturbance, for he drove vilely on the way to the station. Twice we nearly had collisions with other equally erratic vehicles, and I remember remarking to Summerlee that the standard of driving in London had very much declined. Once we brushed the very edge of a great crowd which was watching a fight at the corner of the Mall. The people, who were much excited, raised cries of anger at the clumsy driving, and one fellow sprang upon the step and waved a stick above our heads. I pushed him off, but we were glad when we had got clear of them and safe out of the park. These little events, coming one after the other, left me very jangled in my nerves, and I could see from my companion's petulant manner that his own patience had got to a low ebb.

But our good humour was restored when we saw Lord John Roxton waiting for us upon the platform, his tall, thin figure clad in a yellow tweed shooting-suit. His keen face, with those unforgettable eyes, so fierce and yet so humorous, flushed with pleasure at the sight of us. His ruddy hair was shot with grey, and the furrows upon his brow had been cut a little deeper by Time's chisel, but in all else he was the Lord John who had been our good comrade in the past.

"Hullo, Herr Professor! Hullo, young fella!" he shouted as he came toward us.

He roared with amusement when he saw the oxygen cylinders upon the porter's trolly behind us. "So you've got them too!" he cried. "Mine is in the van. Whatever can the old dear be after?"

"Have you seen his letter in the Times?" I asked.

"What was it?"

"Stuff and nonsense!" said Summerlee Harshly.

"Well, it's at the bottom of this oxygen business, or I am mistaken," said I.

"Stuff and nonsense!" cried Summerlee again with quite unnecessary violence. We had all got into a first-class smoker, and he had already lit the short and charred old briar pipe which seemed to singe the end of his long, aggressive nose.

"Friend Challenger is a clever man," said he with great vehemence. "No one can deny it. It's a fool that denies it. Look at his hat. There's a sixty-ounce brain inside it-a big engine, running smooth, and turning out clean work. Show me the engine-house and I'll tell you the size of the engine. But he is a born charlatan-you've heard me tell him so to his face-a born charlatan, with a kind of dramatic trick of jumping into the limelight. Things are quiet, so friend Challenger sees a chance to set the public talking about him. You don't imagine that he seriously believes all this nonsense about a change in the ether and a danger to the human race? Was ever such a cock-and-bull story in this life?"