of the automatic temperature control, the machine was comfortable enough, though the heat and humidity on deck were stifling.

When we had rested, we turned the bow of the Omnimobile toward the north and cruised along at a speed of four or five knots. I stood in the conning-tower at the wheel, while Sam busied himself with making an analysis of the air, and of a sample of water from the sea. Presently he came up out of the little laboratory, with his report.

"The air shows to be 31% oxygen," he said, "and 64% helium, with the remainder a mixture of various other gases. The barometer pressure is only eleven pounds, which compensates for the excess of oxygen. The helium is a good indication of the radioactivity which must have produced the gas overhead, since helium is one of the ultimate products of radium disintegration. The oxygen must have come largely from the breaking up of carbon dioxide by plant life."

"Then there is life?"

"There were microscopic organisms, both animal and vegetable, in the sample of water I took. The water, by the way, carries only 1.23% solid matter, mostly sodium chloride. Less than half as much as the sea above, which has 2.7%."

For several hours longer we moved slowly over the surface of that warm, silent sea. In all directions it lay flat as far as my eye could reach, its blue-black depths glancing with the unearthly crimson of the sky. Sam was still working in the laboratory and looking after the machinery.

And then I saw the first living thing!

My roving eye caught a tiny black speck against the gleam of the bloody sky. It was soaring, drifting slowly, like a vast bird--its motion was too irregular, I thought, to be that of a flying machine. I flung the little port open, and tried to get my binoculars upon it. It was very far away, but I made out that it was a vast, strange, winged thing. It seemed very large to be a bird. And its colors were bright--fantastic! It seemed--I was sure--that its wings were green! But it seemed to be moving faster than I had thought. I never got it clearly into focus, and suddenly it dived, and was lost beneath the horizon!

"Sam! Sam!" I called sharply. "I've seen something--something _alive_!"

In a moment he was climbing up into the conning-tower, with a question on his lips. I described my confused impression of the thing as best I could, mentioning the strange colors.

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