tail-stream been discovered? It seemed not. There was no undue movement of the Tollgamo lights. Just a slow-moving little string of them, ahead and below us.

I could see the bottom now, a great undulating spread here of dark surface. Rock, doubtless, with slime and ooze on it. The moving dots of light presently disclosed the blobs of enemy vessels. Ten of them, crawling on the bottom in a slow moving line. Cubes and oblongs of metal. Dwarfed by distance they were like struggling little bugs, with lighted eyes and tiny searchbeams waving like feelers before them. Metallic vehicles, perhaps with caterpiller tread, crawling on the bottom.

We drifted closer; almost over them for a moment so that I could guess that each of them was a hundred feet or more in length. Turreted oblong vessels, armoured; and armed with the three hundred foot rays. How many men were in them? Of this Leh had little knowledge, save that he thought perhaps a total of two thousand. Men and women, crawling along in the ooze of this sea bottom, tense, with minds only upon the kill.

"They're heading for Arron," Leh murmured. "In those big ships they surely must have a vast apparatus for land attack."

To come up abruptly within the lagoons and interior waterways of Arron. Perhaps then, on the windward side of the city, to loose their deadly lethal gas.

Two hours, at least, for them to reach Arron. The lights crawled under us; and a vagrant ocean current drifted us away, so that presently we dared fling on our rocket-stream power and speed back to Peters. He was ready now, and his hundred men embarked in the fifty little cylinders. And the five hundred girls were ready, too. I saw them on the ocean surface, from the turret of our cylinder as we bobbed to the top. An amazing army of green-clad nymphs. Each of them had a ray-cylinder of our fifty foot projector. They lay, each of them on a six-foot little sub-sea sled, powered, like our cylinders, with the oxo-hydro gas-streams. In effect, a narrow, six foot long raft, with a hooded bow that housed the control mechanisms and protected the girls' faces from the rush of water. The girls' bodies had a weight of about the same as water. Specific gravity of 1. And the sled with its mechanisms was adjusted to be the same. Girl and sled—neither to float nor sink, but approximately to hang poised. And thus, with little tilting fins on the sled's sides, and lateral and vertical bow and stern rudders, the power would thrust them down into the depths and up again at will.

We started. Running at first on the 

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