of a port nearby and gazed out onto the beach we had so hurriedly deserted. There were three or four of the glowing things huddled shapelessly around our abandoned suits, and ragged holes showed in several places in the thin copper helmets. Even as we looked, they dissolved into nothingness, and after a few seconds of hesitation, the things swarmed swiftly back to the ship.

"Well," I commented, trying to keep my voice reasonably free from the feelings which gripped me, "I believe we're beaten, Hendricks. At least, we're helpless against them. Our only chance is that they'll leave us before they have eaten through the second skin; so long as we still have that, we can live ... and perhaps be found."

"I doubt they'll leave us while there's a scrap of metal left, sir," said Hendricks slowly. "Something's brought them from their usual haunts. There's no reason why they should leave a certainty for an uncertainty. But we're not quite through trying. I saw something—have I your permission to make another try at them? Alone, sir?"

"Any chance of success, lad?" I asked, searching his eyes.

"A chance, sir," he replied, his glance never wavering. "I can be ready in a few minutes."

"Then, go ahead—on one condition: that you let me come with you."

"Very good, sir; as you wish. Have two other breathing masks ready. I'll be back very soon."

And he left me hastily, taking the steps of the companionway two at a time.

It was nearly an hour before Hendricks returned, bringing with him two of the most amazing pieces of apparatus I have ever seen.

To make each of them, he had taken a flask of compressed air from our emergency stores, and run a flexible tube from it into a cylindrical drinking water container. Another tube, which I recognized as being a part of our fire-extinguishers, and terminating in a metal nozzle, sprouted from the water container. Both tubes were securely sealed into the mouth of the metal cylinder, and lengths of hastily-knotted rope had been bound around each contrivance so that the two heavy containers, the air flask and the small water tank could be slung from the shoulders.

"Here, sir," he said hastily, "get into a breathing mask, and put on these things as you see me do. No time to explain anything now, except this: as soon as you're outside the ship, turn the valve that opens the compressed air 

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