few hurried steps away from the ship, and then turned to survey the monsters which had attacked it.

They literally covered the ship; in several places their transparent, glowing bodies overlapped. And the sides of the Ertak, ordinarily polished and smooth as the surface of a mirror, were dull and deeply eroded.

"Notice, sir," emanated Hendricks excitedly, "how much brighter the things are! They are feeding, and they are growing stronger and more brilliant. They —look out, sir! They're attacking! Our copper helmets—"

But I had seen it as quickly as he. Half a dozen of the glowing things, sensing in some way the presence of a metal which they apparently preferred to that of the Ertak's hull, suddenly detached themselves and came swarming directly down upon us.

I was standing closer to the ship than Hendricks, and they attacked me first. Several of them dropped upon me, their glowing bodies covering the vision-piece, and blinding me with their light. I waved my arms and started to run blindly, incoherent warnings coming to me through the menore from Hendricks and the sentries.

The things had no weight, but they emitted a strange, electric warmth which seemed to penetrate my entire body instantly as I ran unseeingly, trying to find the ship, tearing at the fastenings of my mask as I ran. I could not, of course, enter the ship with these things clinging to my garments.

Suddenly I felt water splash under my feet; felt its grateful coolness upon my legs, and with a gasp I realized I had in my confusion been running away from the ship, instead of toward it. I stopped, trying to get a grip on myself.

The belt of the breathing mask came loose, and I tore the thing from me, holding my breath and staring around wildly. The ship was only a few yards away, and Hendricks, his mask already off, was running toward me.

"Back!" I shouted. "I'm all right now. Back!" He hesitated for an instant until I caught up with him, and then, together, we gained the safety of the air-lock. Without orders, the men swung shut the ponderous door, and Hendricks and I stood there[413] panting, and drawing in breaths of the Ertak's clean, reviving air.

[413]

"That possibility was one we overlooked, sir," said Hendricks. "Let's see what's happening."

We opened the shutter 

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