"Right, sir!" said my third officer grimly.

Correy muttered under his breath, something which sounded very much like profanity, but I let it pass.

I knew just how he felt.

I have never liked to wear a breathing mask. I feel shut in, frustrated, more or less helpless. The hiss of the air and the everlasting flap-flap of the exhaust-valve disturb me. But they are very handy things when you walk abroad on a world which has no breathable atmosphere.

You've probably seen, in the museums, the breathing masks of that period. They were very new and modern then, although they certainly appear cumbersome by comparison with the devices of to-day.

Our masks consisted of a huge shirt of air-tight, light material which was belted in tightly around the waist, and bloused out like an ancient balloon when inflated. The arm-holes were sealed by two heavy bands of elastic, close to the shoulders, and the head-piece was of thin copper, set with a broad, curved band of crystal which extended from one side to the other, across the front, giving the wearer a clear view of everything except that which was directly behind him. The balloon-like blouse, of[412] course, was designed to hold a small reserve supply of air, for an emergency, should anything happen to the tank upon the shoulders, or the valve which released the air from it.

[412]

They were cumbersome, uncomfortable things, but I donned mine and adjusted the menore, built into the helmet, to full strength. I wanted to be sure I kept in communication with both Hendricks and the sentries at the air-lock exit, and of course, inside the helmets, verbal communication was impossible.

I glanced at Hendricks, and saw that he was ready and waiting. We were standing inside the air-lock, and the mighty door of the port had just finished turning in its threads, and was swinging back slowly on its massive gimbals.

"Let's go, Hendricks," I emanated. "Remember, take no chances, and keep your eyes open."

"I'll remember, sir," replied Hendricks, and together we stepped out onto the coarse gravel of the beach.

Before us, waves of an unhealthy, cloudy green rolled slowly, heavily shoreward, but we had no eyes for this, nor for the amazing vegetation of the place, plainly visible on the curving shores. We took a 

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