We were gathered in Grantline's instrument room. The duty-man, with blanched grim face, sat at his senders. The Grantline crew shoved close around us, tense and silent.

Above everything we must make some Earth station aware of our plight. Conditions were against us. There were very few observers, in the high-powered Earth stations who knew that an exploring party was on the Moon. Perhaps none of them. The Government officials who had sanctioned the expedition—and Halsey and his confrères in the Detective Bureau—were not anticipating trouble now. The Planetara was supposed to be well on her course to Ferrok-Shahn. It was when she was due to return that Halsey would be alert.

And it seemed, too, that nature was against us. The bulging half-Earth[1] hung poised near the zenith over our little crater. Its rotation through the hours was clearly visible. We timed our signals when the western hemisphere was facing us. But nature was against us. No clouds, no faintest hint of mist could fog the airless Lunar surface. But there were continuous clouds over the Americas.

[1] Between the half and the full illumined disc, the complete Earth now was some ten days old.

"Try it again," Snap urged.


hese bulging walls! Grantline used his power far beyond the limits of safety. He cut down his lights; the telescope intensifiers were permanently disconnected; the ventilators were momentarily stilled, so that the air here in the little room crowded with men rapidly grew fetid. All to save power pressure, that the vital Erentz system might survive.

Even so it was strained to the danger point. The walls seemed to bulge outward with the pressure of the room, the aluminite braces straining and creaking. And our heat was radiating away; the deadly chill of space crept in.

"Again!" ordered Grantline.