Dio the Martian came down the furrow, his lean, wiry figure silhouetted against the upper panorama of the valley; the neat rows of vegetables and the green riot of Venusian wheat, dotted with toiling men and their friendly guards.

Dio's green, narrowed eyes studied Gray's hard face.

"What's the matter, Gray? Trying to start something?"

"Suppose I were?" asked Gray silkily. Dio was the unofficial leader of the convict-veterans. There was about his thin body and hatchet face some of the grim determination that had made the Martians cling to their dying world and bring life to it again.

"You volunteered, like the rest of us," said the Martian. "Haven't you the guts to stick it?"

"The hell I volunteered! The IPA sent me. And what's it to you?"

"Only this." Dio's green eyes were slitted and ugly. "You've only been here a month. The rest of us came nearly a year ago—because we wanted to. We've worked like slaves, because we wanted to. In three weeks the crops will be in. The Moulton Project will be self-supporting. Moulton will get his permanent charter, and we'll be on our way.

"There are ninety-nine of us, Gray, who want the Moulton Project to succeed. We know that that louse Caron of Mars doesn't want it to, since pitchblende was discovered. We don't know whether you're working for him or not, but you're a troublemaker.

"There isn't to be any trouble, Gray. We're not giving the Interplanetary Prison Authority any excuse to revoke its decision and give Caron of Mars a free hand here. We'll see to anyone who tries it. Understand?"