small room with a dome of shatter-proof glass; a pilot who sat there to look in all directions, a control-board beneath his hands. Beside him on his elevated station was room for Captain Blake, and McGuire and Althora, too. The ship was climbing swiftly. McGuire saw where flashing shapes circled and roared in a swelling cloud of smoke and gas.

Blake spoke sharply to an aide: "General orders! All ships climb to resume formation!"

An enemy ship was before them: it flashed from nowhere to bear down with terrific speed. The floor beneath them shook with the jarring of heavy guns, and McGuire saw the advancing shape bursting with puffs of smoke, while their own ship shot upward with a sickening twist. A silver ship was falling!—and another!

"Two more of ours gone," said Captain Blake through set teeth. "How many of them are there, Mac? Tell me what you know: we've got a hell of a fight on our hands."

"They're all here," McGuire told him, in jerky, breathless speech. "These are transports on the ground. Their weapons are gas and speed, and the rams on their beaked ships. There are other weapons—deadlier ones!—but they haven't got them: they belong to another race. I'll tell you all that later!"

"Keep them at a distance, Blake," he said. "Make them come to you—then nail them as they come."

"Right!" was the answer; "that's good dope. We didn't know what they had; expected some devilish things that could down us before we got within effective range; had to mix it with them to find out what they could do, and get in a few solid cracks before they did it.

"How high are we?" He glanced quickly at an instrument. "Ten thousand. Order all ships to withdraw," he instructed his aide. "Rendezvous at fifty thousand feet for echelon formation."