"Aye, sir!" The signal chief hastened to the blinker buttons and began to rap out the message. He was half through it when a dull boom echoed like a sigh through the control room. * * * * * Ross and Moore exchanged startled glances. Jorgens, white of face, looked up, his hand poised as if paralyzed over the buttons. Then Ross jumped to the rear telescope, which commanded a view of his following seven ships. There were only six. Where the seventh--the last in the staggered-line--should have been, a faint glow filled the air. Ross stared at it, heart-sick. Was that blow the last sign of his rear guard? A rocket ship blotted out--destroyed! But how? How? "Jorgens!" he snapped. "You had the Moon on the ray-type a while ago! Try to get that Peak One station again!" "Aye, sir," breathed Jorgens shakily. He tapped the black key, rattling the call signal feverishly, then snapped on the receiver. The prong-like type fingers made no move. "The ray-phone!" rasped Ross. The signal chief plugged the yellow cylinder into its gray socket, and flashed the light beside it. "First Fleet, calling Peak One!" he chanted. "Peak One, answer First Earth Fleet!" Ross, Moore and Jorgens held their breath. No sound came through the ray-phone trumpet. Jorgens lifted a gray face toward Ross. The fleet commander smiled wryly. "Let it go, Jorgens. Check all the batteries and connections before you try again." As Jorgens nodded and disappeared to trail the snaky coils of insulated ray-tubes to their battery reserves, Ross turned to Moore. "Number Eight's gone," he said softly. Moore blinked. "Gone? Where?" "Where the woodbine twineth," said Ross. Moore's breath came faster. "Wiped out?" He whipped off his spectacles and polished them absently, his jaw working on his half-forgotten chew of tobacco. "Gone," he muttered dazedly. A sudden thought struck Ross. He gripped his navigator's shoulder. "The stars! You said there was something funny going on!" Moore's eyes flashed. "Yes!" He slapped his glasses on. "Come on! Let me show you!" He led the way to the star-scope. Ross, following, stopped as a signalman approached with a typed message--the answer to the blinker call that Jorgens had started. The first sentence was short and blunt. "Number Two reports ray-type dead, ray-phone weak." Messages from the other five ships were identical except in the case of Number Seven. An added sentence from the last ship of the line stood out on the page and Ross felt sick inside as he read it. "Number Seven also reports explosion on right quarter where Number Eight was flying. No sign of Number Eight." * * * * * At the star-scope Moore hovered as Ross applied his eye to the powerful lens. "That's Denabola you're on." The navigator's jaw worked, his eyes glittering. "Dim," muttered Ross. "Clouds?" "No!" exploded Moore. "Denabola was bright as ever, then suddenly went dim!"