A shout of savage exultation broke from my lips. Hardly, had the flame touched the glass before it cracked! There was a report like a pistol shot--and a miniature Niagara of water and splintered glass poured at my feet! The tentacle around my arm tightened, then relaxed. The monster shuddered in a convulsive heap on the ground. I went toward the next one, swinging the flaring hose in a slow arc as I advanced. The creature lunged at me and threshed at the burning jet with all four of its feelers. But it had been exposed to the air for a long time now. The ghastly tentacles were dry; withered and soft. A touch of the fire seared them unmercifully. Nevertheless with a swift move it slapped a tentacle squarely down over the hose nozzle. The flame was extinguished as the flame of a candle is pinched out between thumb and forefinger. I retreated. "Catch!" came a voice behind me. * * * * * The Professor swung his four-foot jet my way. I held my hose to it, and the flame burst out again. A touch at my grisly antagonist's helmet--a sharp crack--the welcome rush of water over the cream-colored grass--and another monster was writhing in the death throes! Keeping close together, the three of us faced the massed Quabos in the palace grounds. Again and again the fiery weapon of one or the other of us was dashed out--to be re-lighted from the nearest hose. Again and again loud detonations heralded the collapse of more of the invaders. But it seemed as though their flailing tentacles were as myriad as the stars they had never seen. It seemed as though their numbers would never appreciably diminish. We thrust and parried till our arms grew numb. And still there appeared to be hundreds of the Quabos left. By order of the Queen three stout Zyobites stepped up to us and relieved us of our exhausting labor. Gladly we handed the hoses to them and went to the palace for a much needed rest. * * * * * Two more shifts of fighters took the flaming jets before the monsters began the retreat slowly back toward their tunnel. And here the Professor took command again. "We mustn't let them get away to try some new scheme!" he snapped. "Martin, take fifty men and beat them back to the break in the wall. Go around a side street. They move so slowly that you can easily cut off their retreat." "There isn't any more hose--" began Stanley. "There's plenty of it. The Quabos brought it with them." The Professor turned to me again. "Take metal-saws with you. Cut sections of the Quabos water-hose and connect them to the nearest wall jets. Run!" I ran, with fifty of the men of Zyobor close behind me. We dodged out the side of the palace grounds least guarded by the Quabos, ducking between their ranks like infantry men threading through an opposition of powerful but slow-moving tanks. Four of our number were caught, but the rest got through unscathed.