"If _we_ found rats coming from a rat-hole," said Tommy very quietly, "and ferrets went down and didn't come up, we'd gas them." "And so," Denham told him, "so would the Golden City." He pointed to a boxed double paragraph news story under leaded twenty-point headline: "Poisonous Fog Kills Wild Life." The story was not alarming. It said merely that state game wardens had found numerous dead game animals in a thinly-settled district near Coltsville, N.Y., and on investigation had found a bank of mist, all of half a mile across, which seemed to have caused the trouble. State chemists and biologists were investigating the phenomenon. Curiously, the bank of mist seemed not to dissipate in a normal fashion. Samples of the fog were being analyzed. It was probably akin to the Belgian fogs which on several occasions had caused much loss of life. The mist was especially interesting because in sunlight it displayed prismatic colorings. State troopers were warning the inhabitants of the neighborhood. "The gassing's started," said Denham savagely. "I know a gas that shows rainbow colors. The Golden City uses it. So we've got to find Jacaro's Tube and seal it, or only God knows what will come out of it next. I'm going off, Tommy. You and Smithers guard our Tube. Blow it up, if necessary. It's dangerous. I'll get some authority in Albany, and we'll find Jacaro's Tube and blast it shut." Tommy nodded, his eyes keen and thoughtful. Denham hurried out. * * * * * Minutes later, only, they heard the roar of a car motor going down the long lane away from the laboratory. Evelyn tried to smile at Tommy. "It seems terrible, dangerous." Tommy considered and shrugged. "This news is old," he observed. "This paper was printed last night. I think I'll make a couple of long-distance calls. If the Golden City's had trouble with Jacaro, it's going to make things bad for us." He swept his eyes about and frowningly loaded a light rifle. He put it convenient to Evelyn's hand and made for the dwelling-house and the telephone. It was odd that as he emerged into the open air, the familiar smells of Earth struck his nostrils as strange and unaccustomed. The laboratory was redolent of the tree-fern forest into which the Tube extended. And Smithers was watching amid those dank, incredible carboniferous-period growths now. Tommy put through calls, seeing all his and Denham's plans for a peaceful exploration party and amicable contact with the civilization of that other planet, utterly shattered by presumed outrages by Jacaro. He made call after call, and his demands for information grew more urgent as he got closer to the source of trouble. His cause for worry was verified long before he had finished. Even as he made the first call, New York newspapers had crowded a second-grade murder off their front pages to make room for the white mist upstate. * * * * *