Madsen was hastily dumping the contents of the knapsacks on the ground. Morley joined him, and both men commenced scraping the clinging gray patches from the tins. All but three were perforated and ruined. "We'll at least be traveling light from now on," Madsen said. "Any idea what this stuff is?" "Some of that lichen, or whatever it is, was around the scene of the crash," Morley answered. "The stuff must have an affinity for tin; probably secretes some acid that dissolves it. Only trouble is, it goes through thin steel too." Madsen commenced repacking their effects. "From now on, laddie, keep your eyes peeled for game, and if you see any, use that rifle. If we don't knock down some meat, and soon, we aren't going to make it. Might as well realize it right now." "Were you ever wrecked before, Madsen?" "Once, on Venus. Cartographic expedition." "What happened?" "Tubes blew and we made a forced landing. Wound up sitting in the middle of a pile of highgrade scrap." "What did you do then?" Madsen shouldered his knapsack and smiled condescendingly. "Not a thing, Mr. Fix-it. We didn't have to. Since I seem to have accidentally stumbled on something new and strange to you, add this to your files. It's usual on cartographic trips of any length, for one ship to go out, while another stays at a temporary base, and keeps in constant directional radio contact. If anything happens, they come a-running. Makes it fine for us uninformed common people." "Oh." "Of course, this is somewhat different. If we don't get out by ourselves, whoever finds us need only say, 'X marks the spot.'" Morley didn't bother answering. No comment was necessary. He knew as well as Madsen that whatever margin of safety they possessed had been shaved to the vanishing point. * * * * * They made twenty miles in a forced march, slept, ate, and then traveled again. The stunted forest grew thinner, and occasionally they crossed open spaces acres in extent. Twice they saw, in the distance, animals resembling terrestrial deer, and on the second occasion Morley tried a fruitless shot. They slept and ate again, and now the last of the rations were gone. They went on. As they made southing, the dull sun crept higher in the sky by infinitesimal degrees. Now the going became tougher. Patches of evil looking muskeg began to appear in the scrub, and the stunted trees themselves gradually gave way to six foot ferns. There were occasional signs that some creature had been foraging on the lush growth. When they found fresh tracks in the soft footing, Morley unlimbered the rifle, and the two men trod more softly. By that time either would have cheerfully made a meal on one of the miniature flying dragons, alive and kicking, and the thought of a juicy steak from some local herbivore was as soul stirring as the sight of Mecca to a true believer.