This time as he turned he rolled to his feet. He saw the huge coils of the Venusian water-constrictor. One lidless phosphorescent eye gleamed evilly at him, but its great jaws were spread and the dead fish was half-way down its bone-plated throat. Grant Russell relaxed. Ordinarily he would have been scared to death to be within miles of the big saurian. But now for a few hours, with the fish in its throat it would be comparatively harmless. Grant rubbed his eyes and stretched. How wonderful sleep could be! For six weeks he had been in the swamp where he never had dared to take off his diving-suit even when he was resting on a clump of floating grass, for fear it would suddenly sink and drop him into a hundred feet of brown water; six weeks walking through mud sometimes over his head, with the brown, infested water above that; six weeks pitting all his swamp lore against sudden death in a thousand forms, with only the light gravity of Venus to aid him, and his indomitable determination to keep him going. But now he felt like a million. No man had ever crossed the Great Swamp alone on foot before. Few had crossed it in any fashion. Few would have tried it but Grant Russell because few wanted to do it as much as he did. In spite of his small size and his scrawny muscles, in spite of Venus which catered to big men and strong men, he had done it. * * * * * The food problem alone would have stopped most men, but Grant had spent a lot of time around the swamps of Venus. Often he had gone prospecting with food enough for only one week because he couldn't buy more, and he had stayed four, five, six weeks. To do that he had had to experiment. He'd eaten all sorts of things. Sometimes he had been ill but he had acquired immunity to certain poisonous plants that contained food values. The oxygen problem for a diving-suit for forty days would have stopped most men but Grant had solved that too. If he had not, he never could have gone to the Red Lava Range after the fabulous gizzard-stones of Venus's prehistoric echindul. For oxygen, he had discovered a plant that grew in the bottom of the swamp. You could cut its stalk into sections and put them in a container and they would exude oxygen for several hours. But he had to carry at least one extra stalk all the time, and he had to keep his eyes sharp for more. Sometimes it had been close. Grant looked at the Red Lava Range and felt the precious leather bag inside his shirt and smiled. Yes, he'd done it. He'd found one of the fabulous nests of the echindul--and it had been loaded with stones, just as ancient Venusian legend insisted. The extinct echindul had been a sort of flying lizard that had nested in the mysterious, almost inaccessible Red Lava Range. Every echindul had had two gizzard-stones, and each matched pair of stones had an unusual property.