"You know what this is, Beany, old boy?" he said. "It's oil--for the pumps. It'll take the squeaks out of 'em for a while anyway. It won't last forever, but before it's gone, maybe you and I can figure out something else. Lucky I had this barrel left on the ship. There!" He stood up and dusted off his hands. "If we can get those pumps to stop chattering, we can open up the valves and let a _real_ head of water through to your pals. Be afraid to do it with the things in this condition." He unscrewed the cap and peered in, sniffing. He turned to the Martian with a broad grin. "About three-quarters full," he announced, marking the level on the outside of the drum with his hand. Peetn, deciding that the mystery had progressed just about far enough for his Martian tastes, stilted over and inserted his tube-like proboscis into the hole left by the screw cap, and inhaled. He straightened up abruptly and whistled, tears dropping from his yellow, sac-like eyes. Clark laughed excitedly. "That's oil, you Beanpole! We're going to rebuild Mars with that drum! You poor guys must have had a hell of a time living in this hole," he continued, becoming serious and pensive and indicating the desert with a wave of his hand. "It would take one of you a life-time to find food enough to live that long. Your civilization has sunk right down to rock bottom, but I think we're going to change all that." He shook his head doubtfully. "It's according to how long we can make this oil last. Those machines which your ancestors made are the real McCoy, all right, but God knows how long they've been pounding away dry as a bone. The oil might pour out of every crack as fast as we pour it in. Well," he finished, shrugging his shoulders, "there's only one way of finding out!" Carefully, lest he spill a drop of the priceless fluid, he filled a water container with the lubricant. "Keep your tentacles crossed!" he shot at Peetn, who looked down upon him from his superior height as the Earthman slowly poured the contents of his container into the oil-cup on the main bearing of No. 1 pump. He allowed the dregs to drain into the capacious pocket and then bent with hands on knees, looking for signs of a leak below. Peetn followed his every move tensely, wondering whether or not to force a halt to this tampering with the vital machines, but somehow he trusted this monster from Gamtl. He seemed to know what he was about, and there _was_ a chance that after he was through the disturbing noises in the machines would be gone. So he watched and waited, always on the alert to prevent any outright damage. He couldn't see, anyway, how pouring some of that evil-smelling stuff into those little cups would change anything.