If any doubt remained in his mind, it was shattered irretrievably when Leslie showed him the mining operations. Thus far, they had begun only on an experimental basis, the Tellurians wisely wary of extending themselves before permission to remain was granted by the Laurr. But, even on a small scale, what Telis saw stirred him more deeply than had any of the other wondrous things he had been shown. Since the deserts of Laurr were almost pure iron oxide, it was explained to him that they were the result of the ubiquitous iron's propensity for uniting with oxygen. The result, after many aeons, was that the air was actually rusting away. By the marvelous miracle of Tellurian chemistry, the iron oxide was broken down into its constituent elements. This resulted in a stream of iron ingots, and ... free oxygen! Telis was quick to realize what this process would mean to Laurr over a period of time if it was made universal. Great quantities of the precious oxygen would be released into the air to revitalize it, and later to combine with the large amounts of hydrogen in Laurr's atmosphere to form water! The Tellurians had in fact already set up a pilot plant where oxygen and hydrogen were mixed to make the water they needed for their own purposes. Part of it was used for drinking and bathing, and part was used for puddling the iron oxide before it was passed through the separation process. Great pressure hoses washed the impurities from the ferric oxide even as Telis watched, astounded. Never had a Laurrian seen precious water treated so carelessly, but with a great effort he was able to acclimate himself finally to an economy of plentiful water, and the sight of great streams of it churning the desert to reddish mud shocked him less and less as the days passed. Only two thoughts marred Telis' happiness during these days spent in the camp. First the thought of Gorla's fate remained with him always, and he resolved that his friend's sacrifice should not be for nothing. And, second, there was the Maldia. Now, with Prince Brand at its head, it was more than ever a threat to the safety of the people from the third planet, to himself, to the Laurr and by extension to the world of Laurr itself. Telis resolved that he must return immediately to the capital and lay his findings before the Laurr. Only in that way could the danger of the Maldia be removed. With the safe-conduct from the supreme ruler confirmed publicly, the Maldia would not dare to attack the camp. The air-sled was repaired, and Telis made ready to leave the following morning over the protests of Leslie and the camp medical staff who contended that his wound was not yet sufficiently healed. But Telis' resolution had come too late. Even as the sled was loaded, a shout from the watchtower brought the whole camp out into the streets. With sinking heart Telis heard the words of the camp guard. The Maldia had come, and the camp found itself surrounded. VI