As he had said, there had been no further outbreak of the epidemic among the cattle of the boy ranchers. The steers which Pocut Pete had cut, injecting into them the pus and germs, died, however. And there were more of these than Bud and his cousins had counted on.

But if they lost no more than this half-score, and could get the water back, all might yet be well.

The water in the reservoir had gone down several feet when the expedition started into the tunnel. Much of the fluid had to be drawn off to water the thirsty cattle, for it was the height of summer now, and the heat, in the middle of the day, was terrific.

But there was still enough of the supply to last for several days. Then, if Bud and his companions could not discover the secret of the stoppage, and get the water to running again. Flume Valley would have to be abandoned.

"Well, I can't see that we can do any more," spoke Bud.

"No; you've got things as well fixed as possible," agreed Old Billee.

"Can't tell when you'll see us again," said Dick to the remaining cowboys gathered about the reservoir end of the tunnel to see the expedition start in.

"Well, good luck, anyhow!" came the answer.

A number of punchers had been sent over to Flume Valley from Diamond X and Triangle B to replace Yellin' Kid, Billee and Snake Purdee who were to accompany the boy ranchers.

Suddenly Yellin' Kid broke into song: