Bud had been clamoring to be allowed to raise some cattle "on his own," and his father had consented. Off to the north of Diamond X, and in a depression between the Snake Mountains on the east and Buffalo Ridge on the west, was another valley, well sheltered from the wintry blasts. This valley was owned by Mr. Merkel, and though part of it was timbered, and some scattered sections produced an excellent variety of grass for stock, there was no dependable source of drinking water available. And without water at hand it is impossible to raise cattle in the west--or any place else, for that matter. How to get water to "Flume Valley," as it came to be called, was a problem. It would have been put to use raising cattle long before this had Mr. Merkel been able to get any water there for the animals to drink, and also some to irrigate the more arid portions so that fodder would grow. At the foot of the eastern slope of Snake Mountains ran the Pocut River, which served to supply not only Diamond X, Square M and Triangle B ranches with water, but also those of Double Z and Circle T, the respective holdings of Hank Fisher and Thomas Ogden. But though Pocut River gave plenty of water to Bud's father and the other ranchmen, none was available for the isolated valley which, except for this, would have been an ideal place to raise steers. And it was here that the good services of Professor Wright, one of the scientists mentioned in the first volume, came into play. For Professor Wright discovered an ancient underground water course, connecting with Pocut River, and when this had been partly tunneled, re-opened at places where it had caved in, and a big iron pipe laid part of the way, water came gushing out into Flume Valley, as Bud renamed the place, it having been called Buffalo Wallow before that time; probably when there was water in it and the buffalo made it a rendezvous. And when the water came through the iron pipe, falling into the reservoir that had been built to hold it in reserve, Bud was allowed to begin his experiment in stock raising. His father provided him with the cattle, and Bud was a boy rancher in reality now. His cousins had agreed to help him in the venture on their arrival, and Bud had been expecting them when he rode out with Old Billee that day. Old Billee was one of the Diamond X cowboys, and he might have been made a foreman, except that he had no executive ability. He could do as he was told, and that was about all. He was reliable and dependable, but had no initiative for big undertakings. Old Billee, with Buck Tooth and some other cowboys, had been assigned to help Bud in his venture. As Bud has told his cousins, when he rode to meet them at the water-hole, on the trail from Diamond S ranch, there was no time, yet, to construct ranch houses in Flume Valley. Tents would have to serve the purpose, and the boys were rather pleased, than otherwise, with this. "It will be just like camp!" said Bud.