"Yes, this is Phil. Come here, Phil and meet my young friends."

The Pony Rider Boys took to the lad at once. He was a manly little fellow, but delicate to the point of being fragile, the lad having only recently recovered from a serious attack of typhoid fever.

"You see what the outdoor life has done for these young gentlemen, Phil," said Mr. Simms. "I shall expect you to come back this fall, looking every bit as well as they do now. All get ready for dinner. It will be served in a few moments. Later in the day, we shall move out on the range. Phil, have you packed up your things?"

"Yes, sir. I'm all ready."

The noon meal was a jolly affair. The herders cooked their own meals out on the range, and after this the boys would eat with them. But to-day they were invited guests in the home of the rancher and hanker. In the meantime Professor Zepplin and Mr. Simms had become interested in each other and already were looking forward to the next few days on the range together, with keen pleasure.

The start was made shortly after three o'clock, the party reaching their destination well before sundown.

The Pony Riders uttered a shout as they descried the white canvas top of the chuck wagon. It was a familiar sight to them. On beyond that was a perfect sea of white backs and bobbing heads, where the great herd was grazing contentedly after its long journey to the free grass of Montana. The boys had never seen anything like it.

The sheep dogs, too, were a source of never-ending interest. The boys watched the intelligent animals, as of their own accord they rounded up a bunch here and there that they had observed straying from the main herd, working the sheep back to their fellows quietly and without in the least appearing to disturb them.

"What kind of sheep is that over there?" asked Chunky, pointing.

"That's no sheep. That's Billy," answered Mr. Simms.