"And that is the mystery?" asked Tad. "Yes." "It is the strangest story I ever heard," said the boy quietly. "What I was about to say, is that the herd will go on without me. Colonel McClure is sending his own foreman through with it instead. Ruth and I are to be married at once, and we shall go to my little ranch in Montana." In view of the fact that Stallings was severing his connection with the herd, Professor Zepplin decided to do likewise. Next morning, at sunrise, Bob Stallings, with Miss Ruth, by his side, both radiantly happy, rode out to the camp. The Pony Rider Boys had packed their kits and loaded their belongings on their ponies. Regretfully they bade good-bye to the cowmen. Tad's parting with Big-foot was most trying. In the short time they had been together, a strong affection had grown up between the two. The plainsman had been quick to perceive Tad's manly qualities, and the boy, in his turn, had been won by the big, generous nature of the man. They parted, each vowing that they must see each other again. As the great herd moved slowly northward, three cheers were proposed for Bob Stallings and Miss Brayton. This the cowboys gave with a will, adding a tiger for the Pony Rider Boys. The trail wagon, pulling out at the same time, held a grinning Chinaman, huddled in the rear. "Good-bye, Pong!" shouted the lads. "Allee samee," chuckled the cook, shaking hands with himself enthusiastically. And here for a time we will take leave of the Pony Rider Boys, whose further exciting experiences will be chronicled in the next volume, entitled: "The Pony Rider Boys in Montana; Or, the Mystery of the Old Custer Trail." This will be a story of adventure, full of absorbing interest and thrilling incidents. The reader will then go over the same trails that General Custer rode in the wilder days. The End. * * * * * HENRY ALTEMUS COMPANY'S CATALOGUE OF The Best and Least Expensive Books For Real Boys and Girls THESE FASCINATING VOLUMES WILL INTEREST BOYS AND GIRLS OF EVERY AGE UNDER SIXTY Sold by all booksellers or sent postpaid on receipt of price Henry Altemus Company 507-513 CHERRY STREET PHILADELPHIA The Motor Boat Club Series By H. Irving Hancock The keynote of these books is manliness. The stories are wonderfully entertaining, and they are at the same time sound and wholesome. The plots are ingenious, the action swift, and the moral tone wholly healthful. No boy will willingly lay down an unfinished book in this series, at the same time he will form a taste for good literature and the glory of right living. The Motor Boat Club of the Kennebec; Or, The Secret of Smugglers' Island. The Motor Boat Club at Nantucket; Or, The Mystery of the Dunstan Heir. The Motor Boat Club off Long Island; Or, A Daring Marine Game at Racing Speed. The Motor Boat Club and the Wireless; Or, The Dot, Dash and Dare Cruise.