About one thirtieth of the new State of Wyoming—the extreme northwest corner—is reserved by the United States Government for the “Yellowstone National Park.” Nearly the whole area thus set apart remains a virgin wilderness, traversed only by rough and narrow carriage roads, and hardly affording shelter to the increasing number of tourists each summer in its hastily erected hotels. The whole park is about the size of Rhode Island and Delaware combined.

The Government, through the Secretary of the Interior, has issued certain regulations regarding the conduct of travelers in the park. These relate chiefly to camping, destroying trees, etc. One of the most stringent rules forbids the discharge of firearms within the limits of the Reservation. Mounted soldiers of the regular United States Army are scattered all through the park, doing police duty; and if you are caught firing a gun, or even having one (unsealed) in your possession, good-by to your fowling-piece and good-by to the park. The former is at once confiscated, and you are marched out of the latter without ceremony. Those travelers who wish to take firearms are obliged to have the lock sealed by a Government official, at the entrance of the park.

The result of this wholesome regulation is that wild game of all sorts is on the rapid increase, in this favored spot. About one hundred and fifty buffalo, the remnant of the immense herds that once roamed the Western prairies, are peacefully quartered somewhere among these wild hills—nobody knows exactly where.

Most of these facts Tom hastily repeated to his companions in the “Broadwater,” as the dining-car was called. The ride over to Mammoth Hot Springs was full of interest, the road following a wild mountain-stream, and finding its way farther and farther into the wilderness.

At one point an exclamation from Randolph called the attention of the rest to an eagle’s nest on a jutting cliff that almost overhung the road. The heads of the young eagles could be plainly seen over the edge of the nest, and far overhead soared the parent birds.

On making up the wagon parties at the hotel, the Percivals found to their delight that all could go in one team, including Mr. and Miss Selborne. Off they went with shouts and cheers, leaving the wonders of the “Mammoth” district for their return trip.

Up and up, along the edge of frightful precipices, where the road was built of planking, with great props, sheer out around promontories of rock; up and up, to the high tablelands of the park; through evergreen forests, along silent lakes, haunted by beavers and strange water-fowl; beside black cliffs of volcanic glass, or “obsidian”; across unbridged streams where the horses plunged into the swift-running waters, and the wagon lurched from side to side, hub-deep in the flood. So onward until they had covered twenty-two miles, and reached the Norris Geyser Basin, where dinner was served in a long, shed-like structure called a hotel.

As soon as the meal was over, the young people hurried ahead on foot, to see their first geysers. A quarter of a mile walk, and a sudden turn of the road brought them into view. Strange, uncanny things they were, bursting upward at intervals through the treacherous and chalk-like “formation,” and throwing their jets of steaming water into the air with hollow gurgles and growls from their hot throats.

The atmosphere was charged with sulphurous odors, and while the travelers were fascinated with the novelty and mystery of the scene, they were glad to enter their wagons once more and press forward on their journey. They all felt the rarity of the air, being about a thousand feet higher than the summit of Mt. Washington, above the level of the sea. It became very cold, too, as the sun went down. The girls were glad to don their sealskin capes, and the boys turned up their coat-collars.

Eighteen miles over the wildest country they had yet seen, brought them to the Lower Geyser Basin.