With the new order of travel began a new conception of the Yellowstone's public usefulness. It ceased to be a museum of wonders and began to be a summer pleasure-ground. Instead of the fast automobile-stage decreasing the average length of visit, the new idea which it embodied has lengthened it. This new idea is a natural evolution which began with the automobile and spread rapidly. The railroads had been bringing tourists principally on transcontinental stop-overs. Automobiles brought people who came really to see the Yellowstone, who stayed weeks at public camps to see it, or who brought outfits and camped out among its spectacles. The first Ford which entered the park on the morning of August 1, 1915, the day when private cars were first admitted, so loaded with tenting and cooking utensils that the occupants scarcely could be seen, was the herald of the new and greater Yellowstone. Those who laughed and those who groaned at sight of it, and there were both, were no seers; for that minute Yellowstone entered upon her destiny. The road scheme is simple and effective. From each entrance a road leads into an oblong loop road enclosing the centre of the park and touching the principal points of scenic interest. This loop is connected across the middle for convenience. From it several short roads push out to special spectacles, and a long road follows Lamar Creek through a northeastern entrance to a mining town which has no other means of communication with the world outside. This is the road to Specimen Ridge with its thirteen engulfed forests, to the buffalo range, and, outside the park boundaries, to the Grasshopper Glacier, in whose glassy embrace may be seen millions of grasshoppers which have lain in very cold storage indeed from an age before man. All are automobile roads. II The hot-water phenomena are scattered over a large area of the park. The Mammoth Hot Springs at the northern entrance are the only active examples of high terrace-building. The geysers are concentrated in three adjoining groups upon the middle-west side. But hot springs occur everywhere at widely separated points; a steam jet is seen emerging even from the depths of the Grand Canyon a thousand feet below the rim.