In January, 1917, I made a trip by sleigh, drawn by a pair of sturdy horses, to the bison corral. On the hills at intervals along the entire route large bands of elk were to be seen. The snow was more than two feet deep, and it required two days, mostly at a walk, to travel the thirty-five miles between Gardiner and the corral. The thermometer registered from ten to fifteen degrees below zero, and for the week following the mercury ranged, in the morning, from thirty-two to fifty degrees below. In winter the bison are kept in a large pasture-corral a square mile in extent, lying along Rose Creek and Lamar River, and here they remain very contentedly. Long before daylight each morning the herd congregates about the corral gate, waiting for feeding-time. Soon after daylight a sleigh is driven into the inclosure, loaded with alfalfa hay and drawn by a pair of horses that have become so accustomed to the buffalo as to pay no attention to them, even though the latter crowd close about them. The hay is pitch-forked to the ground as the sleigh is slowly driven along, and the animals line themselves out, following it until all are supplied. In an hour or two, after they have eaten their fill, they "mosey" over to the steaming creek that has its sources in some hot springs in the hills, drink slowly and long, and then sedately walk back along deep trails in the snow, the mother bison followed by their calves, to the feeding-ground, where most of them then lie down and sleep for a good part of the day. Mock fights or hunting jousts are indulged in by some of the younger animals and afford variety and amusement, to the participants at least. In the dim light of a winter morning the animals resemble a herd of young elephants. Reference has been made to the fact that this particular locality is especially interesting from a geographical standpoint. Including the Jackson Lake country it is in this respect one of the most important and interesting regions on the continent. It lies on both sides of the great Continental Divide, which twists and turns in all directions in its course northward and southward. Outside of the limits of Yellowstone Park itself, the mountain structure found here is, perhaps, not greatly different from that of other parts of the Rockies. The Teton range lies south of the park, and is one of the most prominent and commanding in the entire Rocky Mountain chain. The park region itself seems to be a vent for the pent-up heat of the earth. It is not improbable that these boiling springs and geysers may serve as escape-valves, and be the means of preventing very serious volcanic disturbances, such as occurred here in past ages.