Freezing Lava Beds near Medicine Lake, Siskiyou County, Northern California. (M. S. Baker, _Sierra Club Bulletin_, 1899. Vol. II., page 318.)--"One other feature of the lava region must be mentioned--the ice caves. There are several of these known, and very likely many more remain undiscovered. Those located along the edge of the lava, near the cinder cone, I have known to contain ice and water as late as August. The largest I have seen is on the Mayfield Road, about twenty miles east of Bartles. It is situated in the barren lava, and in one of the warmest localities of the region,--and there are few cool spots in the lava anywhere. One enters the cave by crawling down a hole none too large. The instant the interior is reached the temperature falls in a surprising way. Not more than ten feet below the surface of the hot rocks is a bed of ice, covered by a foot or so of ice water. The body of ice was perhaps twelve or fifteen feet long, by five feet across in the widest places. This cave is formed by a fissure that extends a distance of twenty miles from the ice cave to Pittville, and nearly coincides with the 4000 foot level, as shown in the map. Along the southeastern half of this earth fissure the southwest wall has faulted, leaving a cliff, which, in places, must be nearly 200 feet high." Freezing Shafts, Montana.--Mr. Robert Butler, of San José, Cal., has given me much information about glacières in Montana. He visited one miners' shaft which is situated about 80 kilometers up the Rosebud River from Rosebud Station on the Northern Pacific R. R., and about 10 kilometers northeast of the Cheyenne Indian Agency. It is on the north slope of the Little Wolf Mountains, near the summit, at the head of Greenleaf Creek. The canyon and surrounding slopes are covered with a dense growth of pine. The rock has the appearance of scoriæ caused by the burning of immense beds of coal in recent geological times. The rock is broken into comparatively small pieces. The altitude is some 1200 meters. The forest, the volcanic ash and the altitude, besides the loose rock formation, makes this place a natural ice house. Ten or twelve years ago three prospectors, looking for silver, sunk a shaft here. At a depth of about 4 meters it began to grow cold, and at 6 meters they found ice and imagined they could feel an upward draught. Being ignorant and superstitious, they became frightened and abandoned the shaft. During the winter, the snow fills the shaft half full of ice, which then remains over through the summer. There is a general report and belief among those who have visited the well, that it freezes in summer and thaws in winter. There are thousands of mining shafts in Montana, and if they are on the north slope of a mountain of considerable altitude and under a dense forest and not too deep, they generally have ice at the bottom during the summer. It is also said to be nothing new for a miner in following crevices to find them