Mammoth Hot Springs. July 21-24, 1871 No. 224. AN OBLONG FISSURED RIDGE, of about 150 yards in length, six to ten feet high, and from ten to fifteen broad at the base. The fissure runs from one end to the other, and is from six to twelve inches wide, from which steam issues in considerable quantities. The inner portion of the shell is lined with a hard, white enamel like porcelain, covered with beautiful crystals of sulphur that have been gathered from the surging and seething cauldron of sulphurated steam rising from it.

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