. Diary of the Washburn Expedition to the Yellowstone and Firehole Rivers in the year 1870. thick Avith lead-colored sulphury slime. There are five large springs and half a dozen smaller onesin this basin, all of them strongly impregnated with sul-phur, alum and arsenic. The water from all the largersprings is dark brown or nearly black. The largest springis fifteen to eighteen feet in diameter, and the w^ater boilsup like a cauldron from 18 to 30 inches, and one instinctive-ly draws back from the edge as the hot sulphur steamrises around him. Another of the larger springs is inter-mittent. Th
. Diary of the Washburn Expedition to the Yellowstone and Firehole Rivers in the year 1870. thick Avith lead-colored sulphury slime. There are five large springs and half a dozen smaller onesin this basin, all of them strongly impregnated with sul-phur, alum and arsenic. The water from all the largersprings is dark brown or nearly black. The largest springis fifteen to eighteen feet in diameter, and the w^ater boilsup like a cauldron from 18 to 30 inches, and one instinctive-ly draws back from the edge as the hot sulphur steamrises around him. Another of the larger springs is inter-mittent. The smaller springs are farther up on the bankthan the larger ones. The deposit of sinter bordering one Washburn Yelloavstone ExrEDiTiON of 1870. 25 of them, with the emission of steam and smoke combined,gives it a resemblance to a chimney of a miners them all is an incrustation formed from the bases ofthe spring deposits, arsenic, alum, sulphur, etc. This in-crustation is sufficiently strong in many places to bear theweight of a man, but more frequently it gave way, and from. SECURIN^G A SPECIMEN AT Hell-Broth Springs. the apertures thus created hot steam issued, showing it tobe dangerous to approach the edge of the springs; and itwas with the greatest difficulty that I obtained specimens ofIhe incrustation. This I finally accomplished by lying atfull length upon that portion of the incrustation whichyielded the least, but which was not sufficiently strong tobear my weight while I stood upright, and at imminent riskof sinking in the infernal mixture, 1 rolled over and over to 20 Washburn Yi<]lloavstoxe Expedition of 1870. the edge of the opening; and, with the crust slowly bendingand sinking beneath me, hurriedly secured the covetedprize of black sulphur, and rolled back to a place of safety. From the springs to the mouth of the creek we followedalong the bank, the bed or bottom being too rough and pre-cipitous for us to travel in it, the total fall in the creek
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