Death Gulch Data from E.T. Seton's "Lives of Game Animals, Vol. II., Part I. p.75. "Death Gulch is a well-known, small and gloomy ravine in the northeast corner of Yellowstone Park. Into this the wild thing are tempted by promise of food, water, and shelter. But they are led into a bath of invisible poisonous vapor in which each, in turn, sinks down to sleep his last sleep." "Twice it has been investigated by members of the US Geological Survey. In 1888 Walter H. Reed visited the place and wrote an account of it for Science, Feb. 15, 1899. After commenting on the volcanic origin of the gulch formation, he says: "Although no hot water no longer flows from these vents, gaseous emanations are now given off in considerable volume." Arnold Hague, his chief, was successful in obtaining evidence of the presence of carbonic dioxide gas in these emanations. Reed says: "The gulch ends, or rather begins, in a scoop or basin about 250 feet above Cache Creek - " p.76" The hollows were tested for carbonic acid gas with lighted tapers, without proving its presence, but the strong smell of sulphur and a choking sensation of the lungs, indicated the presence of