The eruptions are irregular as to intervals. Black Warrior and Hurricane do a continuous performance. Constant pauses from twenty to fifty-five seconds between gushes. Grand is active at intervals of from one to four days, and Turban plays intermittently for twenty-four hours following Grand. Giantess rests from five to forty days at a time. Lioness played once in each of the years 1910, 1912, and 1914. Splendid, which formerly threw a ten-minute gush to a height of two hundred feet, has not played since 1892. There is equal variation in the duration of the gush. The Minute Man's activity lasts but from fifteen to thirty seconds. Giant stops work promptly at the end of an hour. Giantess, after her long rest, plays from twelve to thirty-six hours. The quantity of water erupted varies from a few gallons in the small geysers to thousands of barrels in the large ones. The water is generally thrown vertically, though some of the tubes lie at an angle. The Fan, as its name suggests, throws its water in a fan-like shape. Geysers vary in the height of their gush as in everything else, and the gush of each is seldom twice the same. Jewel varies from five feet to twenty, and Great Fountain from seventy-five to one hundred and fifty feet. The highest stream is thrown by Giant, which has a minimum of two hundred and a maximum of two hundred and fifty feet. Excelsior, which sometimes threw its water three hundred feet into the air, has not played since 1888. This geyser action is novel, picturesque, and weird. It appeals to the imagination. It goes on day and night, summer and winter, throughout the years. While many of the geysers are comparatively new, others are centuries old. Some may have been playing since prehistoric times. Old Faithful, in the Upper Geyser Basin, is in most respects the most wonderful geyser in the Park. Its action is almost uniform; its usual interval is seventy minutes. It plays for four minutes and sends its water up from sixty to one hundred and twenty feet. It gives ample warning before each play and gets into action by sending its water higher and higher with graceful ease. [Illustration: OLD FAITHFUL GEYSER YELLOWSTONE NATIONAL PARK] But in some particulars Great Fountain, in the Lower Geyser Basin, may be put at the head of the geyser list. Its waters issue from a vast low mound, and the basin has attractive ornamentation. It spouts an enormous volume of water, sometimes to a height of one hundred and fifty feet, and plays from forty-five to sixty minutes, at intervals of eight to eleven hours. Castle Geyser, in the Upper Geyser Basin, throws only a moderate gush about seventy-five feet in height, but it has built up a most imposing crater. It is quiet for from four to seven days; it then plays three or four times at half-hour intervals.