154 EEPORT" UNITED STATES GEOLOGICAL SUEVEY. 



and when the latter is in operation the water spurts from it into this 

 orifice and ihe overflow pours from it into a depressed basin in old gray 

 geyserite, Just to the east close to it. At the west end, at the foot of the 

 cone, is a white-lined, shallow basin, in which the water has a depth of 

 an inch. In this basin, near the cone, is a bowl measuring 3 by 4 feet, 

 from wliich the water is continuously spouting and bulging, sometimes 

 reaching a height of 5 or 6 feet. This bowl has periods of quiescence 

 which appear to be independent of those in the main geyser, spouting 

 sometimes when the latter is quiet and sometimes when it is in action. 

 The temperature in this pool is 192° F. The entire length of the geyser, 

 including the pool and the depressed hole, is 45 feet. The main cone 

 spouts in a spasmodic manner with vigorous spurts which reach a height 

 of 10 to 25 feet, and even 30 feet at times. On October 1 it was in action 

 from two o'clock until half-past four. How long before this it had been 

 spouting I cannot tell, nor how long it lasted after I left. At 11.30 a. m, 

 on the 2d it was spouting as when I left it the previous evening, and it 

 was still in action when I left, at 1.40 p. m. In six minutes there were 

 38 spurts, which is an average of one about every 10 seconds. The in- 

 tervals were from 3 to 26 seconds, the longer intervals being at about 

 every seventb one. Professor Comstock gives the interval as about 

 every 3 minutes. The geyser was in action constantly during his visit 

 to it (a period of about two hours and a half). On October 5, when I 

 noted an eruption of the Fountain, this geyser was perfectly quiet, so 

 that it is not a constant geyser, as Professor Comstock supposed. 



No. 14 is a bubbling pool between the Clepsydra and the Gore Springs. 

 ISo. 15 is an unimportant hole which receives some of the overflow from 

 the Fountain. 



Gore Springs. — I have given this name to a group of springs near 

 the edge of the terrace, which are characterized by an abundant de- 

 posit of ferric oxide, which gives a gory appearance to the surround- 

 ings. There are altogether about a dozen springs and pools. To one 

 of them (e) Professor Comstock has given the name of Fitful Geyser, 

 although it spouts only a foot or two. It has intervals of quiet, the 

 duration of which was not determined. Several of the springs besides 

 are spurters, but none throw the water to a height of more than 2 feet. 



Ko. 16. This is a spouting spring on the line of a fissure in the mound 

 near the edge, just below the Gore Springs j a and b are on the same 

 fissure. 



This completes the springs that are on the Fountain terrace, or plateau. 

 At the foot of it, south of No. 13, is No. 29, a large cavern-like spring 

 with a pool. No. 30 is here also, and beyond this is a wide flat with 

 email springs and numerous steam vents. Following around the edge 

 of the terrace to the west and northward we find the remaining springs 

 of the group (Nos. 17-28). Several of these are very large, and a num, 

 ber are spouters of considerable size, and one or two are probably gey- 

 sers of considerable power, although they were not seen in action. 



Nos. 17 (Back spring), 17&, and No. 19 are three openings or bowls in 

 a large, somewhat irregular basin ; No. 17 is a boiling spring and 176 is 

 quiet; No. 19 receives overflow fi-om them. Outside of the bowls the 

 basin is shallow/. It was difficult to obtain the temperatures in these 

 bowls as they were some distance from the rim of the basin. 



No. 18 is a handsome, large pool or basin with two bowls, each about 

 20 feet in diameter, with beautiful blue-tinted water. The basin is 

 white- and marble-like with a yellow ornamented rim of fungoid-like 

 mosses. At one side there is a si)Outing hole, from which the water is 

 ^urted occasionally. This hole is about 6 inches in diameter. At 



