rEALE] LOWER GEYSEE BASIN RIVER GROUP. * 171 



at all suitable for bathing-, having a temperature of 200° F. A short 

 distance below this is another handsome spring — 



No. 89. Cavern Spring. — This also was named in 1871, and is a beau- 

 tiful, quiet, blue spring, with extremely transparent water. It is on the 

 edge of the river, from whieli it is separated by a narrow rim. This 

 part is the narrowest portion of the basin, being only 8 feet wide, and from 

 this edge the bottom of the basin slopes away from the river into a deeper 

 pool, 20 feet in width, at the back of which is an overhanging edge. The 

 temperature of the water is 162°, which is only 1° more than that observed 

 in 1871, showing that the spring has not changed since then Back of 

 ISTos. 88 and 89 is a large cluster of springs (Kos. 90, 91) which are com- 

 paratively unimportant and extend some distance north at a little dis- 

 tance from the river. 



The next cluster is somewhat isolated from those already described, 

 and is located opposite the island at the bend of the river. 



The Grotto is a mud spring 6 feet in diameter, at the base of the hill, 

 with a temperature of 180° F. There is also a white mud pot near these 

 springs (102-104), which are mainly quiet springs, with a considerable 

 deposit of iron. There are a number of springs and pools in the grass 

 that were not given in the table. 



Xo. 105 is east of the cluster just referred to, and is an isolated circu- 

 lar spring 15 feet in diameter, with greenish water. 



All the springs hitherto described in this group are on the east side 

 of the Fire Hole. Those remaining are on the opposite side, and begin- 

 ning at the north we have first the Crown Spring, which is a circular, 

 white basin 4 feet in diameter, with a rim 4 inches high. It is somewhat 

 crown-shaped, on a mound, and has a temperature of 169° F. 



Nos. 107 and 108 are two springs south of the Crown Spring, and are 

 snrrounded by other springs and vents. Near them, also, are several 

 lake-like ponds. 



Proceeding southward we soon reached the mound opposite the falls, 

 or rapids, of the river. 



No. 109 is a geyser-like spring, with globular, yellow masses lining it. 

 The water outlets are also yellow lined, and there are many fissures in 

 the mound around it. The temperature is 199° F. This is probably a 

 geyser. 



Mound Geyser. — Although never seen in action, this is probably a 

 geyser. It has a basin 25 feet long and 10 feet wide, in which at 

 the time of our examination the water was 3 feet below the top. It is 

 lined with handsomely-ornamented yellow globular masses of geyserite. 

 It was seen bulging several times, but no active spouting was observed. 

 The temperature of the water was 199° F. This is the same as in No. 109, 

 and the ornamentation of the basin is also similar. South of these, which 

 are the two important springs of this cluster, are a number of cones sim- 

 ilar to those on the opposite side of the river. They are sufficiently 

 described in the table. On an island opposite them, near the eastern 

 bank, are the Island Cones, which were not closely examined. South of 

 the cones are a number of springs not examined. The next cluster (113- 

 118) is on a flat opposite the Fortress. There ar no important springs 

 here. Still farther south is a cluster (119-123), most of which are in hard 

 deposit. Crossing the river, now we find the last cluster above (south 

 of) Fountain Creek, at the foot of a marshy area near the river. They are 

 I24-12G, and are, with the exception of No. 125, small, rather obscure 

 holes. 



In 1871 only 95 temperatures were taken In tliis group, the highest 



