166 REPORT UNITED STATES GEOLOGICAL SURVEY. 



triangular pool, lined with a vivid green deposit. It is at the base of 

 the hill, and down the latter the water trickles into the spring over a 

 red and green surface, the green being due to moss. The outlet of the 

 spring has a white border in the grass. The temperature is only 157° F. 



No. 32 is a small gray-lined spring, without an outlet, and having a 

 temperature of 176o F. 



No. 33 {Blade Spring) is still farther up the creek on the west side, and 

 is a clear spring, gushing from the side of the hill, 30 feet above the 

 creek level. It is surrounded by a bare spot, covered with a black de- 

 posit, which spreads out over a large area on the sloi)e below. It has a 

 temperature of 162° F. 



No. 34 is a clear spring on the east bank of the creek, above the Black 

 Spring, at the falls. It has a temperature of 184° F. There are some 

 dead pools in the grass above it, and also on the hill opposite are several. 

 A small cone is noticeable. This spring is the last one noted in the 

 ravine, although there are others above that are small and unimportant. 



No. 35 is a large round spring, hidden in the timber east of the White 

 Dome. It is about 40 feet in diameter and lined with brown leathery 

 substance. Its temperature is 153° at the edge of the i)ool. 



I have tried to compare the temperatures of 1871 with those of this 

 year, 1878, and the result is given in the table below, which, however, is 

 far from being comj)lete. No temperatures were taken here in 1872 : 



Comparison of temperatures taken in the White Dome Ch'oup in 1H71 and in 1878. 



Number and name. 



1871. 



1878. 



No. 1 



°F. 



162-193 



197 



190 



166-194 



184-187 



180 



180 



OF. 

 128-199J! 



Great Fountain 



199 



Beauty Spring 



194 



Cluster 5-18 



168-199 



Cluster 19-23 



No. 30 



103-199 



189 



No. 34 



184 







About 42 temperatures were taken in 1871, but the above are all that 

 I can j)ositively identify as being the same springs. 



SIXTH OR RIVER GROUP. 



Although this group is perhaps the largest in the LowerGeyser Basin, 

 it is the least important as far as geysers are concerned. It includes all 

 the springs on both sides of the Fire Hole Eiver from the mouth of 

 Fairy Fall Creek to the mouth of Fountain Creek. The table contains 

 147 temperatures, and these are by no means all that could have been 

 obtained had time permitted. They are scattered over an area of about 

 1,300 yards by 500 or 600. In all "the springs there is not one known 

 geyser of any power, although there are many spitting or spouting 

 springs which project the water to the height of a few feet. There are 

 a number of the springs with small cone-like craters, and many large, 

 handsome pools, with transparent water of beautiful blue and green 

 tints. The springs present an infinite variety in structure; some are 

 periodically agitated, others are constant boilers, and still others quiet 

 pools, with gelatinous and leathery deposits. The ornamentation of 

 their rims is varied and in most cases extremely handsome, as will be 



