I'EALE.] 



UPPER GEYSEE BASIN — GIANT GROUP. 



199 



are seen on the north side also, but here instead of receiving the over- 

 flow they hold the water that falls during the eruptions. The erup- 

 tions are very fine, and resemble in some respects those of the Giantess, 

 although the duration is only a few minutes. The whole mass of water 

 in the basin appears to be tossed into the air in an immense splashing 

 mass, with an immense escape of steam, through which occasional jets 

 are projected, to a height of 30 or 40 feet. Several eruptions were seen 

 from a distance while we were in the Upper Basin, from August 27 to 

 September 1, but they were not identified at the time and no obser- 

 vations were made. On our second visit the following were noted : 



IsTo. 1. — Eruption began at 5 p. m., September 10; duration, 6 minutes. 



No. 2. — Eruption began at 1.15 p. m., September 11. 



The notes are of course too few to determine anj^thing in regard to 

 the periods of the geyser, but the interval is probably not of very great 

 length, as clouds of steam were seen rising from the position of this 

 geyser almost every day of our first visit to the Basin. As I have 

 already indicated, I think it probable that the supposed eruption of the 

 Giant, seen by the Earl of Dunraven, was of this geyser instead. It is 

 not strange that it escaped notice in previous years, as the Basin is so 

 large that one is working in the upper part he necessarily misses seeing 

 the geysers in the lower part. Our stay in 1871 and 1872 was limited 

 also, as was that of Doane in 1870 and Comstock in 1873. 



BOUND SPRING GROUP. 



This name, for convenience, has been given to a small cluster of springs 

 that are situated between the White Pyramid Group and the river, 

 opposite the lower or northern cluster of the Grand Group. The name is 

 given because the prevalent form is circular, seven out of the nine 

 springs having large^ flat, circular basins. But two of the springs have 

 high temperatures, one of which (No. 7) is a small spouter and the other 

 (No. 9) a vigorous boiling spring. Three temperatures taken in this 

 group in 1871 are, 148° F., 154° F.,and 156° F., which is about the same 

 as shown in the table. There are probably no true geysers in the group, 

 as the deposits surrounding the springs do not indicate the falling of the 

 water from any great height. The springs are all suflaciently described 

 in the following table: 



Table of the Round Spring Group. 



Number or name. 



Size of spring. 



to 



2 



g 



IS 



P< 



s 



Remarks. 



1 



26 by 31 feet 



146 



150 



164 



159 



146 



a 164 



b 146 



180 



144 



196 



Rod and green lined pool. The water does 

 not fill the basin. 



2 



Basin is 38 by 46 feet. Spring 

 in center is 15 by 16 feet. 



18 feet diameter, orifice 3 

 feet diameter. 



37J by 10 feet and 21 feet 



3. Round Spring 



4. Pear Spring 



5 



Yellow-lined flat basin ; with funnel-shaped 

 orifice. 



Double white-lined basin ; water has green- 

 ish-white tint. 



Outside basin is gray ; inner one is green- 

 ish-yellow. 



j Two basins with small orifices. 



Spouting spring. 



Basin not full. The spring has a small fis- 

 sure in the center. 

 Clear boiling spring in a white basin. 



6 







b 2 feet diameter 



7 



Basin is 8 feet diameter 

 spring 3 feet diameter. 



Basin 19 foot diameter; 

 spring is 7 by 7i feet. 



3J bv 6 foet 



8 



9 







