changing that at no two moments during that time are the forms or 
I 
movements the same. The eruptions are repeated at irregular in- 
tervals of a few hours and are not known to vary essentially from 
the manner of action here described; yet I have good reason to 
believe that at certain times there is a much greater exhibition 
of power. It must be borne in mind that all the elevations, such 
< 
as the tubes, rims, and mounds about the crater of a geyser, are 
built by the evaporation of the water, and the portion of surface 
covered by the beaded silica indicates precisely the area over 
which the erupted water falls. In no case did I observe the water 
, fall outside of a circle of 60 feet in diameter, and the additional 
force necessary to scatter It over twice that amount of surface 
must produce a display truly magnificent. That this display 
actually occurs is attested by one of our mountaineers and almost 
demonstrated by the extent of the beaded surface. ^hiring the 
earlier part of the eruption a considerable quantity of water flows 
over the rim and down the sides, where it has formed a series of 
t\J\ & C~ A- 
basins somewhat similar in form and color to those at the springs 
on Gardiner's River. Railing from one to another of these it 
passes off down the slope and joins a large stream of hot water which 
issups from a steady spring not far away. 
A few hundred yards farther up the ravine, and on the opposit 
side of the creek, I discovered a small spring that deserves in a 
q^iet way to be one of the great attractions of this attractive 
region* It is isolated from the neighboring springs and nestled 
4 I 
in against an abrupt Dank, so obscured by tall pines that the visitor 
