GEYSERS. 105 



every kind, viz. : hot springs, carbonated springs, fumaroles, mud- vol- 

 canoes, and geysers. In the Yellowstone Park itself there are at least 

 3,000 vents of all kinds, and of these more than sixty are eruptive gey- 

 sers. In some places, as on Gardiner's Kiver, the hot springs are most- 

 ly lime-depositing (page 77) ; in others, as on Firehole Kiver, they are 

 geysers depositing silica. 



Bee-Hive Geyser (from a Drawing by He 



In the upper geyser basin the valley is covered with a snowy de- 

 posit from the hot geyser-waters. The surface of the mound-like, 

 chimney-like, and hive-like elevations (Fig. 90), immediately surround- 

 ing the vents, is, in some cases, ornamented in the most exquisite 



