SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 66 



Fig. 6. — White Dome Geyser, near Great Fountain, in eruption with hot 

 waters cascading down its sides. This dome is in midst of broad plain, and 

 owes its prominence to gradual deposit of siliceous matter largely by evapora- 

 tion. Photograph by Walcott. 



Fig. 7. — Ruins of Grotto Geyser, with two centers of eruption. Upper Geyser 

 Basin. Photograph by Walcott. 



