(oe) 
nN 
MITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 66 
Fic. 10. Great Fountain Geyser in eruption with arrows of water shooting 150 
feet above mouth shown in Fig. 9. Photograph by Walcott. 
Fic. 11. Looking down into throat of small geyser near Firehole River in 
Upper Geyser Basin. A type of siliceous deposit relatively rare. Photograph 
by Walcott. 
