SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 66 



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Fig. io. Great Fountain Geyser in eruption with arrows of water shooting 150 

 feet above mouth shown in Fig. 9. Photograph by Walcott. 



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Fig. II. Looking down into throat of small geyser near Firehole River in 

 Upper Geyser Basin. A type of siliceous deposit relatively rare. Photograph 

 by Walcott. 



