SMITHSONIAN MISCELLANEOUS COLLECTIONS 



VOL. 66 



First: To determine, if possible, the extent to which the lower 

 forms of alg"?e and possibly bacteria contributed, throue:h their activi- 

 ties, to the deposition from the geyser and hot-spring waters of the 

 contained carbonate of lime and silica. 



Fig. I. — Riverside Geyser in eruption. Upper Geyser Basi^. Water 

 falls into Fireliole River. Photograph by Mary Vaux Walcott. 



Second: The securing for the National Museum, of a series of 

 geyser and hot-spring deposits, also silicified wood from the petrified 

 forests and certain types of volcanic rocks. 



