OUR GREATEST NATIONAL MONUMENT 



■./"^ 



Photograph by R. F. Griggs 

 APPROACHING ONE OF THE BIG FUMAROEES 





Photograph by F. G. Zies 



STEAM RISING FROM HOT SPRINGS IN THE LOWER END OF THE VAELEY 



These streams were running cold in 1917 and 1918. At that time the hot springs of 1919 were 

 fumaroles, whose steam escaped into the air without warming the surface waters. 



