Fig. I. — Station F-2, Showing the Foreground Soil Well, Thermom- 

 eter Pipes, and Evaporimeter, and in the Background, Tower on 

 Which Observations Were Made from 1910 to 1912. July 7, 1918. 



Fig. 2. — Station F-6. Looking across the Slope. 



Notethi tation in the foreground where it has not been disturbed. 



July 7. 1018. 



