62 



Extremes and means of .so/7 temperatures for 18S9, etc. — Continued. 



SOIL TEMPERATURES OBSERVED AT PENDLETON, OREG. 



Among the United States experiment stations for which soil tem- 

 peratures have been published, I quote the following observations 

 made by Mr. P. Zahner, voluntary observer at Pendleton, Oreg., (lat 

 45°.7 N.; long. 112°.2 W. ; altitude, 1,122 feet), because it represents 

 a climate so different from that found in the same latitude east of the 

 Rocky Mountains. A number of observations of diurnal periodicity 

 are given by Zahner, and a shorter series is at hand for Cor- 

 vallis, Oreg. (lat. 44°. 5 N. ; altitude, 150 feet). The comparison 

 between these shows that the Pendleton air and soil are appreciably 

 warmer than the Corvallis in July, August, and September, but colder 

 in November and probably also in December. In general the maxi- 

 mum soil temperature at Pendleton at all depths follows that of the 



