CHARACTERISTICS OF SOILS 



13 



The average air temperatures for Nebraska, Tubingen 

 (Germany) , and Geneva (Switzerland) are lower than sur- 

 face and near surface temperatures. The Michigan air 

 temperatures were recorded by an instrument not shaded 

 from the direct rays of the sun. 



TABLE IV 



1. Temperature averages for 12 years at the Nebraska station 



2. Temperature averages for 5 years, Pennsylvania station (Frear) 



3. Temperature averages for 4 years, Munich, Germany 

 (Ebermeyer) 



4. Midday temperature averages on fine days for two seasons, 

 Tubingen, Germany (Schiibler) 



