320 FUKESTKY INVESTIGATIONS U S. DEPARTMENT OK AGKICULTUKE. 



Soil temperatures Continued. 



Fi. 4.~>. Difference of soil temperature ( W O), all stations German observations. 



FIG. 46. Differences of Boil temperature (woods and open fields). Comparison of ele- 

 vations above sea level ( IF O). 



FIG. 47. Differences of temperature for young trees, Liutzel Station, woods and open fields (W O). 



