EXPERIMENT STATION BULLETINS. 



795 



TABLE 83— 1914-1915.— Conc/urfed. 



Table 83 contains the monthly, seasonal and yearly average tempera- 

 ture for the second year, December 1912 to November 1913. The data 

 show that the temperature of all the soils at the 5-inch depth either com- 

 pletely or almost reached the freezing point in December. During 

 January it remained at or slightly below the freezing point. In February, 

 however, it fell several degrees below this point and was lowest in the 

 soil to which was added no peat, slightly higher in the treated soils and 

 highest in peat. As a matter of fact throughout the winter months peat 

 remained the warmest followed by the soils with an increasing organic 

 matter content. The difference, however, was comparatively very small. 

 The temperature at the 18-inch depth of all the soils reached the freez- 

 ing point in February. 



In March all the soils at both depths had thawed except peat at the 

 IS-inch depth. By April, however, peat also had completely thawed. but 

 its temperature was about 7°F lower than that of the other soils at the 

 5-inch depth and about 5°F at the 18-inch depth. By May the tempera- 



