EXPERIMENT STATION BULLETINS. 



785 



the soil temperature increases with the depth, while during thi. day the 

 reverse is true. 



SEASONAL AND YEARLY AVERAGE TEMPERATURE, 



From the theoretical as well as from the practical standpoint it is 

 very interesting and important to know what is the seasonal and yearly 

 average temperature. These data of the different types of soil at the 

 various depths for the three years are presented in Tables 77, 78 and 79 

 inclusive. 



TABLE 77.— MONTHT.Y, SEASONAL AND YEARLY AVERAGE TEMPERATURE OF DIFFERENT TYPES OF 



SOIL, NOT C0\^RED WITH SAND. 



99 



