EXPERIMENT STATION BULLETINS. 



639 



ate percentages of organic matter; the temperature of these latter 

 soils was also almost the same. 



From table 71 it is seen that the highest seasonal amplitude occurred 

 in summer, then in autumn, spring and winter. The greatest variation 

 in the amplitude of the different soils was shown in the spring and the 

 least in winter. Throughout all the seasons the soil with 3.32% or- 

 ganic matter exhibited the largest amplitude with the soils containing 

 2.01, 5.47, G.95, and 1.81% and peat followed in order. This order 

 maintained itself also for the j^ear. 



COMPARISON BETWEEN MONTHLY AVERAGE AND RANGE OP TEMPERATURE OF 



THE AIR AND THE SOILS. 



TABLE 72.— COMPARISON BETWEEN THE MONTHLY A\'ERAGE TEMPERATURES OF THE AIR AND 

 OF THE SOIL WITH DIFFERENT AMOUNTS OF ORGANIC MATTER. 



