800 STATE BOARD OP AGRICULTURE. 



The chief and most important facts revealed by the ])receding tables 

 may be summarized as follows: (1) The magnitude of the fluctuation 

 was very small in winter in all soils and at all depths. After the soils 

 (hawed, however, it began to increase until it reached a maximum in June 

 and July and then commenced to decrease again until Avinter. (2) 

 At the 18-inch depth the degree of amplitude was very small throughout 

 the year in all soils but especially in peat. At the 3, 5 and G-inch 

 depths, however, it was very high and about the same during the sum- 

 mer months in all the soils having various percentages of organic matter, 

 but quite lower in [)eat. (3) The minimum temperature attained was 

 highest in peat, slightly less and about the same in the various soils 

 treated with peat, and lowest in the untreated sand. While the maxi- 

 mum was greatest and practically equal in the treated soils, slightly 

 smaller in the untreated sand, and still smaller in peat, the variations, 

 both for the minimum and maximum Avere not very large. (4) The 

 amplitude of the air temperature was considerably higher than that of 

 all soils at any depth. 



