AGRICULTURAL EXPERIMENT STATION. 



163 



Tables Showing Changes of Temperature in the Soil for 

 Increased Depths. 



1889. 



Depth of 

 Thermometer, 



Mean tempera- 

 ture for G inns., 

 May to Oct. 

 inclusive. 



Difference in 

 mean tem- 

 peratures. 



Changes in tem- 

 perature for 

 one iucl). 



1 inch . . . 

 3 inches. 

 G inches. 

 9 inches. 

 12 inches 

 24 inches 

 86 inches 



GO. 50 

 60.77 

 59.63 

 5S-78 

 58.26 

 56.40 

 54.79 



+0.27 

 — 1 14 

 —0.85 

 —0.52 

 —1.86 

 —1.61 



+0-13 

 —0 38 

 — 0.28 

 — 17 

 —0.15 

 —0.13 



1890. 



Depth of 

 Thermometer. 



Mean tempera- 

 ture for 7 mos., 

 April to Oct. 

 inclusive. 



Difference in 

 mean tem- 

 peratures. 



Changes in tem- 

 perature for 

 one inch. 



1 inch . . . 

 3 inches. 

 6 inches. 

 9 inches. 

 12 incnes 

 24 inches 

 36 inches 



54.63 

 54.92 

 53.96 

 53.26 

 53.31 

 51.96 

 50.77 



+0.29 

 —0.96 

 —0.70 

 +0.05 

 —1.35 

 —1.19 



+0.14 

 —0.32 

 —0.23 

 +0.02 

 — 11 

 —0.10 



1891. 



Depth of 

 Thermometer. 



Mean tempera- 



turefor 7 mos., 



April to Oct. 



inclusive. 



Difference in 



Changes in tem- 



mean tem- 



perature for 



peratures. 



one inch. 











+0.24 



+ 0.12 



-1.33 



—0.44 



—0.82 



—0.27 



—0.22 



—0.07 



—2.03 



—0.17 



—1.13 



—0.09 



1 inch . . . 

 3 inches. 

 6 inches. 

 9 inches. 

 12 inches 

 24 inches 

 36 inches 



56.65 

 56.89 

 55.56 

 54.74 

 54.52 

 52.49 

 51.36 



An examination of the tables shows that the soil responds 

 readily to the daily heat of the sun to the depth of three inches, 

 less readily to the depth of six inches, in a moderate degree only 

 to the depth of nine inches, and very slightly below twelve inches. 

 To the depth of three inches the range between the morning and 



