AGRICULTURAL EXPERIMENT STATION. 



147 



In order that comparisons may be made between soil tempera- 

 tures at different depths and the air temperatures during the same 

 months and in the same locality, the following tables are added. 



Thermometer in the Open Air. 

 (Locality the same as that of the soil thermometers.) 



7 A. M. 



1889. 



1 P. M. 



7 P. M. 



Mean. 



May, 



52.95 



68.30 



59.47 



60.24 



June, 



63.36 



74.27 



68.07 



68.57 



July, 



65.12 



75.75 



70.86 



70.58 



August, 



59.97 



74.20 



66.81 



66.99 



September, 



54.39 



70.86 



61.55 



62.27 



October, 



37.41 



52.80 



44.05 



44.75 



Mean, 



55.53 



7 a. m. 



69.36 



1890. 



1 P.M. 



61.80 



7 p.m. 



62.23 



Mean. 



April, 



35.76 



49.02 



42.55 



42.44 



May, 



49.16 



60.60 



53.58 



54.45 



June, 



57.95 



67.64 



62.76 



62.78 



July, 



67.10 



76.19 



71.85- 



71.71 



August. 



61.50 



73.78 



6S.84 



68.04 



September, 



52.04 



66.16 



58.52 



58.91 



October, 



37.70 



53.19 



45.63 



45.51 



Mean, 



51.60 



63.80 



57.68 



57.69 



Tables Showing Changes of Temperature in the Soil for 



Increased Depths. 



1889. 



Depth of 

 Thermometer. 



Mean tempera- 

 ture for six 

 months, May to 

 Oct. inclusive. 



Difference in 

 mean tempera- 

 ture. 



Changes in tem- 

 perature for one 

 inch. 





o 

 60.50 

 60.77 

 59.63 

 58.78 

 58.26 

 56.40 

 54.79 



o 



+0.27 

 —1.14 

 —0.85 

 —0.52 

 —1.86 

 —1.61 



o 





+0.13 





—0.38 





—0.28 





—0.17 





—0.15 





—0.13 







