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ROYAL SOCIETY OF CANADA 



mometer. Eain melting the snow on Nov. 26th, and on Dec. 22nd, 

 produced a similai'ly rapid lowering of the soil temperature, but none 

 that was quite so remarkable as that of Dec. 14th last year. 



Daily Eange op the Four Inch Thermometer. 



We have not been able as yet to take any further observations of the 

 diurnal curves of the upper thermometers, but we hope soon to be able to 

 make the records automatic, which Avill remove the difficulty. We have 

 however tabulated the daily range of the 4 inch thermometer for a 

 number of days in May, June and July of last year for comparison with 

 the hours of sunshine, the rainfall and the range of the air temperature. 

 These observations illustrate in a remarkable manner the close depen- 

 dence of the 4 inch thermometer on the sunshine. The effect of a dull 

 rainy day is often to reverse the direction of the change, that of the air 

 remaining the same as usual. The absence of sunshine appears however 

 to have more elfect than the quantity of the rainfall. 



Eange of 4" Thermometer Compared with Sunshine, Eainfall, 

 AND Air-temperature Eange. 



