414 Action of the Atmosphere upon newly-deepened Soil. 



N.B. — The degrees are of Fahrenheit's scale. 



One evening in January, 1856, 1 made some observations of this 

 sort in an open plot of ground in my garden. The following 

 memorandum shows the comparative heights, at the same time, of 

 two thermometers, one hung in a stand in the open air at 4t feet 

 from the ground, the other placed directly on the surface of the 

 snow : — 



Times of Observation. 



At 4 hours 15 minutes p.m. 

 At 20 minutes past 4 p.m. 

 At half past 4 p.M 



Thermometer 

 in the Air. 



32-1 F. 



31-9 



31-3 



Thermometer 



on the Snow. 



18-8 

 18-5 

 18-2 



Difference. 



13-3 

 13-4 

 13-1 



Showing a difference in one case of nearly 13t^ Fahr, .The 

 thermometers used were superior instruments made by Negretti 

 and Zambra, of London, and had been compared with standards 



