Earth Temperahcres at Kimhcrley. 



431 



TABLE 10. 

 Disturbance of Temperature consequent upon Eain. 



Day. 



One Inch 

 Min. 



One Inch 

 Max. 



One Foot. 



Two Feet. 



Four Feet. 



Six Feet. 













o 



o 







o 



1 



- 0-5 



- 21-9 



- 5-5 



- 1-3 



+ 0-1 



+ 0-3 



2 



-3-2 



- 16 



-5-2 



- 26 



0-0 



+ 0-2 



3 



- 3-2 



- 7-8 



- 3-3 



- 2-7 



-0-3 



+ 0-1 



4 



- 21 



- 8-8 



- 2-2 



- 2-3 



-0-4 



+ 0-1 



5 



- 1-4 



- 6-7 



- 1-7 



- 2-0 



- 0-5 



0-0 



6 



-0-6 



- 1-9 



+ 0-1 



- 1-4 



- 0-6 



0-0 



7 



+ 0-7 



+ 0-4 



+ 0-7 



- 0-8 



- 0-6 



- 0-1 



8 



+ 1-9 



- 3-9 







- 0-4 



- 0-5 



- 0-1 



In this Table the first day is the day of rain. It appears from this 

 that the minimum temperature of the surface is not much affected 

 while the rain lasts, but that the maximum runs down immediately 

 and rises gradually afterwards. The effect is felt at night for 

 48 hours at least. The disturbance appears almost immediately at 

 a depth of 1 foot, and it travels downward at a faiily uniform speed 

 of 10 inches a day. 



A consideration of the facts adduced in this paper prompts the 

 suggestion that the lagging of air temperature, whereby the hottest 

 and coldest times of the year are more or less later than the sol- 

 stices in various parts of the world, may depend as much upon 

 the quality and dampness of the ground as upon the vertical 

 circulation of air. 



The Table at the end gives the average temperatures, at each 

 depth observed, for trihemera throughout the year. For example, 

 the temperatures opposite January 3 are averages for January 1, 

 2, and 3. The sequence of values in this Table indicates a 

 downward tendency in the temperatures, e.g., at 4 and 6 feet the 

 average temperature at the end of December comes out much lower 

 than those of the beginniug of January. Another curious feature is 

 that the annual cold spell of the middle of July is felt in the ground 

 to a depth of 2 feet. 



