r 



On Underground Temperatures. Table IV. 



113 





V 



VI 



YII 



_ 



1 Number in 

 the general 

 list, Table I. 



Rise of 

 water rela- 

 tively to the 

 surface. 



Difference 

 between the 

 temperature 



at surface 

 and at depth. 



Rate of 

 increase of 

 depth for 

 1° Fahr. 



Notes and remarks. 



J 





Fahr. 



Feet. 





184 





Ill 



52 





151 



92 

 99 

 95 



88a 



+ 

 + 

 + 



9-5* 

 (3-7) 



10? 



4-6? 

 11 



33 



68 



42 

 51 

 36 



36 



* This result is assuming the 

 mean temperature to be 75 '2°, which is 

 that of Jabalpur, a neighbouring town 

 nearly on the same level. In the Brit. 

 Assoc. Rept. the rate of increase (68 ft.) 

 is calculated from the temperature at 

 the depth of 60 feet (81°) where the 

 water may be affected by convection 

 currents. 



f The surface temperature at the 

 African wells is very uncertain. 



«»6 





22 

 (4) 

 (16) 



50 

 75 

 44 





84 





35 



73 





88 



+ 170? 



(35) 

 27-8 



71 

 75 





121 



169 



212 

 112 



+ 



+ 104 



54 

 (52) 



8? 



56 

 74 

 88 



60 



X The observations at 3029 feet 

 were taken with great care, and were 

 considered reliable. The discrepancy 

 at the greater depth is at present un- 

 accountable, unless it were due to con- 

 vection currents. 



§ In this well an infiltration of water 

 from a higher level was suspected. 



223 



+ 









224 



+ 



7-1 



36 





VOL. XLI. 



I 



