On Under ground Temperatures, Table 1. 



57 



UNDERGROUND TEMPERATURES. 



discordance in those observations, which are repeated more than once, 

 to corrections of the mean temperatures of the place, 

 with the exception that the mean annual surface temperatures are cor- 

 indebted to Mr. R. H. Scott, F.R.S., of the Meteorological Office, for 

 the lists of the Scottish Meteorological Society (marked s), and to the 

 are those given by the original observers or by Dove. Corrections 

 temperature of the place has not been recorded, that of the nearest 

 in height, &c. (ante p. 7). (a) in Column YII refers to notes in 



seated spring, which rises by that means over or near to the sur- 

 either in search of minerals or of water, and with or without water, 

 temperature at surface or at small depths. 



10 



Depths 

 below 

 surface. 



Feet. 



332 



675 

 1010 

 1420 



721 



1712 

 164 



358 

 1500 ? 

 722 



870 

 984 

 328 

 590 

 870 

 870 



656 

 804 

 936 

 1082 



VI 



Tempera- 

 ture at 

 depths. 



VII 



Eefeeences and Kemaee:s. 



Grensanne, 1740 ; Arago, " Notices Scientifiques," 

 vol. hi, p. 317 (1856). Temp, of Mulhouse, 51°. 



Saussure, 1796 ; Arago, op. cit. 



Humboldt, quoted by Arago, op. cit., p. 338. 



Daubuisson. The original observations were pub- 

 lished in the "Journal des Mines," vol. xiii, 

 p. 113 (1803). The observations recorded here 

 are given by him in his " Traite" de Greognosie," 

 1819, p. 444, as the most reliable. 



Temp, of Dresden, 47° F. 



f Temperature of spring issuing from lode. The air of the working galleries 

 was 92° Fahr. 



