56 



Prof. J. Prestwich. 



I. GENERAL TABLE OF 



In this Table the observations are placed in order of date. The 

 is generally due to the use of improved methods and instruments, or 



All the observations are tabulated in the terms of the original papers, 

 rected in accordance with later and better determinations. I am 

 some of these corrected temperatures (marked m) , and for others to 

 "Notices Scientifiques " of Arago (marked a). In other cases they 

 and additions have also been made for the surface heights. Where the 

 place of observation is given, allowance being made for difference 

 the other columns having reference to the same observations. 



By an Artesian Well is meant a drill-hole carried down to a deep- 

 face. By bore-hole is meant a boring of the like description, made 



A few ordinary wells are introduced merely as guides to the mean 



Locality. 



II 



Place of observation. 



Ill 



Height of 

 surface 

 above 

 sea-level. 



IV 



Mean 

 annual 

 tempera- 

 ture of 

 surface. 



1. Griromagny, near Belfort. 



2. Bex, Switzerland 



3. Gruanaxuato, Mexico. 



4. Cabrera „ 



5. Tebuilotepec „ 



6. Micuipampa, Peru. . . 

 *J. Freiberg, Saxony. . . . 



8. 



0. 

 10. 



Copper and lead mine. 



Salt mine* . 

 Silver mine. 



JBescTiertgliicTc lead and 

 silver mine 



Himmelfahrt ,, 



55 55 

 55 55 



Kuh-schacht „ 

 Junghohe-BirJce „ 



Feet. 

 1535 



$510 

 3776 

 11614 

 1378 



577 



55 

 5) 



656 

 1050 



Fahr. 



47 s ? 



45? 

 61 ? 

 60 ? 

 63 ? 

 46 ? 

 43 ? 



46 ? 



55 



45 ? 

 44? 



* The mine had been disused for three months. 



