86 



Prof. J. Prestwich. 



Locality. 



215. Mons, La Louviere Colliery 



216. Mons, Cuesmes Colliery 



211. North Seaton, Newcastle! 



218. Ashton Moss Colliery, 

 Manchester 



220. Dolcoath, Cornwall 



221. 

 223. 

 224. 

 226. 

 221, 

 228. 

 229. 

 230. 

 231. 



Passy, X Paris , 



La Fayette, Indiana 



Buenos Ayres 



Croft, Whitehaven § 



Lye Cross, Dudley [| . 

 Denton, 1 ^ Manchester 

 Richmond,** Surrey . 



II 



Place of observation. 



Coal pit 



another pit 



Tin mine 



Artesian well , 



Coal pit .... 



Artesian well . 



Ill 



Height of 

 surface 

 above 



sea-level. 



IY 



Mean 

 annual 

 tempera- 

 ture of 

 surface. 



Feet. 



±ahr. 



410 



50-5° 



» 



h 



351 



}j 







213 





>> 



n 







» 



j) 



197 





— 40 



47 5 





48 



280 

 • • 



50 





. . 



158 



SI 





.* 



62-7 



72 



48-5 



822 



47 S 





48 





49-6 



* In another trial made 300 metres from the shaft, the temperature at the same 

 depth was found to be 7075° F. 



f These observations were made by Professor Lebour at a point under the sea, 

 half a mile beyond water-mark, and 660 feet below O.D. 



J Diameter of well at top, 4 feet. 



The observations recorded in the preceding list (Table I) are 

 grouped in the following Tables II, III, IV, according to class, geo- 

 logical structure, and geographical position : — 



