G2 



Prof. J. Prestwich. 



Locality. 



31. Paris, Grenelle Well 



38. Cornwall, Levant 



39. „ Tresavean . . . . 



40. „ Consolidated . . 



41. Rudersdorf, Berlin 



42. St. Sever, Eouen. . 



43. St. Andre (Eure) , 



jj . " ' 



44. Yakoutsk, Siberia, 



45. Scotland, Carse of Falkirk. 



>> JJ 



„ Midlothian. . . . 



46. Cosseigne-les-Luxeinbourg 



41. Cornwall 



48. 



48a. 



49. 

 49 a. 



496. 



49c. 



49d. 



49e. 



49/. 

 49,?. 



Troyes, Aube . . 



St. Ouen, Paris. 

 Alfort, Marne . . 



Cornwall, East Wheal 



Grotty* 

 Cornwall, Consolidated . . 



,, United Mines. . 



" Great Wheal 

 Fortune. 

 Cornwall, Marazion .... 

 5> jj .... 



„ Wheal Trenwith 



JJ JJ 



,, South Roskear 

 Cambourne. 



II 



Place of observation. 



Artesian well 



Copper and tin mine 

 Copper mine 



Artesian 



Artesian boring 

 Artesian well . . 



Well 



Artesian well 



Artesian boring 



Various tin and copper 

 mines 



Artesian well 



Copper mine 



JJ 5) 



III 



Height of 

 surface 

 above 

 sea-level. 



Copper and tin mine. 



J > 5 J 



Copper mine 



j ? jj 



Feet. 

 213 

 80 

 362 

 318 

 153 



128 



525 



359 

 ? 



318 



* Nos. 49a to 49p are from Mr. Henwood's paper, " Trans. Roy. 

 Cornwall," vol. v, pp. 389 — 402. 



Arago gives a depth of 377 feet with a temp, of 31° F. 



Geol. Soc. 



