64 



Prof. J. Prestwich. 



I 



II 



Ill 



IV 



Locality. 



Place of observation. 



Height of 

 surface 

 above 

 sea-level. 



Mean 

 annual 

 tempera- 

 ture of 

 surface. 



49&. Cornwall, North Eoskear. 



n 



J} ecu. 



Fahr. 



50° 







55 55 







j> 



55 5> 





" * 



55 



JJ 5J 



49£. „ East Pool .... 







55 









55 



5) 55 



49,/. „ Wheal Uny, 

 Eedruth. 







" ' '. 







»5 



55 55 



Eedruth. 





. * 



» 





• • 



55 



55 5) 

 Hkift * KjOL LI W djllj ILcLSb VV lied! 



Virgin Consolidated. 

 Mines, Eedruth. 







55 





• • 



JJ 



49?m. Cornwall, Wheal Towan, 

 St. Agnes. 













55 



55 55 



49w. „ Wheal Prudence 







>» 



^«5JjC/. ), VV llcdl V Ul . • . 



Coppef and tin wine . . . 



• • 



5> 

 51 



5 5 55 



SO. Cornwall, Binner Downs . 



55 55 





SO 











• • 



5> 







• • 



5) 









55 



51. Devonshire, \Y heal Friend- 

 ship. 







» 







H 







• • 



5> 







• • 



55 



52. Cornwall, St. Ives Consols 



n . " . i 1' " '• 

 L/Opp6T CLYld tin win 6 . . . 



• • 



55 





55 • • • 





» 





55 ... 



• • 



5J 



53. Cornwall, Wheal Wreath. 



5> • * • 





55 







55 









55 









55 

 55 





Vcivious tin and copjpef 

 mines 





50 





5) 55 * • 





55 

 55 



55. Monte Massi, Tuscany*.. 



55 55 * * 



Shaft (?) ..." 



174 



55 

 55 



56 ? 





jj » )f ■•• 









* No water. Shaft well ventilated. An abnormal centre 



of heat in this district. 



