On the Conduction of Galvanic Electricity thr< 





361 



Mineral adjoining Mineral resting on that Mineral resting on that Mineral resting on ]~^ 

 until ot lode, in first column. in second column. tlmtintliirdcolumn. 



Containing rock — Clay-slate. 



Quartz 

 Quartz 

 Quartz 

 Quartz 



Quartz 



Quartz 

 Quartz 

 Quartz 

 Quartz 

 Quartz 

 Quartz 

 Quartz 

 Quartz 

 Quartz 

 Quartz 

 Quartz 

 Quartz 

 Quartz 

 Quartz 

 Quartz 



Quartz .... 



Quartz 



Quartz 



Quartz 



Chlorite 

 Quartz .... 

 Quartz . . . 



Fluor 



Iron pyrites 

 Iron pyrites 

 Iron pyrites 

 Iron pyrites 

 Iron pyrites 



Quartz 



Copper pyrites 



Sulphate of barytes. , 



Copper pyrites 



t Sulphuret ofanti- \ 



\ mony J 



Oxide of titanium. . . 



Blende 



Celestine 



Galena 



Quartz 



Quartz 



Copper pyrites . 



Carbonate of iron . . 

 Phosphate of iron 

 Sulphuret of silver 



Spathose iron ore 



Earthy brown iron ore.Red oxide of copper. 



Earthy brown iron ore 

 Earthy brown iron ore 

 Earthy brown iron ore 

 Hematite iron ore. . . . 

 Wood tin 



Quartz I Oxide of tin 



Quartz jNative silver 



Quartz j Sulphuret of silver . . 



Quartz 'Red silver ore 



Quartz j Native copper 



Quartz Vitreous copper ore. . 



Vitreous copper ore. . 



Buntkupfererz 



Copper pyrites 



Copper pyrites 



Tennantite 



Copper pyrites 



Red oxide of copper 

 Galena 



Carbonate of lead 

 Phosphate of lead . 

 Sulphate of lead . . . 

 Oxide of manganese. 



Quartz . 



Quartz . 

 Quartz . 

 Quartz . 

 Quartz . 

 Quartz . 

 Quartz . 

 Quartz . 

 Quartz . 

 Quartz . 

 Quartz 

 Quartz . 

 Quartz 

 Quartz 

 Chlorite 

 Pearl-spar 



Vitreous copper ore. . 

 t Capillary red ox- \ 

 \ ide of copper . . i 



Sulphuret of bismuth 



Blende 



Blende 



Galena 



Blende 



Mineral pitch . . . 

 Carbonate of lime. 



Oxide of tin 



Copper pyrites . . . 



Fluor Copper pyrites 



Fluor 



Galena 



Pearl-spar 



Fluor 



Blue lead ore 

 Blende 



Quartz 



Wheal Friendship. 

 East Crinnis. 

 United Mines. 

 United Hills. 



Pcngelly. 



Virtuous Lady. 

 Polberrow. 

 Binner Downs. 

 Wheal Penrose. 

 West Pink. 

 Numerous. 

 Virtuous Lady. 

 Wheal Falmouth. 

 Dolwath. 

 Wheal Charlotte. 

 Pentire-glaze. 

 Wheal Alfred. 

 Mellanear. 

 Restormel. 

 Polberrow. 

 Numerous. 

 Herland. 

 Wheal Brothers. 

 Dolcoath. 

 Numerous. 

 Wheal Speed. 



Providence. 



Wheal Falmouth. 

 Numerous. 

 Fowey Consols. 

 Fowey Consols. 

 Polberrow. 

 Numerous. 

 Wheal Rose. 

 Union Mines. 

 West Pink. 

 Wheal Hope. 

 Union Mines. 

 South Towan. 

 Binner Downs. 

 Numerous. 

 Cann Quarry. 

 Wheal Unity Wood. 



As the foregoing table is a first attempt at arranging these 

 facts, it will doubtless be found susceptible of many improve- 

 ments. 



For the present I abstain from mentioning inferences, 

 though many are obvious enough. 



I remain, my dear Sir, 



Your most faithful, humble Servant, 

 Gongo Soco, Brazil, June 29, 1846. W. J. HeN'WOOD. 



LVI. On the probable Conduction of Galvanic Electricity 



through Moist Air. By Charles G. Page, M.D., Prof. 



Chem. and Pharm., Columbian College, Washington, D.C.* 



^EVEN or eight years since I observed a curious fact, which 



^ led me to the conclusion that many substances considered 



* From Silliman's Journal, September 1846. 



