37° Mining. 



A fa(ft no lefs important, and which he confirmed alfo, is, 

 that the application of Galvanilni increafes in a particular 

 manner the aftion of the parotid, the lachrymal, and max- 

 illary glands, that of the kidneys and of the whole lymphatic 

 fy "tern. To produce this aftion the apparatus mull be di- 

 reftedj not to tiie glandulous organs, but as much as poflible 

 to the origin of the nervous trunks which diftribute them- 

 felves thither. 



' II may be readily conceived what advantage (kilful anato- 

 mies may derive from an application of Galv^nifm lo the dif- 

 ferent fyllems of the animal economy, efpecially if to ana- 

 tomical knowledge they unite a thorough acquaintance with 

 the theory of rational medicine. Tourlet. 



LXVI. Intelligence and Mi/cellaneous Articles. 



^^ MINING. 



A HE mines of Cornwall and its neighbourhood now yield 

 fo laroe a pari of the metals fo valuaole to the arts, copper 

 and tm, of all that the world produces of thefe Aibftances, 

 that the prefent ftate, and probable future one of produftive- 

 nefs is hiohty interefting to thofe connected with the ufeful 

 manufa6lures. 



Tin, though the oldeft objeft of the miner's fearch in 

 Cornwall, now employs by far the lefler number of hands 

 and amount of capital ; the quantity raifed of courfe is much 

 diminiflied. Generally fpeaking, the tin mines have not been 

 found to hold their nchnefs to fo great a depth beneath the 

 furface as copper fecms" to do ; confequently many, which 

 were highly produdlive mines of this metal, now are flopped, 

 or are worked to little advantage. 



Polgoolh, the greatefl tin mine now in the world, though 

 it produces large~quantities of ore, yet it is attended with fo 

 great an expcnfc from its depth, that is underftood to pay 

 the adventurers now but very little profit, A report of cobalt 

 being found in this mine has been heard, but v.c do not 

 know whether it is entitled to credit; we wifli it may, but, 

 as far as we have had opportunities of judging of the mine- 

 rals produced in this dillrift, it does not appear to us pro- 

 bable that thefe fcarcer ones will be found in quantities fuffi- 

 cient to repay any great expenfe in fearching for them. The 

 tin mines in the vveOcrn part of the county, between Pen- 

 zance and the Land's End, are doing well for their proprie- 

 tors in general ; and though they have for a few years pro- 

 duced but little, they now are throwing up good quantities 



of ore. ^, 



The 



