Mr. J. Taylor's Lectures on MeiaUurg^. 37 1 



tery great ; yet it is common in many of our lead ores, and k 

 extracted in Cornwall, Northumberland and Devonshire. ^ 

 often exists however in a proportion that does not pay for 

 separatmg it from the lead. The true silver ores are not 

 common with us, however they have been found in some in- 

 stances which are confined to Cornwall. The Herland mine, 

 which was some time since worked and is now again about to 

 be opened, yielded some quantity ; and in the eastern part of 

 the county some regular silver veins are now working that 

 produce ores similar to those of Peru or Mexico. 



Gold has been found in small quantities in Ireland, Corn- 

 wall, Scotland, and Devonshire; and arsenic, antimony, co- 

 balt, and some other inferior metals, are found in the mines of 

 Cornwall. 



The other countries in the old world which deserve notice 

 for the metals they afford, are — Germany, particularly SaXony 

 and the Hartz Mountains, which have for many ages been the 

 seat of mining, and have produced silver, lead, and a variety 

 of other metals ;: — Hungary, which is rich in gold. Sweden 

 and Finland have been long celebrated, and particularly for 

 iron and copper mines, which fonnerly supplied a great part 

 of the world, but now have much failed in their richness. The 

 quahty however of the Swedish iron and copper is still unri- 

 valled, Siberia has productive mines of the same metals. 



The rivers of Africa have long been known for the gold 

 found in their sands, and many parts of Asia have yielded the 

 precious metals as well as others. SjDain was celebrated for 

 its mines, and particularly of quicksilver or mercury and lead ; 

 and France has endeavoured to force its mines into notice, 

 though almost too inconsiderable to deserve it. 



In later times the great source of the precious metals has 

 been the southern parts of America, and most of the enterprize 

 of the adventurers to the new world may be attributed to the 

 abundance of them which was soon found to exist there ; and 

 from the time that Europeans gained footing, the quantity of 

 gold from the Brazils, and of silver tiom Mexico and Peru, 

 has been immense. 



Experience has taught us, as has been before observed, 

 that metals are only to be found in sufficient quantit}' to repay 

 Uie labour of procining them in certain rocks, which are there- 

 fore called metalliferous. 



In a former course of lectures these rocks and their general 

 position as relating to each other and to those of a different 

 order were described; and the subject has since been ably 

 illustrated here in Professor Brande's course on Geology. 

 It needs only be stated therefore that the most important are: 

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