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LXIV. Sketch of a Course of Lectures on Metallurgy; deli- 

 vered at the London Institution, Februaiy 1823. By John 

 Taylor, Esq. Treasurer of the Geological Society. 

 TN some lectures delivered on a former occasion in the Lon- 

 don Institution, Mr. Taylor had described the general 

 position of the ores of the various metals in the earth, and ex- 

 plained the processes which are used in mming to obtain them. 

 He now proposed to carry on ihe subject by giving a descrip- 

 tion of the metals themselves, or of those which are of most 

 importance in an oeconomical point of view, — some account of 

 the rocks and countries which produce their ores ; and then 

 to treat of the modes by which the metals are extracted and 

 rendered into their perfect state, fitted for the purposes of the 

 arts, and converted into their various forms or compounds. 



The only metals known to the ancients were seven : namely, 

 gold, silver, copper, iron, tin, lead, and mercury. 



But this list has been gradually extended ; and of late years 

 especially, the researches of chemists have added many to the 

 number. We may accordingly now enumerate as many as 40, 

 of which the knowledge of a considerable number results from 

 the brilliant discovery of our countryman Sir Humphry Davy 

 — that substances hitherto taken to be elementary, were but 

 oxides of metals, before unknown as such: and thus the bases 

 of some alkalies and several earths are perfectly ascertained 

 to belong to the class of substances now to be treated of. 

 These latter, and indeed some others, are only however to be 

 seen in their metallic state in the laboratories of skilful che- 

 mists ; and therefore are hardly within the range of the present 

 mquiry, which relates principally to the practical treatment 

 and uses of the metals. 



The following are the metals at present known 



Gold 



Silver 



Platina 



Nickel 



Palladium 



Rhodium 



Iridium 



Mercury 



Copper 



Iron 



Tin 



Lead 



Zinc 



Bismuth 



Antimony 



Cobalt 



Manganese 



Tellurium 



Titanium 



Tantalium 



Uranium 



Osmium 



Columbium 



Chrome 



Tungsten 



Molybdena 



Arsenic 



Sodium 



Potassium 



Lithium 



Barium 



Strontium 



Calcium 



Magnesium 



Glucine 



Thorine 



Yttrium 



Alumium 



Zirconium 



Silicum. 



The following are such as are usually seen in their metallic 

 state, in the popular sense of the word; and those principally 

 will be treated of which form the material of most of our me- 

 tallurgic processes. 



N n 2 1. Un. 



