PREFACE. vS 



are the lead mines of Derbyjhtre, Cardigan- 

 Jljtre and Flmtflnrey which have been worked 

 for ages, yet fliew no fign of the decHne of 

 their ftores. 



In all thefe, nature fports with great lux- 

 uriancy ; the cryftalUzed lead ore of Tralee *^ 

 the fibrous lead ore of Tipperary ; the lami- 

 nated lead ore of Lord Hop fcuns mines; the 

 cryftalized tins, and the figured ores of Zink^, 

 are equally noted for their elegance, fcarcity.,, 

 and richnefe. 



The ore of Zmk, or Lapis Calaminaris, is 

 found in vaft quantities in the counties of 

 Somerfet and Flint ; while Jf/ack lead or wadd^ 

 a fubftance fcarce known in other kinedoms^ 

 abounds in the mountains of Cumberland. 



To the Swedijh Petroleum, we may oppofe 

 the Well at Pitchfordy and that of St. Ca- 

 therines near Edinburgh, Our amber and 

 our jet, together with our inexhauftible 

 ftrata of coal found in fo many parts of this 

 kingdom, will, in the article of bitumens^, 

 give us the fuperiority over thefe fo much 

 boafted produdlions of Sweden^ 



* Jn the county of A^^ro'p 



a 4 To 



