the Analyses of M. Klaproth. 931 



This ore contains 



Oxide of lead - - - 71 



Sulphuric acid - - 24" SO 



Water of crystallization - 2 



Oxide of iron - - - 1 



9S-80 



I 



The oxide of iron must be considered rather as a mecha- 

 nical mixture of the ochrey crust with this ore, than as one 

 of its constituent principles. 



Analysis of the Sulphated Lead of LeadhUls. 



1 he sulphated ore of lead of Anglesey was the only one 

 known tiil the discovery of that of Leadhills in Scotland ; 

 the chemical principles of which are the same; but they 

 differ m their external characters, since it crystallizes in 

 tablets. These crystals are colourless, in several places 

 transparent, and have a very brilliant splendour. 



The vein of this ore is situated at Wanloch-head, near 

 Leadhills. 



When exposed on charcoal to the blowpipe it exhibits 

 the same pha^nomena as that of Anglesey. 



A hundred parts of these crystals of sulphated lead of 

 Leadhills contain 



Oxide of lead - - - 70-50 

 Sulphuric acid - _ - 25*75 

 Water of crystallizati<JH - 2-25 



98*50 



Analysis of tlie IVhite Lead Ore of Leadhills. 



The preceding sulphated lead ore crystallized tablets must 

 not be confounded with the white lead ore of the same 

 place ; though it is crystallized also in hexaedral tablets, in 

 which the lead is found combined with carbonic and not 

 with sulphuric acid. 



The specific gravity of this ore is 6480. It contains 

 Lead - - - - 77 



Oxygen - . - _ 3 



Carbonic acid - - - 16 



Loss and water of crystallization 2 



100 



P 4 Analysis 



