r 



I 



VI. METALS.—SuLPHURETs of. 229 



is extracted by clixiviation and crystallization. Coinp. of 3*5 iron, 

 with 4 sulph., equiv. 7*5. 



Chalybs cum sulphure pr.eparatus. With a red hot bar 

 of steel melt a roll of brimstone, so that it may fall into a vessel 

 of water ; separate the brimstone which falls at the same time into 

 the water, and reduce the chalybs into a fine powder. 



SuLPHURET OF IRON. By melting iron filings, or scales of 

 iron and brimstone, p. a?q. in a covered crucible ; melts easily, and 



kes sharp casts. 



SuLPHURETUM FERRi. Irou filings 6 oz., flowcrs of sulphur 

 I oz. ; mix together, and melt in a covered crucible. Used in 

 preparing hepatized ammonia. 



Black lead, llhomhohcBdral f/rapldte-mica^ Cai'huret of iroiiy 

 Per carhure de for, PhtmLum nu/rumi Cei'ussa niyra^ Plumbago^ 

 Graphites. Found in mines; derives its name from its colour, 

 composed of 92 parts iron and 8 charcoal ; used for pencils, 

 crayons, and the coarser sort to give a metallic lustre to other 

 bodies, or to diminish the friction, in cases where grease or oil 

 would be improper. 



LEAD. 

 Potter's lead oni:, Si/Iphnr ft of lead ; Galena. Found in 

 mines, breaks in cubes ; used by the potters in glazing earthen 

 vessels. 



quicksilver. 



Native cinnabar, Peritomons rvhijhhmde, BiauJphuret of 

 (piichsilver^ Durdar^ Chnuiharis. Found in mines ; liable to be 

 confounded with realgar, or red arsenic ; composed of S5 quick- 

 silver, with 4 sulph., equiv. 29. From Surat, China, and Batavia. 



Dutch vermilion, Sidplmretitm hydrargyri rnbrum^ P. E. 

 Cinimharis factitia. By grinding 1701b. of quicksilver and 501b. 

 of brimstone together, throwing the mixture by ladlesful into 

 heated earthen sublimers, where it takes fire; the su])erfiuous 

 sulphur being consumed, the mouths of the vessc*ls are then 

 covered with tiles, which stops the confiagration, and the subli- 

 mation commences, which is continued uniil the whole is risen up. 

 From Holland. 



HvDRAKGYRus 8ULPJIURATUS RUBER, Sulphuretuju kydrorgyri 

 ndtrum, P. D., P. L., 180f). Quicksilver 40 oz., sulphur 8*oz., 

 sublime : diaphoretic ; used in cutaneous diseases and gout, also 

 as a vermifuge, gr. x to 3ss: externally, 3ss, thrown upon a red 

 hot iron, is used as a fumigation to check the progress of venereal 

 ulcers in the tiiroat, nose, or niouth ; totally volatile by heat, 

 communicates no colour to spirit of wine. 



