232 VI. METALS.— Lkad. 



tin is co-existent in the mixture. Wiien acids are boiled in 

 vessels, part of whose tin lining is abraded, the acids take up 

 some of the tin, and deposit it on the abraded part, thus repairing 

 the damage in the same manner as brass pins are tinned, by boiling 

 with tin filings and cream of tartar. Acid syrups and stews are 

 and have been prepared for centuries in untinned copper vessels 

 without any ill effects, although in gentlemen"'s houses and ele- 

 gant inns they have occasionally produced of late direful effects: 

 but the common cooks use only pewter spoons for stirring, and 

 by leaving them in the liquid, render the acids ineffective upon 

 copper, which effect is not produced by the silver spoons of supe- 

 rior establishments. Although the salts of copper are violent 

 emetics, yet 3j of filings has been taken against the rheumatism ; 

 and Rouelle used to exhibit in his lectures a lock of green hair 

 he had himself cut from the head of an aged founder, who had. 

 much used that remedy. Equiv. 4. 



Bean-shot copper. In small lumps, like peas or kidney- 

 beans. Made by pouring a thin stream of melted copper into 

 boiling water. 



Feather-shot copper. In small thin rounds, with a fea- 

 thered edge ; by pouring the copper into cold water. Both are 

 used for making solutions of copper. 



Bronze powder, Aurum supliistlcum. Verdigris 8 oz., tutty 

 4 oz., borax, nitre, ana 2 oz., corrosive sublimate 3ij, made into 

 a paste with oil, and melted together : used in japan work as a 

 gold colour. 



IROX. 



Iron filings, Ferri Umaturce. Tonic and astringent; used in 

 chlorosis, gr. v — x, bis terve in die. — h^on turnim/s, Ferri ramenta^ 

 F. scobs. — Jro7i ivire, Ferri Jila. Only used in preparations, being 

 the purest, which alone can be drawn into wire ; equiv. o. 



Steel, Chali/bs, Mars. Made from iron, by stratifying or 

 melting it with charcoal, of which it takes up a minute portion : 

 the filings are sometimes used as a stimulant and tonic ; also in 

 fireworks. 



LEAD. 



Granulated lead. By melting new lead, pouring it in a 

 small stream, from an iron ladle with a hole drilled in its bottom, 

 into a pail of water ; equiv. 13. 



Lead dust, Pulvis Plumbi. By melting Dew lead, adding 

 bruised charcoal, and diffusing the lead among it, then pounding 

 and washing away the charcoal ; used by potters. 



Pewter. Lead hardened with tin, and in the best kinds with 



