VI. METALS.— Sub-salts. 245 



White peecipitate, Mercurius prcEcipitatus albus, Calx hy- 

 drargyri alha, Murias hydrargyro-ammoniacalcy Hydrargyrus 

 prcocipitntus albus, the Hydrargyrum prcBcipitatum. album of the 

 London Pharmacopoeia, and the Hydrargyri suhmurias ammoniatum 

 of the Dublin. Dissolve corrosive sublimate and sal ammoniac, 

 ana Jvj, in half a gallon of water, add half a pint of liq. potas. 

 subcarb., wash the precipitate and dry. 



Hydrargyrum pr.ecipitatum album. Corrosive sublimate 

 ^vj, sal ammoniac ;=iiij, liq. potass, subcarb. half a pint, distilled 

 ater four pints, proceed as above. 



SUBMURIAS HYDRARGYRI AMMONIATUM. Add tO the L'qUOP 



poured off from the sweet precipitate in its manufacture, liq. 

 ammonias q. s. to throw down a new precipitate ; wash this with 

 cold distilled water, and dry it on blotting-paper; confounded 

 with sweet precipitate, docs not become black when rubbed with 

 lime water ; externally, to make a detergent ointment, in scabies 

 and other cutaneous affections. — Officinal preparations. Unguent. 

 Hydrargyri praecip. albi., L,D. 



Fulminating mercury. Dissolve 100 gr. of quik in nitric 

 acid 3Jss by meas. ; pour the solution into 2oz. by meas. of alcohol, 

 heat till an effervescence takes place ; the fulminating quicksilver 

 gradually forms as a white powder, to be well washed and dried. 

 Used as priming for fowling-pieces. 



Protophosphate of QUICKSILVER, P/iospkas protoxydi hy- 

 drargyri. Dissolve quik in nitric acid, add a solution of phosphate 

 of soda as long as a sediment falls, wash and dry the white sedi- 

 ment ; contains 26 protoxide of quicksilver, and ij'15 phosphoric 

 acid, equiv. 3^*75 ; dose, gr. ss to gr. j. 



Iodate of QUICKSILVER, lodas hydrargyri. Add a solution 

 of iodate of potash to the nitric solution of quicksilver, the iodate 

 of quicksilver falls down ; resembles Turpethum minerale; con- 

 tains 190 quik, 7'o oxygen, and 112*5 iodic acid. 



Borate of quicksilver, Boras hydrargyri. Borax saturated 

 with scxla 265 gr., calomel 222 gr. ; grind together, adding, when 

 well mixed, a little water ; then fill the mortar with water, and 

 let the red precipitate settle, wash and dry. 



2. Precipitate the solution of quik in nitric acid by a solution 

 of borax ; white. 



NiTRAS HYDRARGYRI AMMONIATO-NITRICUM. Dilute nitric 



acid lb. j, add carbonate of ammonia-water svj ; when the cfFer- 

 ▼wcence is over, add cjulk jviij, dissolve, evaporate, and crys- 

 tallize. 



pROTOlODlDi, «M ui i( hsiLVER, l^rotoiodiirr (h' mercurc. Pro- 

 tODitrate of quicksilver 100 gr., dissolve in water 400 gr., filter, 



