fiOO VII. EARTHS AND ALKALIES.- 



2. Dissolve cream of tartar lb. iij, in water 3 gall., add pearlash 

 q. s. to saturate the superfluous acid, as in making soluble tartar, 

 filter, add common salt Jxj, evaporate and crystallize. A more 

 agreeable purgative than Glauber's salt, but rather weaker. 



San DIVER, Sel de verre. Glass galU Fel vitri. The saline scum 

 that swims on the glass when first made ; used in tooth-powders. 



Black ash. The waste ley of the soap-maker, pumped out 

 of the boiler, evaporated in large iron boilers, and the salt sepa- 

 rated as it falls down. It consists of the sulphate, muriate, and 

 sebate of soda, and of potash, and, being put into a reverberatory 

 furnace, it is heated so as to partially decompose these salts, and 

 bring it to a pasty kind of fusion, at which time it is let to run 

 out of the furnace into an iron pan to grow cool and solid ; it is 

 then sold to the yellow soap-maker, or to the alum-maker. 



SALTS OF THE ALKALINE ROSINS. 



Sulphate of quinine, Sulphas cinchonce. Digest yellow 

 bark in weak sulphuric acid, made by adding 50 grains by weight 

 of oil of vitriol to each lb. j of water : add hot lime to render the 

 liquor clear, and wash away the extra lime from the precipitate ; 

 drain this precipitate and digest in rectified spirit, decant and 

 distil off the spirit, dissolve the rosin in hot water rendered sour 

 with sulphuric acid, and as the liquor cools, the sulphate of 

 quinine crystallizes. 



2. Powdered bark 21b., water 2 gall., oil of vitriol 2 oz., mea- 

 sures ; strain, add lime 8 oz., or enough to render the decoction 

 dark brown, with a reddish brown sediment ; proceed as above : 

 produce 5 or 6 drachms. Febrifuge, gr. viij equal to bark jj. 



QuiN.E HYDRO-FERRo-CYANAs. Prepared by boiling a mix- 

 ture of pure quina and Prussian blue in distilled water, and 

 then evaporating to dryness. One grain of this salt given one 

 hour before the accession of an intermittent, is stated by Dr. 

 Gouzel, of Antwerp, to have perfectly cured the disease. 



Quince phosphas. This may be obtained by the decomposition 

 of the hydro-chlorate of quina by the phosphate of ammonia. 

 This phosphate may be procured by saturating a given quantity 

 of pure phosphoric acid with ammonia, and driving off the excess 

 by means of gentle heat. 480 parts of the crystallized sulphate 

 of quina are then to be rubbed together with 1^00 of the hydro- 

 chlorate of barytes in crystals, and then eight times their weight 

 of distilled water is to be added, filtered, and the residuum 

 washed. The liquids are next to be mixed together, and diluted 

 with four times their weight of distilled water, after which the 

 diluted solution of the phosphate of ammonia is to be added by 

 degrees, carefully shaking it. When a precipitate no longer 



