VI. METALS — Oxides of. 239 



Oxide of tin, Oxidiim stanni. Dissolve tin in aqua regia 

 made of nitric and muriatic acid, in a small vessel covered to 

 prevent the absorption of air; and immediately pour it into a 

 solution of subcarbonate of potash sufficient to saturate the acid ; 

 filter and wash. 



SPELTER. 



Lapis calaminaris, Calamina, Carbonas zinci impurus. 

 Found in mines ; drying, astringent : used in ointments ; but 

 cawk, sulphate of barytes, coloured, has been lately sold for it ; 

 used also to furnish zinc, and for making brass. 



TuTTY, Tut'ia, Tuthia, Oxidum zinci impuntm. The sublimate 

 collected in the chimneys of furnaces in which ores mixed with 

 lapis calaminaris arc smelted, this sublimate being mixed with 

 clay on cylindrical moulds and baked ; or it is collected during 

 the roasting of blende, attaching itself to the upper part of the 

 furnace : drying,*" astringent ; used in eye-waters and eye-oint- 

 ments. 



Flowers of zinc. Oxide of zinc, Flores zinci, Zincum calci- 

 natum, Zinci oxidum, P. L. before 1824. Procured by burning 

 zinc in a long deep crucible, placed sideways in a furnace, so as 

 to collect the flowers conveniently as they form : antispasmodic ; 

 used in epilepsy, gr. v to x ; also in painting, as a substitute for 

 white lead; aries very slowly, requires white vitriol to be added; 

 com p. of 4'^5 zinc and 1 oxyg., equiv. b'25. 



Diaphoretic calaminaris. Lap. calam. 4 oz., nitric acid 

 Ibj. ; dissolve, decant, distil to dryness, powder, and wash the 

 residuum ; sudorific, gr. x to 1. 



PoMPHOLix, Nihil album. Collected in the smelting furnaces, 

 wherein zinc ores or brass are melted ; used in ointments for 

 tutty. 



Magistery of lapis calaminaris, Hi/drated oxide of zinc. 

 Dissolve lapis calaminaris in muriatic acid, and add subcarb. of 

 ammonia water to precipitate it : wash and dry ; emetic, ca- 

 thartic, gr. iij to viij. 



Zinci oxidum, P. L. 1824. Sulphate of zinc 3xij, aq. dist. 

 Oj ; dissolve, add liquor ammoniac q. s., wash the precipitate, 

 and dry. 



antimony. 

 Protoxide of antimony. Powder of Ahjumth, Mrnmrius 

 vita;. Pour butter of antimony into distilled water, wash the 

 f)r< cipitate, and dry it by a gentle heat ; comp. of 5'5 ant. with 

 1 "xyg., cqniv. 6o. 



2. Digest lib. of liver of antimony for a day in three pints of 



