732

ZINCUM.— ZINC.

then treat it in the manner directedfor the preparation of chalk.

B.

Prepared expressly.

1. In the dry way; Flowers of Zinc. — FloresZinci, Nihil album, Pompholex, Lanaphilosophica, Oxydum zincicum seu Zincialbum seu Zinci per se, Oxodes Zincialbum, Calx Zinci, ¿incum oxydatumalbum.

Dubl. ; Edinb. ; Amer. ; Amst. ; Ant. ;Austr. ; Batav. ; Bavar. ; Belg. ;Bruns. ; Hisp. ; Gall. ; Fenn. ; Ferr. ;Fuld. ; Genev. ; Hann. ; Mass. ; Lipp. ;Lusit. ; Palat. ; Pol.; Ross.; Sax.;Suec. ; Wirtbm. ; Herb:p. ; Brugna-telli ; Coxe ; Piderit ; Spielmann;Swediaur; Van Mons.

Oxidum Zinci.

Place a large crucible ill a furnacefilled with burning coals in such amanner as to be a little inclined to-wards its mouth, and when the bottomof it has become of a moderate redheat, throw into it a piece of zinc ofabout the weight of a dram. Thezinc is soon inflamed and convertedinto white floculi, which are fromtime to time to be removed from thesurface of the metal, by means of aniron spatula, that the combustion maybe more complete; when the inflam-mation has ceased remove the oxidefrom the crucible. Then throw inanother piece of zinc, and proceed inthe same manner. Finally, let theoxide be prepared in the same manneras the impure carbonate of zinc.(Edinb.)

R. Zinc, in small pieces,

any quantity.

Throw those, at intervals, into asufficiently large crucible, heated towhiteness, and placed with its mouthinclined towards the mouth of thefurnace. After each piece of zinc isthrown in, invert over the crucibleanother crucible, but loosely, so a«not to exclude the air. Preserve thewhite, sublimed, light powder foruse. (Dubl.)

R.

Zinci Oxydum.

Sulphate of Zinc,Distilled Water,

R. Zinc, any quantity.

Put it into a large crucible placed amongburning coals, and augment the heat till themetal enters into fusion, and inflames ;then cover the crucible with another in-verted, and afterwards separate the floculiwhich collect in the latter.

2. In the moist way ; Magistery of Zinc. —Mayisterium Zinci, Zinci prœcipitatvm.

Amst. ; Dan. ; Gall. ; Ferr. ; Hann. ;Lipp. ; Olden. ; Borus. ; Sax. ; Van

Mons.

(LOND.)

one pound,one pint.Dissolve ; then add

Solution of Ammonia, one part,or as much as may be sufficient toprecipitate the oxide of zinc entirely.Pour off the liquor; wash the powderrepeatedly with distilled water, anddry it by the heat of a sand-bath.

Dissolve sulphate of zinc in a sufficientquantity of water, and pour gradually intothe solution another of subcarbonate ofsoda or of potass, till no more precipitate isformed. Wash and dry this.

This product is subcarbonate of zinc :Gall, speaks of it twice, under the title ofoxide of zinc by precipitation and of carbo-nate of zinc- — The calcination for a quarterof an hour which Sax. requires the preci-pitate to be subjected to, renders it yellow,but does not bring it to the state of pureoxide.

Oxide of zinc is employed externally asastringent, and internally as anti-spasmodicand emetic. It has been extolled in epilepsy,hysteria, and neuralgias. — Dose, from sixgrains to half a dram, in the form of pills.

ANTI-SPASMODIC POWDER.

Pulvis Zinci oxydati albi. (Fuld. ; Au-gustin)

R. Oxide of Zinc, twelve grains.

Sugar, one dram.

Divide into six papers. — Dose, one,morning and evening, in hooping roughand the convulsive diseases of children.(Augustin)

R. Oxide of Zinc, one grain.

Sydenham's Laudanum, one dram.Sugar, one scruple.

Mix. — To be taken every three hours, inthe spasms of children. (Augustin)