PHARMACY. 
NVithout smell or taste, effervescing withacids. 
It is not, however, saturated with carbonic 
acid. By decomposing sulphate of magne- 
sia by an alkaline carbonate, without the 
application of heat, carbonate of magne- 
sia is gradually deposited in transparent, 
brilliant, hexagonal crystals, terminated by 
an oblique hexagonal plane, and soluble in 
about four hundred and eighty times its 
weight of water. The crystallized carbo- 
nate of magnesia consists of fifty acid, 
, twenty-five magnesia, and twenty-five wa- 
ter ; the sub-carbonate consists of forty- 
eight acid, forty magnesia, and twelve wa- 
ter; and the carbonate of commerce of 
thirty-four acid, forty-five magnesia, and 
twenty-one water. It is decomposed by 
all the acids, potash, soda, baryte, lime, 
and strontian, the snlphate, phosphate, 
nitrate, and muriate of alumina, and the 
auper-phosphate of lime. 
Class IV. Sulphukea. 
The preparations under this head are 
few ; we need only enumerate the two fol- 
lowing ; 
Sulphur lotum, Lond, washed flowers of 
sulphur. 
Sulphur prajcipitatum, Lond. precipi- 
tated sulphur. 
In preparing this last, instead of dissolv- 
ing sulphuret of potash in water, we may 
gradually add sublimed sulphur to a boiling 
solution of potash, until it be saturated. 
When the sulphuretted potash is thrown 
into water, it is entirely dissolved, but not 
without decomposition, for it is converted 
into sulphate of potash, hydroguretted sul- 
phuret of potash, and sulphuretted’ hydro- 
guret of potash. The two last compounds 
are again decomposed on the addition of 
any acid. The acid combines with the pot- 
ash, sulphuretted hydrogen flies off in the 
form of gas, while sulphur is precipitated. 
It is of little consequence what acid is em- 
ployed to precipitate the suiphur. The 
London College order the sulphuric ; while 
the Dublin College use nitrous acid, proba- 
bly because the nitrate of potash formed 
is more easily washed away than sulphate 
of potash. 
Precipitated sulphur does not differ from 
well-washed sublimed sulphur, except in 
being much dearer. Its paler colour is ow- 
ing to its more minute division, or, accord- 
ing to Dr, Thomson, to the presence of a 
jittle water ; but from either circumstance 
it derives no superiority to compensate for 
the disagreeableness of its preparation. 
These are all the more simple prepara- 
tions of sulphur in common use. There are 
various preparations into which sulphur en- 
ters as an ingredient ; but such as consti- 
tuting compounds of the general nature of 
metals, alkalies, oils, &c. will be found 
under those classes. 
Class V, Metallica. Metalline PuEPAr 
RATIONS. 
The metalline prepartions are very numer- 
ous, especially those of antimony and quick- 
silver. 
Sulphuretum antimonii prseparatum, £din. 
prepared antimony. 
Oxidum antim, cum sulphure per nitra- 
tem potassae, Bdin. crocus of antimony, 
Lond. 
Oxidum antimonii, cum sidphure, vitrifi- 
catum, vitrified antimony, Lond. glass of 
antimony. 
Sulphuretum antimonii praecipitatum, 
precipitated sulphuret, or sulphur of anti- 
mony, Lond. 
Murias antimonii, Edin. muriated anti- 
mony, Lond. butter of antimony. 
Oxidum antimonii cum phosphate calcis, 
Edin. pulvis antimonialis, Lond. antimonial 
powder. 
Tartris antimonii, tartarised, or tartrite of 
antimony. 
, Vinum tartritis antimonii, Edin. tartar 
emetic, antimonial wine, Lond. 
Nitras aigenti, Edin. argentum nitratum, 
Lond. nitrate of silver, lunar caustic. 
iErugo pra;parata, Lond. Dub. prepared 
verdigrease, or carbonate of copper. 
Solutio sulphatis cupri composita, Edin. 
styptic water. 
Ammoniaretum cupri, Edin. ammoniacal 
copper. 
I Aqua cupri ammoniati, Lond. water of 
the same. 
Ferri limatura purificata, Edin. purified 
iron filings. 
Carbonas ferri, Edin. rubigo ferri, Lond, 
carbonate, or rust of iron. 
Sulphas ferri, Edin. vitriolated iron, Lond. 
sulphate of iron. 
Tinctura muriatis ferri, tincture of muri- 
ate of iron, Lond. 
Murias ammoniae et ferri, martial flowers, 
ammoniacal iron, Lond. 
Tinctura ejusdem, tincture of the same. 
Tartris ferri, tartrite of, or tartarised, 
iron, Lond. 
Vinum ferri, Lond. wine of iron. 
