402 
PHARMACY. 
tion, that the sulphat and muriat of potass, 
w hich the pearl-ashes contain', may be sepa- 
rated by crystallization. 
Carbonas potassa; purissimus, pure car- 
bonat of potass (salt ot tartar). 
Take ot uS^ure supertartite of potass any 
quantity. ’^Slaving wrapped it in moist bi- 
bulous paper, or put it into a crucible, 
place it among live coals, that it may be 
burnt into a black mass. Being reduced 
to powder, subject it to a moderate heat 
in an open crucible, until it becomes white, 
or cinder-like, taking care that it does not 
melt. Then let it be dissolved in warm 
water, the liquor strained through linen, 
and evaporated in a clean iron vessel, 
stirring the matter assiduously towards the 
end of the evaporation with an iron spoon, 
that it may not adhere to the bottom of the 
vessel. A very white salt will remain, 
which is to be left for some time on the 
fire, until the bottom of the vessel is nearly 
of a red heat. When cold, the salt is to be 
preserved in a glass vessel well stopped. 
Aqua potassa?, water of potass, Ed. Aqua 
kali puri, Loud. 
l ake of newly prepared lime eight ounces ; 
c&fbonat of potass six ounces. Put the 
lime jnto an iron or earthen vessel, with 
twenty-eight ounces of warm water. The 
ebullition being over, immediately add the 
salt ; and the whole being completely mix- 
ed, close the vessel until they become 
cold. Now let them be well agitated, and 
poured into a glass funnel, the throat of 
which is obstructed with clean linen. Co- 
ver the upper orifice of the funnel while its 
neck is inserted in another glass vessel, 
that the water of potass may gradually 
drop through the linen into the lower ves- 
sel. When it lirst ceases to drop, pour 
into the funnel some ounces of water, cau- 
tiously, that it may swim above the mat- 
ter. The water of potass will now again 
begin to drop. In this manner is to be re- 
peated the a [fusion of water until three 
pounds have been liltred, which will be 
m the space of two or three days. The 
upper are to be mixed by agitation with 
the lower parts of the liquor, which is to 
be kept in a well stopped vessel. 
Aqua supercarbonatis potassa?, water of 
supercarbouat of potass. 
Take of water ten pounds; pure carbonat of 
potass one ouir e. Dissolve, and expose 
the solution to a stream of carbonic acid 
gas, which is produced from carbonat of 
time, sulphuric acid, of eacti three ounces, 
with three pounds of water cautiously and 
gradually mixed. The apparatus invented 
by Dr. Nooth i> well adapted to this pre- 
paration. If a greater quantity is required, 
VVoulfe’s apparatus is to be preferred. In 
proportion to the coldness of the air, and 
the extent of- pressure, the liquor will be 
better. It should be kept in well stopped 
vessels. 
Carbonas soda?, carbonat of soda, Ed, Na- 
tron pra-paratuin, Loud. 
Take of impure carbonat of soda any quan- 
tity ; bruise it, and boil it in water until all 
the salt is dissolved. Strain the solution 
through paper, and evaporate it in an iron 
vessel, that, after cooling, crystals may 
form. 
'Hie barilla of commerce. 
Aqua supercarbonatis sodse, water of su- 
percarbonat of soda. 
This is prepared from ten pounds of water, 
and two ounces of carbonat of soda, in the 
same mode as the supercarbonat of potass. 
Aqua acctitis ammonia, water of acetite of 
ammonia, Ed. Aq. ammonia? acetata?, Loud, 
'l ake of carbonat of ammonia any quantity. 
Pour on it as much distilled acetous acid 
as may be necessary exactly to saturate the 
ammonia. 
Acetis potassa?, acetite of potass, Ed. Kali 
acetatum. Loud. 
'Bake of pure carbonat of potass any quan- 
tity. Boil it with a gentle heat in four or 
five times its weight of distilled acetous 
acid, and at different times add more acid, 
until on the watery part of the former 
portion being nearly evaporated, the acid 
newly added occasions no effervescence. 
This will be the case when about twenty 
parts of acid have been consumed. Then 
let it be slowly dried. Let the remaining 
impure salt be liquefied with a gentle heat 
for a short time ; then dissolved in water, 
and strained through paper. If the lique- 
faction has been properly done, the strain- 
ed liquor will be limpid ; if not, it will be 
of a brown colour. Afterwards evaporate 
this liquor with a gentle heat in a shallow 
glass vessel, well closed, that it may not 
liquefy by the air. 
Potassa, potass, Ed. Kali purum. Loud. 
Take of water of potass any quantity ; eva- 
pora e it in a covered clean vessel of iron, 
until, the ebullition being finished, the sa- 
line matter flows smoothly like oil, which 
will be the case before the vessel is at a 
red heat. Then pour it on a clean iron 
plate ; cut it into small masses before it 
becomes hard, and immediately put them 
into a phial well stopped. 
Potassa cum ealce, potass with lime, Ed. 
Calx cum kali puro, Loud. 
Take of water of potass any quantity. Eva- 
porate to one-third in a covered iron ves- 
sel ; then mix with it as much newly 
slaked lime as may suffice to give it the 
consistence of a solid paste, which is to be 
kept in a stopt vessel. 
Sulphas potassae, sulphat of potass, Ed. 
Kali vitrioiutum, Loud. 
'lake of sulphuric acid, diluted with six 
times its weight of water, any quantity ; 
put it into a large glass vessel ; and gradu- 
ally drop into it of carbonat of potass, dis- 
solved in six times its weight of water, as 
much as may suffice perfectly to saturate 
the acid. The effervescence being finish- 
ed, liltre the liquor through paper ; and, 
after clue exhalation, put it aside that cry- 
stals may form. This salt may otherwise 
be made by dissolving the residuum of the 
distillation of nitrous acid in warm water, 
and saturating it with carbonat of potass. 
Sulphas potassa? cum sulplmre, sulphat of 
I potas , with sulphur. 
Take of nitrat of potass in powder, sublimed 
sulphur, equal weights. Throw them well 
mixed into a red-hot crucible, by small 
quantities at a time. The deflagration be- 
ing over, let the salt cool. Keep it in a 
glass phial well stopped. 
Tartris potassa?, tartrite of potass, Ed. 
i Kali tartarisatum, Loinl. 
' 8 
Take of carbonat of potass one pound: su- 
perhrtrite of potass three pounds, or as 
much as necessary ; boiling water fifteen 
pounds. To the carbonat of potass dis- 
solved in the water add gradually the su- 
pertartrite of potass rubbed to fine pow- 
der, as long as effervescence is excited, 
which generally ceases before three times 
its weight of carboiM of potass have been 
thrown in. When the liquor is cold filtre 
it through paper, and set it aside, that 
crystals may be formed. 
Dose as a purgative one ounce. 
Tartris potassa? et sods, tartrite of potass 
and soda, Ed. Natron tartarisatum, Lond. 
This is to be prepared from carbonat of soda 
and supertartrite of potass, in the same 
mode as tartrite of potass. 
A pleasant purgative. Dose an ounce. 
Phosphas soda;, phosphat of soda?. 
Take of bones burnt to whiteness and pow-. 
dered ten pounds ; sulphuric acid six 
pounds; water nine pounds. Mix the 
powder with the acid in an earthen vessel ; 
then add the water, and again mix. Keep 
the vessel in a water-bath tor three days ; 
then dilute the matter, by adding nine 
pounds more of boiling water, and strain 
through a strong linen cloth, pouring gra- 
dually over it boiling water, until all the 
acid is washed out. Put aside the strained 
liquor that the impurities may subside, 
from which pour it off, and evaporate to 
nine pounds. To this liquor, again poured 
off from its impurities, and heated in an 
earthen vessel, add carbonat of soda dis- 
solved in warm water, till it no longer ex- 
cites effervescence. Now strain, and put 
it aside, that crystals may form. These 
being removed, add, if necessary, to the li- 
quor, a little carbonat of soda, that the 
phosphoric acid may be completely satu- 
rated, and again prepare it by evaporation 
to form crystals as long as these can be pro- 
duced. Lastly, let the crystals be pre- 
served in ii vessel well stopt. 
A mild and useful cathartic. Dose one 
ounce. 
Sulphas soda 1 , sulphat of soda, Ed. Na- 
tron vitriolatum, Lond. (Glauber’s salt.) 
Dissolve the acidulous salt, which remains 
after the distillation of muriatic acid, iq 
water, and add to it chalk, in order to re- 
move the superfluous acid. Put it aside 
until its impurities have subsided; then 
having poured off the liquor, and strained 
it through paper, reduce it by evaporation, 
so as to lorm crystals. 
Dose one ounce, or more. 
Sulphuretum potassa?, sulphuret of potass, 
Ed. Kali sulphuratum, Lond. 
Take of carbonat of potass, sublimed sul- 
phur, of each eight ounces; having rubbed 
them together, let them be put into a large 
coated crucible, to which a cover being 
adapted, apply the fire cautiously, until 
the materials melt The crucible, when it 
has cooled, is to be broken, and the sul- 
phuret taken out, and preserved in a close- 
stopt phial. 
H ydro-sulphu return ammonia?, hydro-suV- 
plniret of ammonia. 
'i ake of water of ammonia four ounces. Ex- 
pose it in a chemical apparatus to the 
stream of gas which arises from sulplni- 
