REVIEW OF THE DUBLIN PHARMACOPOEIA. 
15 
the product by a steam or water heat, and reduce it to a fine 
powder. 
Pulveres Effervescentes Citrati, are a kind of soda powders con- 
taining half a drachm of citric acid in one paper, and 33.4 grs. of 
bicarbonate of soda, or 39.4 grs. of bicarbonate of potassa in the 
other paper. A corresponding preparation with tartaric acid is also 
directed. 
Pulvis Rhei Compositus, is a mixture of two parts of rhubarb, 
six of magnesia and one of ginger. It is a good preparation, and 
adopted from the Edinburgh Pharmacopoeia. 
Alcohol, signifies alcohol sp. gr. .795, and prepared by distilling 
16 parts of alcohol of sp. gr. .818, with 10 parts of quick lime, 
rejecting the first ninth of the distillate. The process is like that 
of the Edinburgh Pharmacopoeia. 
Spiritus Fortior, is alcohol of sp. gr. .818. 
Spiritus Tenuior, is proof spirit (sp. gr. .920.) 
Essences. — Under this head we find a class of preparations con- 
sisting of volatile oils dissolved in alcohol, and about the strength 
of our tincture of oil of peppermint. These are substituted for the 
distilled spirits. They are employed pharmaceutically for prepar- 
ing the aromatic waters, and for aromatising mixtures. We be- 
lieve that such preparations are much more efficient and uniform in 
strength than the distilled spirits, and although they are 
liable to the objection, that it is not always possible to get the vo- 
latile oils pure and in good condition, yet even this objection will 
not counterbalance the advantages they present when made in this 
way. 
Antimonii Sulphuretum Prcecipitatum, is made by fusing black 
sulphuret of antimony and dried carbonate of potassa, boiling the 
resulting mass, previously reduced to powder, in water, and filtering 
the solution into diluted sulphuric acid ; the precipitate being sub- 
sequently washed and dried. 
Syrupus Acid Citrici, is simple syrup, containing six drachms 
and two thirds of citric acid to the pint, flavored with tincture of 
lemon peel. 
Syrupus Ferri Iodidi, contains but 34.16 grs. of the Iodide per fluid 
ounce, whilst our preparation has 48 grains in the same bulk. 
Syrupus Hemidesmi, is a syrup of the root of Hemidesmus In- 
dicus or Indian Sarsaparilla. 
