BRITISH AND UNITED STATES PHARMACOPOEIAS. 207 
manner, by double decomposition between the sulphate of 
iron and carbonate of soda. The precipitate is immediately 
washed with cold water, and freed, by squeezing, from as much 
of the water as possible. The pulp that remains is triturated, 
without delay, with white sugar, previously in fine powder. 
The mixture is then dried at a temperature not much above 
120°. This saccharine carbonate is employed to make a new 
officinal pill of the Ed. Pharmacopoeia, consisting of four parts 
of the carbonate, and one of conserve of red roses. It is 
called Pilulae Jerri carbonatis, the name given to Vallet's 
ferruginous mass in the U. S. Pharmacopoeia of 1842. 
Ferri iodidi syrupus. Syrup of Iodide of Iron. This 
preparation, as we have already stated, is substituted in the se- 
cond edition of the revised Edinburgh Pharmacopoeia for the 
aqueous solution of the first, which has been abandoned. 
Soon after the protective power of saccharine matter against 
the full oxidation of iron was noticed by Klauer and Vallet 
in the case of the carbonate, several experimenters were in- 
duced to try its effects in other cases, where the prevention 
of oxidation was desirable. Dr. Christison states in his Dis- 
pensatory, that M. Frederking, of Riga, tried the influence 
of sugar on a recent solution of iodide of iron, and found that 
it rendered it permanent; and, applying the observation, Dr. 
Thomson, of the University of London, published in the 
Pharmaceutic Transactions, a formula for a syrup of iodide of 
iron, which, slightly modified, is that adopted in the last edi- 
tion of the Ed. Pharmacopoeia. Shortly after the promulga- 
tion of Vallet's formula in this country, Mr. William Proc- 
ter, Jr., of this city, applied honey to the protection of the 
tincture of protochloride of iron, (see vol. x, p. 272, January, 
1839, of this journal); and afterwards in a paper which ap- 
peared in the twelfth volume, (April, 1840,) he made known 
his equally successful results for the preservation of the solu- 
tion of iodide of iron by means of several saccharine sub- 
stances. The formula which he gave in the latter paper 
was substantially adopted by the revising Committee of the 
