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DENTAL MEDICINE.
55.1:
resulting gas being distilled over through mercury into water,
which holds if in solution, and which is then filtered to remove
the free silicon which precipitates, the result is hydro-fluosilicic
acid.
Medical Properties and Therapeutic Uses.—Sodium silico-fluo-
ride, in the form of a white powder, is antiseptic, disinfectant
and styptic. Experiments with this salt by Mr. Wm. Thom-
son, F. B. F. C, F. C. S., show that the compounds of fluorine
were powerful disinfectants, and of these the sodium silico-fluo-
ride was the most serviceable. It has been employed as a sub-
stitute for peroxide of hydrogen on account of the changeable
nature of the latter agent. Even in a saturated solution, sodium
silico-fluoride is not an escharotic coagulant, but it is a slight irri-
tant in such a form, which is not a positive disadvantage in the
treatment of some affections, such as alveolar pyorrhoea for ex-
ample.
Dental Uses.—Sodium silico-fluoride has been used with good
results in cases of putrescent pulps, chronic alveolar abscesses,
pyorrhcEa alveolaris. Also as a deodorizer in pulp canals by de-
stroying the putrescent hydrogen. As a disinfectant, it is power-
ful enough, even in weak solution to antagonize, in a marked de-
gree, the germs of putrefaction ; as a coagulant, it is non-escha-
rotic ; as a deodorant, it is strong enough to destroy the most
penetrating of putrefactive odors; as a stimulant, it is powerful
enough in full solution to bring about the formation of new tissue,
and not act as an irritant to surrounding tissue ; it is compara-
tively unchangeable. Such properties may render it one of the
most useful salts in the dental pharmacopoeia.

SOZOIODOL.
Sozoiodol contains more than 50 per cent, of iodine, and is
antiseptic and disinfectant, and is a much better prepared combi-
nation than that first prepared under this name. It is employed
in the form of a five per cent, watery solution, in powder, and
also in a form known as zinc-sozoiodol in the strength of a two
per cent, solution.
Therapeutic Uses.—Sozoiodol is valuable as an antiseptic and