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CALCINED MAGNESIA. 455

Therapeutic Uses.—Magnesia is administered in acidity of the
stomach, heartburn, sick headache and kidney affections, as an
antacid, and in combination with other agents in the diarrhoea of
children. It is also an efficient aperient, alone or in a little milk.
Dose.—Of magnesia, as a laxative, gr. x to as an antacid,
5j ;
3j. Of a preparation known as " Henry's," the dose is half the
quantity just given.
Dental Uses.—Magnesia is employed in dental practice, chiefly
for its antacid properties, as an ingredient of dentifrices ; in solu-
tion in the form of a gargle, to counteract the effect of acid medi-
cines upon the teeth ; also as an ingredient of remedies for infantile
diarrhoea during the period of dentition ; and also to change an
acid condition of the oral fluids, by being rubbed between the
teeth and permitted to remain for a short time.
Magnesium Hydrate.—Dr. E. C. Kirk recommends Phillips'
Milk of Magnesia, which consists of precipitated magnesium hy-
drate held in suspension in water, for contracting the injurious
action of acid secretions, especially in erosion cases. It is applied
in the same way that lime-water or precipitated chalk is used for
the purpose of bringing about an alkaline condition of the oral
fluids, by neutralizing the excess of acids present. A teaspoonful
of the preparation taken into the mouth and allowed to float
around over the teeth coats them with a slight film of magnesium
hydrate, which protects the tooth-surface from the acid action for
a number of hours. It should be used three times daily, after
meals, and for erosion, night and morning.
DENTAL FORMULA.
I^or Infantile Bilious Diarrhcea. For Infantile Mucous Diarrhoea,
Eherle.
CONDIE.
Magnesise .gr.x
. calc. . .
R. Magnesia calc. . . . gr.xxiv Bals. copaibse . . 5J
Calomel gr-ij-iij
Spir. aether nit. . . • 3 "J
Ipecacuanha .... gr.ij-iij Sacch. alb • 3y
Ext. hyoscyami . . . gr.iv-vj. M. Aq. cinnamoncinnamon . . . . . . . • Jiij. M.
Aq.
JiiJ-
F. ch. No. xij. • SiGNA.—A teaspoonful every 2 or 3
hours; each dose to be followed in
the course of an hour by the fifth of
SiGNA.—One to be given every 2 or 3
hours. a grain of Dover's Powder.