The administration is controlled by the systematic examination of the
urine for arsenic.
_The Administration of Mercury._--The success of the arsenical
preparations has diminished the importance of mercury in the treatment
of syphilis, but it is still used to supplement the effect of the
injections. The amount of mercury to be given in any case must be
proportioned to the idiosyncrasies of the patient, and it is advisable,
before commencing the treatment, to test his urine and record his
body-weight. The small amount of mercury given at the outset is
gradually increased. If the body-weight falls, or if the gums become
sore and the breath foul, the mercury should be stopped for a time. If
salivation occurs, the drinking of hot water and the taking of hot baths
should be insisted upon, and half-dram doses of the alkaline sulphates
prescribed.
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