This solution of corrosive sublimate is intended to facilitate the
exhibition of minute doses of the salt; f℥j contains gr. ½; when long
kept, or exposed to light, the oxy-muriate is decomposed, and _calomel_
is precipitated; (see _Hydrag: Oxymuriatis:_) or, what is more
dangerous, it is sometimes deposited in crystals, without decomposition;
a small portion of muriatic acid, or muriate of ammonia in the solution,
prevents this precipitation. DOSE, fʒss to fʒij, in an infusion of
linseed.