_White Precipitate._
QUALITIES. _Form_, an impalpable powder of a snowy whiteness; _Odour_
and _Taste_, none. CHEMICAL COMPOSITION. It is a triple compound of
oxide of mercury 81, muriatic acid 16, ammonia 3 parts. SOLUBILITY. It
is insoluble in water, and in alcohol; when triturated with lime water
it does not become black. It is now only used in combination with lard
as an ointment; formerly it was administered internally, and Boerhaave
strongly recommends it as a safe and mild mercurial, and as seldom, if
ever, exciting copious salivation. OFFICINAL PREP. _Unguent._ _Hydrarg.
præcipitati albi._ L.D.