Howard’s or Jewel’s Hydro-sublimate, (cailed Howard 
Patent Calomel,) is prepared by causing the salt, in the act 
of sublimation, to be exposed to aqueous vapour, and be 
- received in water. It is in a state of very minute division; 
is lighter than common calomel in the proportion of 3 to 
5, and cannot contain any of No, 317. The preparation 
in the French code according to the following title, is simi- 
lar to the Hydro-sublimate, viz. * Murias Mercurii duleis 
mediante aqua subtilissime divisus, juala methodum Josia 
Jewel.” —This calomel is preferable to the common. The 
calomel of Riverius, was a compound of Hydrarg. sub- 
mur. Di. and scammony, grs. vii.* 
_ For incompatible substances, see tables at end of Vol. I. 
_-.. Megprcat Properties anp Usrs.. The most extensively use- 
ful, and most generally employed mercurial of the whole — 
list, and one of the most important remedies of the Materia 
_ Medica—is a universal stimulant—sialagogue, cathartic,’ 
_ alterative, diuretic, diaphoretic ; and produces a multifari- 
ous series of penckor spcrations on the chorea : is 
consequently capable of doing infinite mischief, in careless 
hands; and should no wate be prescribed in domestic 
