is calaminaris. On the parts not excoriated mercurial ointment, made of
one part of white calx of mercury and six of hogs' fat. Internally, after
venesection, gentle repeated cathartics. Lastly, the bark. Acid of vitriol.
Bolus Armeniae, or testacia. Antimonials. Decoction of interior bark of
elm.

9. _Zona ignea._ Shingles. This eruption has been thought a species of
herpes by some writers, and by others a species of erysipelas. Yellow or
livid vesicles appear, producing a corrosive ichor, which is sometimes
attended with a degree of fever. It is said to infest sometimes the thorax
and ribs, but its most general situation is on the small of the back, over
one kidney, extending forward over the course of one of the ureters.

There is reason to suspect, that this also is a secondary or sympathetic
disease, as well as the preceding one; but future observations are
required, before it can be removed to the fourth class, or diseases of
association. In three patients I have been induced to believe, that the
eruption on the loins was a translation of inflammation from the external
membrane of the kidney to the skin. They had, for a day or two before the
appearance of the eruption, complained of a dull pain on the region of one
kidney, but without vomiting; by which it was distinguished from nephritis
interna, or gravel; and without pain down the outside of the thigh, by
which it was distinguished from sciatica. In other situations the shingles
may sympathize with other internal membranes, as in a case published by Dr.
Russel (De Tabe Glandulari), where the retrocession of the shingles was
succeeded by a serious dyspnaea.

M. M. Venesection, if the pulse is strong. Calomel three or four grains,
very mild repeated cathartics. Poultice for a few days, then cerate of
lapis calaminaris, as in herpes. A grain of emetic tartar dissolved in a
pint of water, and taken so as to empty the stomach and intestines, is said
much to hasten the cure; compresses soaked in a saturnine solution are
recommended externally on the eruption; and cerate where there are
ulcerations. Desanet's Surgical Journal, Vol. II. p. 378. If this be a
vicarious disease, it should continue half a lunation; lest, on its
ceasing, the bad habits of motion of the primary disease should not have
been so perfectly dissevered, but that they may recur.

10. _Annulus repens._ Ring-worm. A prurient eruption formed in a circle,
affecting children, and would seem to be the