lly been noted. Eosinophile
cells have been found both in the vesicles and the blood. In some
instances--exceptionally, it is true--the disease has appeared shortly
after vaccination.

#Mention the diagnostic features of dermatitis herpetiformis.#

The multiformity of the eruption, the characters of the lesions, the
disposition to grouping, the absence of tendency to form solid sheets of
eruption (as in eczema), the intense itching, history, chronicity and
course. In doubtful cases, an observation of several weeks will always
suffice to distinguish it from eczema, erythema multiforme, herpes iris
and pemphigus, diseases to which it at times bears strong resemblance.

#Give the prognosis of dermatitis herpetiformis.#

An opinion as to the outcome of the disease should be guarded. It is
exceedingly rebellious to treatment, and relapses are the rule.
Exceptionally the bullous and pustular varieties prove eventually fatal.
The erythematous and vesicular varieties are the most favorable.

#State the treatment to be advised.#

There are no special remedies. Constitutional treatment must be
conducted upon general principles. A free action of the bowels is to be
maintained. In occasional instances arsenic in progressive doses seems
of value. Externally protective and antipruritic applications, such as
are employed in the treatment of eczema and pemphigus, are to be
employed:--

[Rx] Ac. carbolici, ....................... [dram]j-[dram]ij
Thymol, .............................. gr. xvj.
Glycerinae, ........................... [Oz]ss-[Oz]j
Alcoholis, ........................... f[Oz]ij
Aquae, q.s., ......... ad ............. Oj. M.

Other valuable applications are: lotions of carbolic acid, of liquor
carbonis detergens, of boric acid; alkaline baths, mild sulphur ointment
and carbolized oxide-of-zinc ointment, and dusting-powders of starch,
zinc oxide, talc and boric acid. A two- to ten-per-cent. ichthyol lotion
or ointment is sometimes of advantage; thiol employed in the same manner
has also been commended.

#Psoriasis.#

#Give a definition of psoriasis.#

Psoriasis is a chronic, inflammatory disease, characterized by dry,
reddish, variously-sized, rounded, sharply-defined, more or less
infiltrated, scaly patches.

[Illustration: Psoriasis.]

#At what age does psoriasis usually first make its appearance?#

Most commonly between the ages o