safe formula, especially in dispensary
and ignorant class practice:

[Rx] [beta]-naphthol, ..................... [dram]ss-[dram]j
Ol. cadini, .......................... [dram]j
Ungt. sulphuris, .......... q. s. ad ... [Oz]j M.

The cautious use of a five to twenty per cent. chrysarobin ointment is
of value. Painting the patches with pure carbolic acid or trikresol
every ten days or two weeks sometimes acts well; it should not be
applied over large areas nor used in young children. Galvanization or
faradization of the affected parts may also be employed, and with,
occasionally, beneficial effect. Stimulation with the high-frequency
current by means of the vacuum electrode is also of value. When
practicable, the Finsen light can be applied with hope of benefit and
cure.

#Atrophia Pilorum Propria.#
(_Synonym:_ Atrophy of the Hair.)

#What do you understand by atrophy of the hair?#

An atrophic, brittle, dry condition of the hair, and which may be either
symptomatic or idiopathic.

#Describe the several conditions met with.#

As a symptomatic affection, the dry, brittle condition of the hair met
with in seborrh[oe]a, in severe constitutional diseases, and in the
various vegetable parasitic affections, may be referred to.

As an idiopathic disease it is rare, consisting simply of a brittleness
and an uneven and irregular formation of the hair-shaft, with a tendency
to split up into filaments (_fragilitas crinium_); or there may be
localized swelling and bursting of the hair-shaft, the nodes thus
produced having a shining, semi-transparent appearance (_trichorrhexis
nodosa_). This latter usually occurs upon the beard and moustache.

#State the causes of atrophy of the hair.#

The causes of the symptomatic variety are usually evident; the etiology
of idiopathic atrophy is obscure, but by many is thought due to
parasitism.

[Illustration: Fig. 39. Trichorrhexis Nodosa. (_After Michelson._)]

#What would be your prognosis and treatment in atrophy of the hair?#

Symptomatic atrophy usually responds to proper measures, but always
slowly; treatment is based upon the etiological factors.

For the idiopathic disease little, as a rule, can be done; repeated
shaving or cutting the hair has, in exceptional instances, been followed
by favorable results.

#Atrophia Unguis.#
(_Synonyms:_ Atrophy