nvolved, itching, variable amount of irritation, and, above
all, the presence of the pediculi and their ova.

[Illustration: Fig. 82.
Pediculus Pubis x 25. (_After Duhring._) Female. Dorsal surface.]

#Name several applications prescribed for pediculosis pubis.#

A lotion of corrosive sublimate, one to four grains to the ounce;
infusion of tobacco; a ten to twenty per cent. ointment of oleate of
mercury; ammoniated mercury ointment, and a five to ten per cent.
[beta]-naphthol ointment. Repeated washings with vinegar or dilute
acetic acid, or with alkaline lotions, will free the hairs of the ova.

#Cysticercus Cellulosae.#

#Describe the cutaneous disturbance produced by the cysticercus
cellulosae.#

The presence of cysticerci in the skin and subcutaneous tissue gives
rise to pea to hazelnut-sized, rounded, firm, movable tumors which, when
developed, may remain unchanged for months. The parasites are disclosed
by microscopic examination.

Most of the cases have been observed in Germany.

#Filaria Medinensis.#
(_Synonym:_ Guinea-worm.)

#State the character of the lesions produced by the filaria medinensis.#

The young microscopic worm penetrates the skin or deeper tissue, where
it grows gradually, finally reaching several inches or more in length
and about a half-line in thickness; inflammation is excited and a
tumor-like swelling makes its appearance, which, sooner or later,
breaks, disclosing the worm. It may also present a cord-like appearance.
It is rarely met with outside of tropical countries.

Treatment consists in gradual extraction, or in the injection of a
corrosive sublimate solution (1:1000) into the forming tumor. Asafetida
internally has been found to be curative, the parasite being destroyed
and subsequently absorbed or discharged.

#Ixodes.#
(_Synonym:_ Wood-tick.)

#State the character of the cutaneous disturbance produced by the ixodes.#

The tick sticks its proboscis into the skin and sucks blood until it is
several times its natural size, and then falls off; an urticarial lesion
results. If caught in the act the animal should not be forcibly
extracted, as its proboscis may be thus broken off and remain in the
skin, and give rise to pain and inflammation. It may be made to
relinquish its hold by placing on it a drop of an essential