washed with soap, or rubbed with alcohol and spirits of camphor, equal
parts. Treatment should be persisted in for a long period if necessary.

URTICARIA, "NETTLERASH."--Urticaria is characterized by roundish elevations
that appear quickly and become scattered over a part or the whole surface
of the skin. They are caused by an inflammatory infiltration of the deeper
layers of the skin. Horses and hogs are most frequently affected.

_The causes_ of urticaria are irritating juices of certain plants,
secretions of flies, ants and some caterpillars, irritating drugs,
scratching, sweating and the action of cold on a warm skin. It has been
observed in connection with the feeding of certain leguminous feeds and
digestive disturbances. Horses that are fat, or putting on flesh rapidly,
seem to be predisposed to this disorder. Urticaria may occur in certain
infectious diseases.

_The characteristic symptom_ is the formation on the skin of roundish
elevations or "hives." There may be an elevation of body temperature and
partial loss of appetite. Small animals may act restless and show evidence
of itching or pain. This symptom is very common in hogs. The eruption may
last only a few hours or a few days, or, because of the animal's scratching
or rubbing the part, the skin may become scabby and small pustules form.

An important _preventive measure_ is to avoid the use of agents capable of
irritating the skin and producing urticaria when treating parasitic skin
diseases. It is very advisable to give the animal a saline cathartic (Epsom
or Glauber's salts). The skin may be washed with cold water, or a weak
water solution of permanganate of potassium.

ACNE, "SUMMER RASH."--In this skin disease the oil glands and hair