ollow in a few hours.
In most cases recovery takes place in a few days or weeks.

Treatment.--Persons who are engaged in such work should change very
gradually from a great depth to the surface, and should not go into the
outer air suddenly.

MYELITIS.--Myelitis is an inflammation of the spinal cord.

Causes.--It may occur at any age, and is more common in male than in
female. The exciting causes are prolonged exposure to severe colds, too
great mental and physical exertion, sexual excess, blows, bleeding into
the cord, alcoholic excess, acute infectious diseases, syphilis, etc.

Symptoms.--These depend upon the location of the inflammation and the
severity. The onset may be sudden or gradual--when it is sudden, there may
be a chill followed by a fever of 101 to 103 degrees--general feeling of
illness, loss of appetite, with coated tongue and constipation. There may
be over-sensitiveness to pain and touch. Pain may radiate from the back
into the limbs, with numbing and tingling of the limbs. The urine may be
retained or may dribble away. Usually there is obstinate constipation.
There is frequently the feeling of a band around the body. Paralysis may
follow in the lower extremities and higher up, sometimes, depending upon
how high up in the cord the inflammation exists. This paralysis may cause
no motion of the limbs or produce an exaggerated contracting of the
affected muscles, the knees being drawn up on the abdomen and the heels
touching the buttocks.

[NERVOUS DISEASES 305]

Recovery.--Chances for recovery depend upon the cause. Most cases are
chronic and may last for years.

Treatment.--Treatment depends also upon the cause. Rest in bed;
counter-irritation, wet cupping, with care on account of bed sores. A
water-bed from the first may prevent bed-sores. The urine must be drawn if
it is retained. The medical treatment must be carefully given and a
physician of experience should be obtained.

LOCOMOTOR ATAXIA. Tabes dorsalis. Posterior Spinal Sclerosis).--A
hardening (sclerosis) affecting the posterior parts of the spinal cord and
characterized by incoordination, which means a condition where a person is
unable to produce voluntary muscular movements; for instance, of the legs,
etc., loss of deep reflexes to bend them back; disturbances of nutrition
and sensation, and various affections of sight.

Causes.--This is a disease of adult life, persons under twenty-five being
rarely affected, and is more c