DISEASES OF THE NERVOUS SYSTEM. oT 
General, irregular muscular contractions of various parts of the body, 
with unconsciousness, characterize what we regard as convulsions, 
and like ordinary spasms are dependent upon some disease or irrita- 
tion of the nervous structures, chiefly of the brain. No treatment is 
required; in fact, a general convulsion must necessarily be self- 
limited in its duration. Suspending, as it does, respiratory move- 
ments, checking the oxygenation and decarbonization of the blood, 
the rapid accumulation of carbonic-acid gas in the blood and the 
exclusion of oxygen quickly puts the blood in a condition to produce 
the most reliable and speedy sedative effect upon the nerve excitabil- 
ity that could be found, and consequently furnishes its own remedy 
so far as the continuance of the convulsive paroxysm is concerned. 
Whatever treatment is instituted must be directed toward a removal 
of the cause of the convulsive paroxysm. 
CHOREA, OR ST. VITUS’S DANCE, 
Chorea is characterized by involuntary contractions of voluntary 
muscles. This disease is an obscure disorder, which may be from 
pressure upon a nerve, cerebral or spinal sclerosis, small aneurisms 
in the brain, etc. Choreic symptoms have been produced by injecting 
granules of starch into the arteries entering the brain. Epilepsy and 
other forms of convulsions simulate chorea in appearance. 
Stringhalt is by some termed “ chorea.” This is manifested by a 
sudden jerking up of one or both hind legs when the animal is 
walking. This symptom may be very slight in some horses, but has 
a tendency to increase with age. In some the catching up of the 
affected leg is very violent, and when it is lowered to the ground the 
motion is equally sudden and forcible, striking the foot to the ground 
like a pile driver. Very rarely chorea may be found to affect one of 
the fore legs, or the muscles of one side of the neck or the upper 
part of the neck. Involuntary jerking of the muscles of the hip or 
thigh is seen occasionally, and is termed “shivering” by horsemen. 
Chorea is often associated with a nervous disposition, and is not 
so frequent in animals with a sluggish temperament. The involun- 
tary muscular contractions cause no pain, and do not appear to pro- 
duce much exhaustion of the affected muscles, although the jerking 
may be regular and persistent whenever the animal is in motion. 
Treatment.—In a few cases, early in the appearance of this affec- 
tion, general nerve tonics may be of benefit, viz, iodid of iron, 1 
dram; pulverized nux vomica, 1 dram; pulverized scutellaria (skull- 
cap), 1 ounce. Mix and give in the feed once a day for two weeks. 
Arsenic in the form of Fowler’s solution is often beneficial. If the 
cause is connected with organic brain lesions, treatment is usually 
unsuccessful, 
