quantity of the effusion is large its own volume retards the
process of absorption to a great extent, and consequently convalescence
is delayed. In severe cases the pulse becomes more frequent, the
breathing more hurried and labored, the flanks work like bellows, the
nostrils flap, the eyes stare wildly, the countenance expresses much
anxiety, and general signs of dissolution are plain. After a time
swellings appear under the chest and abdomen and down the legs. The
accumulation in the chest is called hydrothorax, or dropsy of the chest.
When this fluid contains pus the case usually proves fatal. The
condition of pus within the cavity is called empyema.

Pleurisy may affect only a small area of one side or it may affect both
sides. It is oftener confined to the right side.

_Treatment._--The instructions in regard to the general management of
bronchitis and pneumonia must be adhered to in the treatment of
pleurisy. Comfortable quarters, pure air, warm clothing to the body and
bandages to the legs, a plentiful supply of pure cold water, the
laxative feed, etc., in this case are equally necessary and efficacious.
The hot applications applied to the chest, as directed in the treatment
of pneumonia, are very beneficial in pleurisy, and should be kept up
while the symptoms show the animal to be in pain.

During the first few days, when pain is manifested by restlessness,
apply hot packs to the sides diligently. After four or five days, when
the symptoms show that the acute stage has somewhat subsided, mustard
may be applied as recommended for pneumonia. From the beginning the
following drench may be given every six hours, if the horse takes it
kindly: Solution of the acetate of ammonia, 3 ounces; spirits of nitrous
ether, 1 ounce; bicarbonate of potassium, 3 drams; water, 1 pint.

If the patient becomes debilitated, the stimulants as prescribed for
pneumonia should be used according to the same directions. The same
attention should be given to the diet. If the animal will partake of the
bran mashes, scalded oats, and grass, it is the best; but if he refuses
the laxative diet, then he should be tried with different kinds of feed
and allowed whichever kind he desires.

In the beginning of the attack, if the pain is severe, causing the
animal to lie down or paw, morphin may be given by the mouth in 5-grain
doses, or the fluid extract of _Cannabis indica_ may be used in doses of
2 to 4 drams.

If the case is not progressi