the chronic inflammation which
follows the bruises received by cattle in lying down and in rising, or they
may be due to falls on uneven, hard ground.

_Treatment for hygromata._--When the swelling first appears cold water
should be applied, followed later by bandaging with cloths wrung out of
warm water. If the swelling is soft, it should be punctured at the lowest
point, and afterwards the cavity should be syringed with Lugol's solution.
If the tumor is hard and nonfluctuating, a mercurial blister may cause
absorption and at the same time prevent further injury to the part by
making it more painful, thus sparing it.

SEROUS CYSTS.--These swellings are another variety of extravasation cysts,
and are caused by such injuries as butting, running against hard objects,
and shipping bruises, which are followed by an outpouring of blood and
lymph into the tissue spaces. These cysts develop rapidly and may reach the
size of a man's head or even larger. They are soft, edematous, and hot at
first and contain a serous or blood-tinged fluid. Later, partially
organized clots and shreds of a fibrinous nature and of a gelatinous
consistence are formed within, and the temperature of the swelling is
reduced. They appear on the surface of the body, especially on the belly
and flank of cattle.

_Treatment of serous cysts._--Treatment consists in opening the cyst at the
most dependent point with a sharp knife. The cavity should be washed out
twice daily with a 5 per cent solution of carbolic acid, and drainage
encouraged by keeping the incision open.

DERMOID CYSTS.

These cysts have a wall which is almost an exact duplicate of the structure
of the skin, and frequently contain epidermal structures, such as hair and
teeth, which, in the development of the embryo, have been misplaced. Thus
we may find in an ovary or testicle a dermoid cyst, containing a tooth or a
ball of hair. Dental cysts are included in the class above.

DENTAL CYSTS.--It happens occasionally that the teeth of cattle, instead of
developing normally within strong supporting alveolae, remain inclosed
within a cystic membrane, which assumes a tumorlike character. One tooth
may be included alone in the cyst or a number may be inclosed together.
However this may be, the malformation progresses, especially if confined to
the incisor teeth, until the remaining teeth that began to develop normally
are crowded out of position and rendered useless. The tumor may reach the