fascia, a grooved director is gently pushed through the deeper tissues
till pus escapes along its groove, and then the track is widened by
passing in a pair of dressing forceps and expanding the blades. A tube,
or strip of rubber tissue, is introduced, and the subsequent treatment
carried out as in other abscesses. When the drain lies in proximity to a
large blood vessel, care must be taken not to leave it in position long
enough to cause ulceration of the vessel wall by pressure.

In some abscesses, such as those in the vicinity of the anus, the cavity
should be laid freely open in its whole extent, stuffed with iodoform or
bismuth gauze, and treated by the open method.

It is seldom advisable to wash out an abscess cavity, and squeezing out
the pus is also to be avoided, lest the protective zone be broken down
and the infection be diffused into the surrounding tissues.

The importance of taking precautions against further infection in
opening an abscess can scarcely be exaggerated, and the rapidity with
which healing occurs when the access of fresh bacteria is prevented is
in marked contrast to what occurs when such precautions are neglected
and further infection is allowed to take place.

_Acute Suppuration in a Wound._--If in the course of an operation
infection of the wound has occurred, a marked inflammatory reaction soon
manifests itself, and the same changes as occur in the formation of an
acute abscess take place, modified, however, by the fact that the pus
can more readily reach the surface. In from twenty-four to forty-eight
hours the patient is conscious of a sensation of chilliness, or may
even have a rigor. At the same time he feels generally out of sorts,
with impaired appetite, headache, and it may be looseness of the bowels.