FOREIGN BODIES, 125. 
extraction offers no serious difficulty. Leave the work of encystment. 
and watch the progress of the changes. It is in conformity to this rule, 
that little projectiles and other metallic bodies are left in the tissues. 
Penetrating wounds should not be explored with dirty instruments or 
fingers. Cut the hair round the traumatism, disinfect it with free an- 
tiseptic irrigation, cover it with iodoform, collodion, and, if possible, 
with a wadding dressing. Such are the regulations to follow. Extrac- 
tion is advised only for projectiles immediately under the surface of the 
skin, and requiring only slight incision. If the foreign bodies are pro- 
truding from the surface of the skin, they must be removed immediately 
with all necessary care, and the wound must be treated like those result- 
ing from punctures. (See Gun Shot Wounds and Wounds by Pricking In- 
struments.) 
More or less soiled foreign bodies, introduced into any region and 
situated superficially, are extracted with forceps after the disinfection 
and division of the tract which they have made. The interference is. 
the same for similar bodies lodged deeply in a muscular region—neck, 
shoulder, croup, or thigh—where only important blood-vessels and 
nerves are to be avoided. Abscesses produced by foreign bodies which 
have run through the mucous membrane of the mouth, pharynx, ceso- 
phagus, stomach, or intestines, and have migrated into the tissues, do- 
require special attention. Whether situated on the head, neck, thorax, 
or abdomen, as soon as fluctuation is manifest, they must be punctured, 
the injuring body extracted, and antiseptics applied. For those which 
appear on the thoracic or abdominal walls, the diagnosis is sometimes 
difficult. 
Generally, the cicatrization of the tract made by the foreign body 
takes place quickly. It may, however, leave a fistula, After extract- 
ing a pair of scissors from an abdominal abscess in a steer, Berger 
found that the wound extended to the rumen (see Zzfestinal Fistule). 
Some fistulz, not in communication with a mucous membrane, may be 
kept discharging by the presence of a second foreign body held in the 
tissues, or by a piece of the first. 
Foreign bodies which, after remaining some time in the tissues, give 
rise to a superficial abscess, require also that the abscess shall be punc- 
tured, and that they shall be extracted. 
Animate foreign bodies demand special treatment. The ticks of 
the dog are removed by the simple touch of a piece of cotton moist 
with benzine. Linguatulina are made loose by nasal douches of 
cresyl solutions, ammonia, or benzine; from the connective Bisstte of 
cattle and horses hypoderms are extracted by squeezing. The para- 
sites of the digestive canal are expelled by anthelminthics and purga- 
tives; those of the respiratory apparatus by fumigations of tar. 
Aseptic liquids gathered in cavities existing inside of tissues may be 
