DISEASES OF THE HOG. 108 
gree and character. The inflammation very fre- 
quently begins at the nostrils, fauces or larynx and 
passes down the trachea into the bronchial 
tubes. 
Causes: Cold in some form is the usual cause 
and is most common in the fall. Young pigs which 
have to lie out at nights exposed to cold rains or 
those kept in cold, wet houses are very apt to take 
inflammation of some part of the respiratory pas- 
sages. Pigs should havea good, dry, warm place to. 
sleep in at night. It is said that an excess of ozone 
in the atmosphere may occasionally cause it as well 
as coryza and laryngitis; this may be true as we 
sometimes find a number of animals affected with 
bronchitis at the same time. 
Symptoms: There is a cough and usually some 
hoarseness with distressed breathing; the animal is 
restless, holding up its head as if it was suffering 
snuffing the air; there is fever indicated by dryness 
of the skin and fast pulse; the cough is at first dry 
and painful; as the disease advances the cough be- 
comes softer and after severe coughing there will 
be more or less mucus of a white frothy color com- 
ing from the mouth; the appetite is impaired ac- 
cording to the severity of the fever. The disease 
generally lasts from four to ten days; at that time 
if the appetite is improving, the skin becoming 
moist and the cough less frequent, the animal 
makes a rapid recovery. In bad cases the inflam- 
mation sinks deeper into the small bronchial bron- 
chi; the air enters with difficulty through the con- 
stricted tubes, causing great oppression and diffi- 
