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DISEASES OF THE HOG. 19 
symptom of worms. The bowels are sometimes 
constipated and at others relaxed with straining 
and mucous or blood discharges; the mucus which 
is passed may be in shreds, which are sometimes 
mistaken for fragments of half digested worms. 
They also interfere with digestion, both of the 
stomach and intestines, which is indicated by un- 
digested food in the feces. The appetite is very 
variable it may be natural in some cases and in 
others deficient, depraved or craving usually the 
animal has a ravenous appetite, eating material 
which it would not touch in health. Bleeding 
from the nose, cough and swelling of the lips are 
also symptoms. The effects of worms frequently 
extend beyond the alimentary canal. Among the 
most common of these affections are derangement 
of the nervous system, such as vertigo, chorea and 
fits, obstinate cough, swelling of glottis, dyspnea 
and palpitation. They also cause some fever and 
loss of flesh and several skin diseases. It is diffi- 
' cult to diagnose a case of worms, as the above 
symptoms may be caused from indigestion. A 
new means of detecting them is by the microscope; 
even if there are no fragments of the worms pres- 
ent in the feces their eggs can be detected. Sus- 
pected cases ought to be examined by the micro- 
scope, and if the examiner is acquainted with the 
character of the ova this will decide the case. 
Causes of worms: There has been a great contro- 
versy on this subject, but no doubt the parasites 
obey the general law of nature in their develop- 
ment and growth. It is probable that the ova 
