COMMON DISEASES OF SWINE 345 
Thorn-headed Worm.—This parasite is much less common 
than the round worm. It is usually found attached to the wall 
of the intestines by its hooked proboscis, from which it 
derives the name of “thorn-headed.” In length it is similar 
to the round worm, but its surface is somewhat wrinkled, and 
the posterior extremity is blunt. Though only a few are 
usually found in an animal, they do much more dainage than 
the round worm, irritating the lining of the intestine, and 
sometimes causing severe inflammation. It would be difficult 
to distinguish the symptoms from other intestinal derange- 
ments, but a post-mortem examination would readily reveal the 
presence of the worm. 
Pin-Worm.—The pin-worm is very small and might be 
casily overlooked in a careless post-mortem. It is usually 
found near the beginning of the large intestine, often hidden 
in the folds of the lining membrane. It is a very common 
parasite of swine, and does not seem to cause much incon- 
venience to the animal. : 
Whip-Worm.—This is also a small worm, being about one 
and one-half inches long. It attaches its head to the lining 
of the intestine, and is usually found in the beginning of the 
large intestine. The anterior portion is very thin and hair- 
like, and the posterior portion is thick and cylindrical in shape. 
Like the pin-worm, it does not seem to create much disturbance, 
but must be more or less injurious, 
Treatment for Intestinal Worms.—Preventive treatment 
consists in keeping buildings and surroundings clean and 
sanitary. Feeding in filthy yards and allowing to drink stag- 
nant water are practices which favor the spread of parasites. 
As to medicinal treatment, the writer has found that allow- 
ing hogs to have access to a mixture of charcoal and salt, or 
charcoal, wood ashes, and salt, seems to be quite effective in 
driving out round worms. 
