78 DISEASES OF THE HOG. 
THE INTERNAL PARASITES OF THE PIG. 
_ The parasites of the pig are so intimately con- 
nected with those of the human being that there is 
no doubt but that in certain stages of their de- 
velopment nearly all the most dangerous kinds 
are derived, either directly or indirectly, from the 
hog to mankind, and in return man furnishes to 
the hog the eggs of several of their worst parasites. 
Some of these worms are kept in existence solely 
by reason of the peculiar relations existing be- 
tween man and the domestic animals. This is 
the case particularly in respect to the most com- 
mon, tape-worm, of men, derived respectively 
from the flesh of cattle and hogs when imperfectly 
cooked. Measly pork should be avoided as unfit 
for food unless thoroughly cooked, yet such pork 
has been eaten when it was badly infested with 
measles. It can be easily known by its spawn-like 
appearance. In this country a very large propor- 
tion of the hogs not only harbor this entozoon, but 
also the common lung-strongle. - 
GENERAL OBSERVATIONS. 
a 
Worms, sometimes on account of their move- 
ments and the interruption they offer to the con- 
tents of the bowels, and their other modes of irri- 
tation, very often cause uneasiness and pain. 
From sympathy there is very frequent sensation of 
itching at the anus and nose, producing a disposi- 
tion to scratch or rub the root of the tail and poke 
the nose into the ground. This is a very common 
