90 DISEASES OF THE HOG. 
healthy and neither animal seemed to be in any 
way affected by them. The loss of power of the 
hind parts of pigs which has been attributed to 
kidney worms, is not due to a parasite, but to par- 
alysis of the muscles of the hind parts. I have made 
careful investigations of such cases, but failed to 
find any worms or any disease of the kidneys. 
Paralysis of the hind parts would not be the symp- 
tom of kidney disease. 
TRICHINA SPIRALIS. 
TUT] 
WY 
Ee 
Zs 
Figure 76.—A small piece of human muscle containing 
encysted young of Trichina spiralis Owen, enlarged forty-five 
diameters. From Hearth and Home, after Leuckart. 
