132 PARASITOLOGY. 
Additional symptoms noted may be those of look- 
ing around at the side, pinched facial expression, pass- 
ing a few hard fecal pellets later a total suppression 
of passages. The animal trembles and moves its hind 
feet uneasily. 
Large verminous aneurisms may cause frequent at- 
tacks of. colic. These are usually brought about by 
embolism in the small branches of the diseased artery. 
If the collateral circulation takes care of the part the 
animal recovers. If slightly more severe the disease 
may run a chronic course, indigestion and possibly 
constipation alternated with diarrhea, light colicy at- 
tacks, some elevation of temperature, capricious appe- 
tite. This condition may finally terminate in recovery 
or if still more serious marasmus, cachexia and death. 
An embolism in one of the smaller vessels may not 
prove fatal on account of the free arterial anastomosis. 
It is where more than one vessel is in a state of em- 
bolism or larger vessels affected that fatal thrombo- 
embolic colic results. As an illustration, if an embolus 
should lodge at the trunk of the large faciculus of the 
great mesenteric artery it would shut off the blood 
supply to the cecum and death of that viscus results, 
Or if the embolus should lodge in the first branch of 
the great mesenteric artery which goes to the floating 
colon serious results would follow. 
The direct cause of death in these cases is probably 
due to intoxication by absorption of toxic substances 
from the intestines, from infection of the infarcted 
area, from cardiac syncope as a result of pain, from 
absorption of poisonous gases from the bowel, from 
nervous shock due to the pain, from alteration of 
