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 



