PARASITOLOGY. 131 



From this coagulum there may break loose at differ- 

 ent times, emboh which may produce more or less 

 serious results depending on the size of the embolus 

 and the location of the embolism. There will be 

 ischemia of that portion of the intestine to which the 

 vessel is disturbed, and paralysis of that portion of 

 the digestive tube. The secretions are suspended and 

 thrombi-embolic colic results. 



The ischemic portion, at first pale, now becomes 

 dark red, due to the passive congestion. The mucous 

 membrane appears swollen and hemorrhagic infarction 

 occurs. A serous exudate may be present and the 

 organ appears increased in size. This condition fa- 

 vors infection from the .bowel and more serious results 

 may follow. 



Thrombo-Embolic Colic. 



Fermentation of the ingesta of this now paralyzed 

 part of the digestive tube may take place. The horse 

 shows colicky pains, lies down and gets up frequently, 

 perspires first in spots later may be covered with per- 

 spiration. If rupture of the aneurism takes place 

 during the attack of colic the animal will be noted to 

 sit up on his haunches, knuckles over in its fetlocks. 

 There will be blanched or pale visible mucous mem- 

 branes. The extremities are cold. The pulse is weak 

 and thready. If the aneurism be located in the pos- 

 terior aorta this vessel is more likely to rupture be- 

 cause of the high blood pressure in it. 



Bollinger records fifteen ruptured aneurisms as hav- 

 ing taken place into the peritoneal sac and three into 

 the intestines. 



