PARASITOLOGY. 129 



animal becomes immunized to the injurious substances 

 thrown out, some of which is undoubtedly absorbed, 

 is an important q«estion to determine. 



Intestinal Strongylosis. 



I have noted the great activity shown by the wrig- 

 gling Triodontophorus and S. vulgare when the colon 

 is opened shortly after death of the host. These 

 worms often appear red to pink in color, are thus very 

 active, no doubt the most active bloodsuckers of all 

 the multitude of species of strongylus that may infest 

 the large intestines of the horse. I have known in- 

 festations with the smaller varieties in young horses 

 where a fatal hemorrhagic enteritis resulted. The 

 feces were blood stained and each discharge from the 

 bowel was loaded with the small worms. 



Thus it will be seen that the intestinal strongylosis 

 may result in diarrhea, emaciation, anemia, colic and 

 death. The treatment of the intestinal infestation 

 consists of two drams each of iron sulphate and tartar 

 emetic given on an empty stomach in small amount of 

 chop, once a day for a week. This is followed by a 

 brisk aloetic purge. This treatment should be repeat- 

 ed at the end of a week. The colon contents is so 

 massive and the distance from the mouth so great 

 that the desirable results are sometimes hard to attain. 



As stated before thrombi and aneurisms of the 

 aibdominal blood vessels, and especially the great 

 mesenteric artery, are common. I have found these 

 thrombi in young horses, the youngest being eleven 

 months old. In this case the thrombus had formed in 

 one of the large branches of the great mesenteric 

 artery about four inches from its origin. The vessel 



