PARASITOLOGY. 129 
animal becomes immunized to the injurious substances 
thrown out, some of which is undoubtedly absorbed, 
is an important question to determine. 2 
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. 
A's stated before thrombi and aneurisms of the 
abdominal 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 
