PARASITOLOGY. 133 
blood and disturbance to the circulation, from edema 
of the lungs brought about by continuous compres- 
sion on the diaphragm by the distended bowels or 
from cerebral or pulmonary apoplexy induced by in- 
creased arterial tension due to pressure of the dis- 
tended abdominal viscera on the larger arteries, 
Bollinger records a case in which recovery had taken 
place and later the animal came to autopsy. He 
records as high as five or six obliterated arterioles and 
venules in a square centimeter. 
There is a possibility that the larger aneurisms in- 
terfere to some extent with the normal blood supply 
to the bowel and account at least in some cases, for 
chronic digestive troubles so frequently found among 
horses of all ages and environments. 
At least a part of the larger sclerostomes pass their 
larval stage in small tumors in the wall of the large in- 
testines and possibly in small fecal pellets. These tu- 
mors vary in size according to the age of the larva and 
may attain a size up to that of a hazelnut. These are 
readily observed at autopsy as they push out the mu- 
cosa as well as the serous suface. Wher: examined 
closely especially microscopically it will be noted that 
they may contain blood coagulum and even pus. A 
local eosinophilia may be observed as well as hypere- 
mia. The larva merging into the adult stage leaves 
the tumor to be found free in the intestinal contents 
at which time a small opening may be observed at the 
summit of the tumor. 
There is no doubt but that these blood sucking 
worms in the intestinal tract wound the mucous mem- 
