Px\RASITOLOGY. 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. When examined 

 closely especially microscopically it will be noted that 

 they may contain blood coagulum and even pus. A 

 local eosinophil ia 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- 



