STRONGYLIJS ARMATUS. 
393 
feelingly dangerous formation of gas (within the intestinal 
act) which in the herbivora is so abnormal, both quanita- 
vely and qualitatively. 
14. In embolism and thrombosis of the mesenteric arteries 
e symptoms during life are entirely identical with those 
Dserved in the so-called colic of horses, as has been de. 
rmined by numerous observations. The partial paralysis of 
e bowel, which is brought on by the embolism and throm- 
)sis of the mesenteric arteries, forms in great part the chief 
id leading feature of the series of symptoms known as the 
colic ” of horses. The palsy of the bowel which arises this 
ay may explain also the frequent ruptures of the digestive 
inal and the greater number of its changes in position. The 
Iter are specially favored by the structure of the abdominal 
scera in the horse. 
15. The old changes which one finds in the peripheral 
1 anches of the anterior mesenteric artery, in the form expired 
; d partly absorbed embolic and thrombolic processes (pig- 
lentation, arterial and venous thrombi), particularly in coll¬ 
ection with those arteries which are seats of the aneurism, 
ecisively prove that the large majority of colics resulting in 
icovery, so far as they do not depend upon known injuries, 
;e caused by paralysis of the bowel from embolism and 
trombosis. The sudden occurrence, course, and result of 
tese kinds of colics also testify to their embolic origin. 
16. The oedematous, inflammatory, and hemorrhagic pro- 
(sses that one often finds described as the cause of death in 
(lie, almost exclusively depend on thrombosis and embolism; 
( the mesenteric arteries, the cases forming about forty to 
f ty per cent, of all fatal colics. 
17. The rapid course in fatal colics, as well as the pre- 
pnderating symptoms of dyspnoea in cases of recovery, is 
f ally due to the abnormal development of gas in the alimen- 
ry canal. In addition to the diminution of the respiratory 
rface by the lofty position of the diaphragm, a direct poi- 
ning (carbonic acid and sulphuretted hydrogen), probably 
entributes to the intensity of the symptoms and the rapid 
urse by diffusion of the abnormally developed gas out of the 
:estinal canal into the blood. 
