* 
394 
T. F. WINCHESTER. 
18. The variety of the anatomical derangements caused by 
embolism and thrombosis of the intestinal arteries is faithfully 
mirrored by the variety of the clinical symptoms and the dif¬ 
ferent degrees in the intensity and course of the colic, 
19. Amongst every 100 horses afflicted with internal dis¬ 
ease, 40 are ill with colic. Among any hundred deceased 
horses, 40 have perished with colic, and among 100 colic pa¬ 
tients, 87 recover and 13 die. The figures prove that neither 
amongst the epizootic nor sporadic diseases of horses is there 
occurs so frequently, or claims any¬ 
thing like so many victims. Like the frequency of the worm- 
aneurism, the amount of disease and mortality increases with 
advancing age. The etiology of the colic of horses finds in 
the thrombosis and embolism of the mesenteric arteries, with 
the consequent paralysis of the bowel, an all-sufficient expla¬ 
nation, whilst the causes of colic hitherto accepted were, for 
the most part, insufficient. 
20. In a great number of cases, the thrombus of the worm- 
aneurism is continued past the mouth of the anterior mesen¬ 
teric artery, into the lumen of the aorta, and, as such, is the 
exclusive cause of the embolisms of the pelvic and crural ar_ 
teries which bring about the intermittent hobblings (the 
author says “ intermitterenden hinken,” not “ hahnentritten,” 
the usual equivalent term for springhalt). Considering the 
excessive frequency of the thrombus being continued into the 
aorta, it becomes highly probable that a great part of the dis¬ 
eases and lameness of the posterior extremities (“ Huft und 
Kreuzlahme, unsichtbarer Spath, etc.,” which may be ren¬ 
dered “sciatic and hip or spinal lameness, obscure spavin, etc.,”) 
are due to occlusion of the arteries. 
21. Owing to the fibrous thickening of the connective 
tissue of the root of the anterior mesenteric round the 
aneurism, and to the considerable size of the latter, disturb¬ 
ances of the innervation of the intestine, (as well as) hind¬ 
rances to the passage of the chyle, and irregularities in the 
poital of man) chronic disturbances of digestion in horses. 
22. Considering the great losses and heavy social disad¬ 
vantages that are occasioned by the colic of horses to the 
