236 ON ANEURISM OF THE AORTA IN THE HORSE. 
seized with cramp in the near hind leg, and which lasted a 
quarter of an hour. Two months elapsed before she was con¬ 
sidered capable of work. She then w^ent one journey w^ell; 
but had not gone 100 paces on her second journey, w^hen she 
suddenly lost the use of all her limbs. She fell on her offside, 
uttering the most dreadful cries: her fore leg's w^ere in violent 
convulsive action,’ the swx^at running from her, and the pupils 
contracted and fixed. A copious bleeding soon calmed her. 
Her cries became only occasional. She raised herself on her 
fore legs : the hind ones w ere ])owerless, but acutely sensible. 
She.continued in this state twx days, when her cries again 
became continual, and she died. 
The stomach and intestines were in their natural state. The 
liver much enlarged and easily torn ; and the kidneys, likewise, 
enlarged and inflamed. The posterior aorta, at the root of the 
renal artery, was dilated to double its ordinaiy calibre, and a 
tumour, osseous above and cartilaginous below, communicated 
wdth the aorta by an aperture as large as a,nut, the edges of 
which were exceedingly thin. The aneurism terminated 
abruptly near the origin of the crural arteiy. The internal coat 
was ulcerated where the ossific process had taken place, and a 
fibrous clot completely filled the dilatation and the posterior 
divisions of the aorta, and extended even to the origin of the 
renal arteries. 
The membranes of the spinal canal were highly inflamed, 
particularly about the lumbar region. The chord itself was, 
in that part, not of its usual consistence, covered with little 
spots of blood, and surrounded by a bloody effusion. 
Aneurism existed in both these cases ; but I have considerable 
doubt whether the symptoms that occurred were attributable to 
that aneurism, or indicated its existence. I should be more 
inclined to ascribe them to the inflammation of the membranes 
of the spinal chord, and the spinal chord itself at the lumbar 
region. 
The next account of aneurism is given by M. Vatel, 
clinical professor at the veterinaiy school at Alfort. . 
A mare had been brought for quittor. The foot had been opened, 
and the caustic applied; and she was, a few days afterwards, 
brought out for a second operation, when she suddenly stag¬ 
gered and fell. The nostrils were dilated, she heavxd violeirtlv 
at the flanks, the limbs wxre strongly convulsed, and the eyes 
were retracted, yet rolled frightfully. 
The jugular was promptly opened, but she bled not. She 
was presently dead. • . 
The lungs and intestines were sound, but the pericardium 
