STRONG YLUS ARMATUS. 
BTi 
wo coelic arteries, which have an independent origin ; so that 
t seldom happens that both are blocked at the same time, 
"he floating colon would be exempt from the danger of aneu- 
ismal embolism but for its first artery, which is derived from 
le great mesenteric; the other arteries arise from the small 
lesenteric, in which aneurism is rare* 
In cases of death from aneurisms, the alterations described 
hove are most frequently found. There may also be rup- 
jre of a verminous aneurism and abdominal hemorrhage, 
iut, as Freidberger and Frohner' have remarked, embolic 
alics may terminate in death in twelve to twenty-four hours, 
id before serious intestinal alterations have had time to oc- 
jr. The intestine is, in such cases, usually very distended 
y gas, and obstructed* 
Verminous aneurisms rarely give rise to characteristic 
miptoms, and their presence is often onlv recognized when 
lpture has taken place, which rapidly terminates in death 
om internal hemorrhage. On the occurrence of this acci- 
ent, which coincides ordinarily with a severe effort, the ani- 
al crouches or sits on its hind quarters, knuckles over at the 
dock joints, and falls as if struck with paraplegia; the pulse 
thready, limbs cold, visible mucous membranes blanched, 
c.; and, generally, the last moments of life are marked by 
^ns of profound and violent suffering. Aneurisms of the 
• >rta appear to be more liable to rupture than those of the 
feat mesenteric artery. As a rule, the blood flows into the 
aritoneal cavity, but sometimes rupture takes place directly 
do the intestinal canal. In eighteen cases collected by Bol¬ 
der, fifteen were of rupture into the abdominal cavity, and 
iree into the intestine. The latter result might be recog- 
ized sometimes from the presence of blood which impreg- 
1 tes the faeces passed before death. Rupture of verminous 
aeurisms is attributable to the feeble resistance of their walls 
which have lost their elasticity and contractility—and to 
te increased arterial pressure, resulting from diminution in 
ie lumen of the vessel. 
Besides the cases of rapid death, there have been noted — 
E symptoms of aneurism of the posterior aorta—decrease in 
