[ 3 6 5 ] 
this fymptom of pulfation in falfe aneurifms will 
fometimes be accompanied with a difcoloration, or 
variegated appearance, of the integuments dependent 
upon the infinuation of the blood underneath them. 
But if the extravafation be confined under an apo- 
neurofis, or if the difeafe has been of fo long land- 
ing, as to admit of the thinner parts of the extrava- 
fated blood being abforbed, or by any other means 
difperfed, and the fibrous parts, which are left behind* 
fihould be accumulated in confiderable quantities, and 
acquire fo compadt and folid an appearance, as to re- 
ferable brown macerated leather in their colour and 
texture, which I have always obferved to be the cafe 
in old difeafes of this kind ; under thefe circumftances, 
the original fymptoms of pulfation on the fwelling, 
and a difcoloration of the integuments, for the moft 
part become imperceptible : for which reafons the 
true nature of the difeafe muff be attended with a 
degree of uncertainty. 
It muff be acknowleged by all thofe, whofe ex- 
perience has given them opportunities of examining 
into thefe difeafes, that the fymptoms of a pulfation, 
and a difcoloration of the teguments from extrava- 
fated blood, are not only very often wanting in old 
aneurifms, but in the mod recent ones : which 
proves the non-exiftenee of thefe fymptoms to be no 
certain charadferifties of tumors not being aneurifmal : 
and the reafon why this often happens may be readily 
explained, and conceived of, from demonstrating the 
very deep or low fituation of many arteries, that are 
known to be liable to thefe injuries ; fuch as the 
femoral arteries, the arteriez tibiales pojlica ?, the ar- 
teries perenea, and fome others. 
Notwith- 
