HEMORRHAGE.’ 
the mouth of the artery, and within its fheath, and which 
I have diftinguifhed in the experiments by the name of the 
external coagulum, prefents the firft complete barrier to 
the effufion of blood. This coagulum, viewed externally, 
appears like a continuation of the artery, but on cutting 
open the artery, its termination can be diftinétly feen with 
og 
“his coagulum is diftin@ from the former, and 
I have called it the internal coagulum. 
excludes it from the external wound, which then goes on to 
up and heal in the ufual manner. 
ference only, that its orifice is generally more contracted, 
and the external coagulum i 
courfe from the heart.’’. Jones on the procefs employed by 
hature in fuppreffing the hemorrhage from divided and punc- 
tured arteries, &c. p. 53, et feq. 
With the exception of a few inftances, in which the flrong 
retraction and contraction of a divided or lacerated artery 
Prevent hemorrhage altogether, Dr. Jones alfo concludes, 
that a languid ftate of the circulation is neceflary for the 
accomplifhment of the natural means by which the bleeding 
18 topped. | 
time 
Contracts, till its canal, as far as the firft lateral branch, 1s 
ened the parts, is gradual AWAY si oid 
Ata itill later period, the ligamentous portion of the ar- 
tery is converted into a mere filament. ‘Thus, in the end, a 
complete annihilation of the vellel takes place up to the 
place where the firft lateral branch is given off. But, long 
before this final change is effected, the anaftomifing branches 
of both the upper and lower portion of the artery have 
become much larger, fo as to tranfmit the blood into the 
inferior part of the limb, as well as if the circulation through 
the arterial trunk had never been obftruted. According 
to Dr. Jones, the extent and formation of the internal 
yond fuch branch, fcarcely any internal coagulum 
formed, as there is hardly any {pace left for it between the 
effufed lymph and the lateral ramification, But when the 
divifion of an ry has taken place at fome diftance from a 
lateral branch, a long conical internal coagulum is then 
ormed, the bafe of which is fituated towards the extremity 
of the artery, generally adhering partially at its circumfer- 
ence to the infide of the ‘veffel, clofe to the coagulum of 
The internal coagulum of blood does not fill up the canal 
of the veflel, except where its bafe is fituated, nor is it any 
where elfe adherent. On .'e other hand, * the coagulum of 
lymph is principally char.ferized b ering almoft 
throughout its a extent to the internal furface of the 
rtery.’” 
Though the internal coagulum of blood at firft does not 
fill up the artery, except juft at its bafe, yet, when the 
veffel afterwards contraéts, the coagulum is clofely embraced 
ie: 
when form 
not adhere fufficiently to the infide of the veffel. 
ones inf 
and - 
whofe 
views of the fubject were either more or lefs erroneous, or 
too circumfcribe 
With regard Vi the natural means by which the hemor- 
rhage from punctured, or partially divided arteries is 
upprefled, Petit was.t who furnifhed accurate 
obfervations. Dr. Jon wever, added to the eluci- 
C8, ver, hi 
dation of this part of the fubjeét, as he has to that of the 
preceding. His experiments have confirmed, that the blood 
is effufed into the ceilular fubftance, between the artety and 
above and below the 
a 
w 
io 
8 
eS 
its fheath for fome diftance, both 
at when the 
woun art to two or three inches above it, and bei: 
fomewhat thicker or more prominent juit over the wouidel 
part than elfewhere. : , a eae 
The hemorrhage, which immediately follows the punéture 
fheath with blood, and con equently diftending the theath, 
alters the relative fituation of the punéture in the fheath to . 
that in the artery, fo that 8 are not exactly oppofite cach 
nels: other. 
