HE: A RT. 
renafeguences of mg difference are ast feen in the effeéts of 
a ligature. artery is tie , the two internal 
‘coats are raed a the cellular aiiae “alone fultains the 
effect of the ligature, which however is immediately applied 
toit. On expofing the tube, a fection, precifely like what 
: produced by a cutting inftrument, is feen cor- 
ding to the fituation of the thread. 
brittle of. any in the experiment performed 
on an inteftine, where the fibres, as in an arte 
lar, produces different effects; they are comprefled and 
bruifed, but not cut through. Arteries differ from mufcles 
in almoft ever 
in their developement and difeafes.”’ 
of the arteries in their natural tate 
although the fibres feem to give way eali 
and under the application rn 3 and thi 
-exerted both in 
The power of refiftance 
is. very confiderable, 
in ob warn 
» 
nes s action, ane 
sgreflve and con 
119 th- § 0z.; 
The carotid of a fal 40g 
; the {plenic artery o 
strength, compared to shat of Z 
Kiem power of refiftance in Ke arterial parietes is ieee 
‘to enable them to withftand the aétion of the heart, more 
- partic ularly when the contractility of that organ is unufually 
exerted: in this point of view, a relation mutt always fubfitt 
ge the power of the heart, and the ftrength of the 
arteries. 
— Sesto covering of the arteries is a diftinét and pecu- 
lar if animal economy ; its fibres alone could have 
ded to -. a of its being mufcular; but this property is 
common to it with ligaments and tendons, and ete 
cannot regulate the intimate nature of organs. 
of the varions re-agents on the arteries fhews mathe 
8 of ftrikin differe 
‘tion 
nees hetween their fibres and thofe of 
former remaini g 
“very little of ite thicker 
fons ‘einen. mo of 
Hantity of 
point ; in their organic and vital properties, | 
- .away the furrounding fubftanc 
.tatern 
of villous, nervous, or cutic 
fubftance in this fituation. We cannat fail to be ftruck 
with the drynefs of the arterial laming, as contrafted with 
the gp of mufcular fibres. When roles ins this 
have been macerated ; the di erence is very fl 
iad this Fier is cava to that in which wh ve fa 
been macerated ; we find alfo, that the arteries are almo' 
unaffected when the vifcera, in which they run, as the liver, 
fpleen, &c. are reduced into a foft mafs of putrefa dion. 
In the living flate alfo, thefe veffels refift difeafe much longer 
than the other foft parts: hence the arteries are often feen 
as it were diffeéted and infulated, when floughing has carried 
In the end, however, ma- 
ceration or Sei a4 to air a the texture of the arte- 
effect is produced much the moft rapidly by 
the latter swe d. As Ai former cafe me art is gradu- 
ally foftened, and after lofing the cohefion rs its fibres, is 
refolved into an apie apy and greyi p. Expofure 
a. 
5 
-to air renders the vellel at firlt of a pate anlpiit aad 
afterw bol ah reduces it to a pulp. 
has the following 
ebullition, —_ is juft the contrary of what we {ee in the 
mufcular m, under fimilar sironnanees. 2dly. There 
is a very m sotalead crifpation at the moment of ebullition ; 
but exerted more pra in the dirpetion of ae 
‘than in the axis of the veflel; the artery at the fame 
becomes barteri and the water gains a yellowifh tint. sea 
The part is a ees + but a greyifh tint fucceeds to. 
the yellow colour; the lofe ‘their cohefion to 
ratty Howeyer the ebullition 
tillue is never reduced into a 
break with great Aig 
may be prot 
otraéted, the arteri 
; gelatinots and yellowifh pulp, like the fibrous, cartilagipat, 
pemain in their original flate, with 
we pelssions ; having A loft their cor 
their colour. sthly. The broth pro- 
root y is in fipid. Concentrated acids firlt cor rugates then 
fofien, and a ce the arteries into Be ns -_ 
or rather into a ny — is yellow when the 
black when the P agaoaiete is smn ered Other jr sn a 
lefs fenfible efe&. he dilute lere 1s nO imme- 
diate gs as the confequence “gs immerfion: but the 
ea dually ‘ofteed and becomes brittle, as after 
in the cauflic flate, have very little 
ce on gry arteries 
aimee Mewsbrave + of the ow Syfem of red Blood.— 
Phi eae the pulmonary veins, the left.cavities of the heart, 
and the arteries: fn the latter” veflle it a Gimply the 
e, and has alfo been defcri the names 
cuticular. In eae to infulate this 
ranous lining in the arteries, the fibrous ftrata fhould 
be fucceffively an sae the laft of thefe aun but flight- 
brane, which may eafily be detached in the 
am others. Ehe fibres 
is” 
Sacto te 08 tee 
