( 119^ ) 
D The Trunk of the Artery Opened dnd cxoonded; 
E £ The Perrifications of Oflifications in tlie fides of the 
Artery. 
F F Their fpcc ks in the lower part of the Artery, not fo 
large as in rhc upper part, and placed at greater diftances. 
a a The Branches arifing irom the Trunk of the Ar- 
tery. 
G, A Portion of the Trunk of the Artery of the Arm 
abQve-m ntion'd. 
H The fides of the Artery very mnch thickned, where- 
by the Diameter ot its Canalk was fo Diminifhed that the 
Probe 
-I, would nof pafs it. 
The Ojjip'catfom in the Coats of Artmes have been fre- 
quently Obfery'd^efpccially in their large Trunks wirhin the 
Cavities of thoTiforax and AhdometJi, but I don't remember the 
like has been taken notice of in the Limbs ^ or that fuch im- 
pediments in their Canals have been tound the Caufe of 
Mortifications ot particular parts, as in the Inftance above* 
mention 'd 5 tho I doubt not, but the like has often 
happened in Aged people, efpecially where we find the 
progrefs of the Qangreen not very fwift, and its beginning 
from no external Cmfe *^ the Confequences of which are 
commonly found Fatal. When the Arteries of one Leg 
(or of any otherLimb) are fo afFeded, we may well fufpeft 
the like in thofe of other parts 5 which probably happened 
in the InfVance I now mentioned 3 for tho no Gangreen 
came on the ftump, yet the other Foot and Toes began to 
Mortifie about 6 weeks atter the Amputation, as did the 
parts about the Hips, which were Compreft in Laying or 
Sitting, before he expir'd. 
F I G. 4. 
REprefents the Extremities of the Blood Velfels, as they 
appear while the Blood is pafling them in the Omen* 
turn of a live Dog, view'd with a Micro/cope. 
AATht 
