Sect. VIIL 
BuRS^ MtrCOSiE OF THE HuMAN BoDY* 
37 
SECT. VIII. 
Comparison of the Structure of the'Eu'RSM with that of the 
PLEURiE* Pericardium, and PERiTONiEUM. 
W E may perhaps venture a ftep farther, and remark, that the pericardium, 
the pleurae, and the peritonae urn, have the adipofe fubftance connedted to them ; 
and that the fat in the doublings of thefe membranes feems to be collected for 
fpecial purpofcs ; as at the apex of the heart, in the omenta, and appendices 
pinguedinofe of the colon : But we do not find, as within the capfular liga- 
ments and burfe, that fimbriae or fringes, fuch as in the joints have been fup- 
pofed to be the ducts of glands, project from the membranes which cover the 
fat ; and fewer veflels conveying red blood are difperfed in the cellular fub- 
ftance between the fat and thefe membranes. Hence the liquor fecreted into 
the joints and burfae probably differs fomewhat from that poured into the ca- 
vities of the thorax and abdomen. 
There is, however, a confiderable refembiance of ftrufture. And, in farther 
proof of this, I found in one cafe of hy drocele of the vaginal coat of the tefti- 
cle, for which I attended an operation performed by Mr Alexander Wood, 
four fmall cartilaginous bodies within the vaginal coat; one of which adhered 
flightly to the epidydimis ; the other three feemed to be loofe, and floated in • 
the liquor, but perhaps were rubbed off from the inner fide of the fac (r) in 
time of the operation. ' 
t 
K, • Wounds 
( j ) See Tab. IX. fig. 19. 20. 21. 22. 23. 
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