2^4 ESSAYS AND OBSERVATIONS 



firm; ia fome, approaching to a cardla- 

 ginous nature ; in many, covered with 

 bony incruftations ; in others, in a puru- 

 lent corrupted ftate *. They are not ge- 

 nerally of equal thicknefs throughout, 

 but for the moft part thicker, though 

 not much, than the fides of the aorta na- 

 turally are. In the cafe of John Parker, 

 the fides of the cyfls which remained 

 ^entire, were nearly of the natural thick- 

 nefs 



* An aneurifm of the aorta, at its cnrvatare, where 

 the coats were thick and cartilaginous : Lazar. River, 

 cent, 4. obf. ^4. The moft internal or tendinous coat 

 cartilaginous, and tending to bofie, the mufcular all rup- 

 tured or broke: Manget. Biblioth. Chirurg. p. 92. from 

 Mifcel. Curiof. dec. 3. an, 9. and 10. In an aneurifm 

 of the aorta, which terminated where that veflel ap- 

 proaches the vertebrae, there were a great many ulcers : 

 Halier Opufcul. Pathol, obf. 13. The fides of the 

 aorta, at the dilated part, appeared five or fix lines 

 thick, (/. e. about half an inch) ; in the artery itfelf 

 were many white, callous, Icaly bodies, which feemed 

 to be full of pus: Ibid, obferv. 19. 



The in fide of moft large aneurifms have been 

 found covered with lamellated polypous concretions of 

 blood, which many authors have either miftaken for 

 poats of the cyft, or at leaft have called them by th^t 

 paoie. 



