258 ESSAYS AND OBSERVATIQNS 



times it natural fize, from the heart to a 

 Httle below its curvature; about an inch 

 from the heart, in the right fide, a cyft 

 protruded from the aorta forwards, be- 

 tween two of the cartilages of the fter- 

 num ; upon prefling this tumour with the 

 finger towards the aorta, one felt as if 

 there was a hole in the fide of that vef- 

 fel at the root of th« tumour. Upon o- 

 pening it, its cavity communicated with 

 that of the aorta, and the membrane li- 

 ning its infide feemed to be continued 

 with the internal membrane of the aorta. 

 However, I own, this cafe was doubtful j 

 becaufe the blood, when it forms a cyft iii 

 the cellular membranes, after the fides of 

 an artery are burft, gives the internal 

 membrane lining the cyft the appearance 

 of being continued with the internal 

 membrane of the artery ; and this tu- 

 movir had appeared fbme weeks before 



death *. 



The 



• A cafe a good deal fimilar to this, but where the 

 fac protruded backwards, we have related by De Haen. 



Aa 



