C 4?9 
increas’d, and was quickly communicated to the outer 
Coat of the Artery likewife, which therefore Hough'd 
off as well as the other Integuments, and being at 
Length wore away, juft at the Extremity made a hid- 
den Aperture, about twice the Bignefs of a Goofe’s 
Quill. The Blood inftantly guflTd forth, as from a 
Stream or Torrent, and the poor Patient died in lefs 
than a Minute. 
Upon opening the Body, we began from the Heart, 
in which there was little remarkable, except that the 
left Ventricle was fomewhat larger, as were likewife the 
Column a earner , than they naturally flaould be. 
There was little obfervable likewife in the Aorta itfelf, 
till we came to the Curvature ; upon the upper Side of 
which was the Bajis of the TumouT, forming a cy* 
lindrical Stem of four Inches long while in the Cavity 
of the I borax-, but extending it felf into a circular 
Form'bf a larger Dimenfion, when it became external. 
Upon opening the under Part of the Aorta oppofite 
to this Bajis, and carrying the Incilion throughout its 
•whole Extent in the Thorax , the Trunk retain’d its ufual 
Form and Dimenfions, and was not at all dilated ; but 
in the upper Part above deferib’d, juft on this Side 
the Orifice of the right fubclavian Artery (which was 
nearer than ufual to the Orifice of the left Carotid ) 
there was a preternatural circular Aperture of half an 
Inch Diameter. Upon dividing this Aperture, and car- 
rying on the Incifion to the Apex of the Tumour, its 
whole infernal Subftance appear’d. The Edges of the 
Aperture at the Bafis of the Tumor were hard, and 
almoft cartilaginous, andfeemingly the Remains of thick 
and flefhy Fibres*, which upon a nicer Infpe&ion they 
appear’d to be in Faft, viz. the broken Fibres of the in- 
N n n ner. 
