270 ESSAYS AND OBSERVATIONS 



cretions, the artery has been found lying 

 in the bottom of the cyft with a fmall 

 hole in its fide *, which could not have 

 happened had the cyft been formed of 

 the proper coats of the artery. The cafe, 

 however, of the true aneurifm related a- 

 bove, wliich followed a wound of the 

 arm, and was under the care of Mr H^w-r 

 kins, fliews the pofUbility of true aneu- 

 rifms following fucli accidents. 



This kind of aneurifm may not only 

 proceed from external wounds, but likewife 

 may be occafioned by violent ftrainings and 

 efforts of the body rupturing particular 

 arteries ; or by pus, or other acrid mat- 

 ter, eroding or deftroying the tone of their 

 coats, as feems to have been the cafe in 

 that aneurifm of the aorta of which Dr 

 Pringle has given an account above. 



We 



* The artery was found in this ftace in all the cafes 

 of fuch aneurifins related in the Edinburgh Medical 

 Eflays, vol. 2. and 4. ; in the Memoirs of the Acade- 

 my of Surgery at Paris, vol. 2. ; in De Hacn Ratio. 

 Medend. part 4- capt. 2. ; in tvyo or three cales where | 

 was prefent at the operation; and in all the cafes i 

 have found related by the authors I have looked into. 



