-40 ESSAYS AND OBSERVATIONS 



the large fac of the right ham, it is mod 

 probable that thefe two anearifms were 

 originally formed in the fame manner as 

 the others ; though the violent ftretching, 

 and the mixture of other fubftances with 

 the coats of the fac, confounded all the 

 parts fo much, as to make fuch a demon- 

 ftration impradicable. And we may pre- 

 fume, that fo many good anatomifhs, who 

 have given us hiftories of v^hat they call 

 true aneurifms, were not deceived in the 

 nature of the difeafe, although they have 

 not eefcribed minutely the texture of the 

 aneuriflnal facs, correfponding to that of 

 the arteriea in a natural found ilate. Pro- 

 bably the fliate to which the greater part 

 of true aneurifms have been reduced be- 

 fore they were examined, has contributed 

 to this inaccuracy of the obfervators.- 

 Mod of them, we have any account of, 

 had degenerated into the mixed kind ; 

 and the coats of the artery were either 

 blended with ofTeous, fleatomatous, puru- 

 lent, or other morbid matter; or they 

 were deftroyed by eroiion or ovcrftretch- 

 ing, or were incorporated or confounded 



. ' with 



