2SO ESSx\YS AND OBSERVATIONS' 



concretions ; the true aneurifms, however,, 

 ■when fmall, may be without them, as was 

 the cafe with the three upper ones of the 

 right, and with the fmall one fituated 

 high np in the left thigh of J. Parker. The 

 fmaller an aneurifni is, the more equally 

 its coats are diftended every way ; and 

 the more gradually it increafes to, and 

 diminiihes from its largeft tranfverfe di- 

 ameter, the lefs ape it will be to have po- 

 lypous concretions formed in it, as the 

 flream of blood through it is then freefl ;- 

 but the larger it is, and the more it 

 protrudes to one fide, in form of a pouch, 

 the lefs free will the flream of blood be 

 through it, and the more the blood will 

 be apt to flagnate, and to concrete. Thefe 

 were the reafons why there were poly- 

 pous concretions in that of the left ham 

 of John Parker, why they are found al^ 

 mod always in mixed and falfe aneu- 

 rifms, and why there were nqne in the 

 four mentioned above. 



Most aneurifms, when they com.e 

 to be large, and lie contiguous to bones, 

 render luch bones carious ; the fides of 



the 



