PHYSICAL AND LITERARY. 241 



with the neighbouring cellular fubftance, 

 and membranes, or aponeurofis that lay- 

 above the artery, as was the cafe with the 

 one in the right ham of the firft hiftory 

 I mentioned, long before the tumour 

 burft externally, or otherwife put an 

 end to the patient's life. 



All the cavities of the human body 

 are capable of being diftended, and the 

 veflels of being dilated. The veins are 

 often obferved to become varicous, and 

 the arteries, on fome occafions, to fwell in- 

 to aneurifmal facs. The greater part of 

 the true aneurifms, we have any account 

 of, came of themfelves, and no caufe 

 could be afligned for their origin. Strain* 

 ings of the body, an increafed moment 

 turn of the blood, and a flop put to its 

 free circulation through fome of the large 

 vefTels, has beefi alledged to give rife to 

 feverals : However, this can only happen 

 where fome particular vefTel has been o- 

 verftrained, and {o much weakened as 

 not to be' able to refift the force of the 

 circulating blood j or, where there has 



Vol. in. J-ih beea 



