Of ROWELLING. sai 



the more neceflary, as it is too notorious 

 how impertinently they talk on this fub- 

 jc6l : for, in fliort, with them, a rowel is 

 to draw off all the bad and corrupt hu- 

 mours from the blood, by a fort of ma- 

 gick. , 



It is neceflary to obferve, that the mat- ^^^^ ^^* 

 ter generally difcharged by a rowel, is ^ ^'^^^' 

 nothing more than an ouzing from the 

 extremities of the vefTels divided in the 

 making of it •, in fa6l then, it is blood, 

 which lofes its colour, by being fhed ouc 

 of the vefTels, the warmth of the part, 

 and its confinement. 



If this is granted, it will evidently ap- The ufe 

 pear, that the good effeds enfuing this °^ ^°^^'^^^* 

 operation muft be owing to a gradual 

 depletionr, or emptying of the velTels in 

 general -, by which means the furchargc, 

 or load on a particular part, is taken ofF 

 and removed ; and impurities, or bad 

 juices (generally called humours) run off 

 with the good in proportion to their quan- 

 tity in the blood. 



To imagine f articular humours are Particular 

 thus feparately, and alone difcharged humours 

 from the blood, through thefe orifices, "?^ ^^^" 



• • 1 ^ 11 .J chareeu 



IS an opinion but too generally received, ^ ^^^, 



though 



