298 purgation:. 



turpentine, defending the wound from the ex- 

 ternal air; if needful, two or three ounces 

 Peruvian bark, per day, may be given either by 

 drink or ball. The incifion for a rowel, (liould 

 be about three eighths of an inch long, and in 

 feparating the (kin from the flefli, the latter 

 ought not to be wounded or bruifed, the 

 leather mud be very thin, not fliff or hard, 

 nor fo large as forrherly in ufe ; the (hape and 

 fize of a crown piece is moft proper, having a 

 large round hole in the middle : cover the 

 rowel wdth lint or tow, dipped in digeftive 

 ointment, and after its introdu6lion, clofe the 

 orifice with a pledget of tow dipped in the 

 fame. If the operation fucceed, the fur- 

 rounding- parts foon fwell, and a plentiful dif- 

 charge of fimple humour enfues ; which, in two 

 or three days, will be changed into a thick 

 white pus or matter. The time is indefinite 

 for the continuance of the difcharge, but the 

 memory of the operator, if he be of the Vul- 

 canian kind, ought to be by all means re- 

 freflied, that he may extract the leather in 

 time, or he will be obliged to cut it out, and a 

 very uafightly induration or lump may re- 

 main. 



Setons. The utility of thefe, in the opi- 

 nion of Dr. Darwin, is very great, from the 

 confideration that they facilitate the difcharge 



of 



