[28] 
during the Operation; for, when a large Stone is 
laid hold of, and the Forceps of courfe much diva- 
ricated, infomuch that the Extraction of the Stone 
is found to be impracticable with Safety, without a 
fccond Incifion on the Parrs upon the Stretch ; you 
then flide the Point of a narrow Knife on the 
Groove of the Forceps quite on into the Bladder, 
and it will divide the very Part which needs it moft; 
whilft the Reffum , on account of its flaccid State, 
will moft certainly efcape wounding. If the Wound 
is defired to be but little larger, the Forceps muft be 
but gently drawn forward when the Incifion is made ; 
but if, on the other hand, the Stone prove extremely 
large, th c<Forceps fhould be then drawn forwards 
with a Force fufficient to put the Bladder upon the 
Stretch ; and by this Management the Dilatation 
may be made as great or little as is required. 
As the common Knife is not fo- proper for this 
Purpofe on account of its Breadth, I have got one 
made of a more convenient Form, with a Gorget- 
Handle and Button-Point, as in the Bubonocele Knife. 
This Method, as it removes all Occafion for Vio- 
lence to the Bladder, will reduce the EffeCIs of the 
Operation nearly to thofe of a mere Incifion only, 
which might, as now, fometimes prove fiftulous, 
but I believe fcarcely ever mortal. 
I would not be underftood to mean that it fhould 
be ufed in common Cafes, and moderate fized 
Stones ; no ) Mr. Chefelden has fufficiently demon- 
ftrated to the World, by Experiment, the Inconve- 
nience of cutting beyond the Proftatc, when it can 
be avoided. I only fay this, that where a large Stone 
offers, and the Circumftances are fuch, that the 
Operator is under a Neceflity of tearing the Parts to 
Pieces, 
