[ 4° 6 3 
in the Bladder, one muft turn the moveable Piece b C 
Fig. 2. towards the left Side of the Bladder, by giving 
to the Rings of the Staff fuch an oblique Dire&ion, that 
they make an Angle of about Forty five Degrees with 
the horizontal Line. In this State I open the move- 
able Piece, and oblige it to make an Elbow exa&ly 
in the Place defired. Then I do my Operation, as 
above defcribed. 
The above defcribed Operation is the Refult of a 
great Number of Experiments made on dead Bodies ; 
in fome of which I had injedted the hypogaftric 
Artery. 
Thefe numerous Trials have conftantly convinced 
me, that my Staff is an Infirument with which one 
is as fure as polls ble, always to open the Body of the 
Bladder in the Place refolved on by the Operator. 
For if it happens, that a Bladder either too large or 
too fmall, or fome other Motive, obliges the Surgeon 
to make his Incifion farther from, or nearer to, the 
Neck of this Organ, he will fulfil that Intention, by 
more or lefs pufhing the Piece with the Slider B, 
and thereby caufing the moveable Piece bC to make 
a greater or ieffer Angle. 
From Trials on dead Bodies I palfcd to Operations 
on living Subje&s;and 5 having had fome Reafons to 
think, that the Incifion into the Body of the Bladder 
between and beyond the Ureters , was preferable to 
that which is praftifed above the left Vejicula\_femi - 
nails']. In Autumn 1741 , 1 cut three Patients in this 
Way ; viz. 
John Feter c D,efiriareft , whofe Stone could not 
be extracted whole. He loft much Blood during the 
Operation, and after it; and died the 17th Day. 
3 Fete? 
