[ 84 * ] 
above the Os 'Pubis , and place the Finger and Thumb 
gently upon them j then give the Handle to an Af- 
fiftant, to keep it firm in that Pofition ; then, with the 
Knife in the Right Hand, make a Pun&ure at once 
into the Bladder, exactly in the Middle betwixt the 
Points ; but, for the more Security, fomewhat lower, 
nearer the Os Ptibis ; and, without drawing out the 
Knife, make a large Incifion downwards, inclining 
under the Arch of the Pubis , in proportion to the 
Bignefs of the Stone, taking care not to wound the 
Cartilage that joins the Bones together, when the 
Knife is withdrawn : The Bladder being thus fup- 
ported, the Stone may be extra&ed with the Fingers, 
or with a fmall Pair of Tenets, there being little 
Danger of breaking it in this Method. When the 
Operation is finifhed, raife the Handle of the Ca- 
theter^ and unbolt it j fhut it clofe and fix it fo; then 
withdraw the Catheter , and drefs the Patient. 
‘April 5- I 739* 
See Tab. VII. 
Fig. i. ‘The Catheter, as it is to be introduced into 
the Bladder , the Two Legs A and B being 
clofe d together. 
Fig. 2. The Catheter, it s Two Legs A, B, being open. 
C,D, The Tube. 
E, The Sliding- bolt. 
F, The Two Holes into which the Bolt is 
to be Jlid. 
G, The Ears fixt to the Tube C, D, which 
is all of one Piece with the Leg A. 
H, The Handle , which opens the Legs ; 
this Handle is all of one Piece with 
the 
