[ 395 3 
the Staff, that anfwers to the Body of the Bladder, is 
plunged very deep towards the Relvis, and alfo very apt 
to flip; for which Reafon Lithotomies, fuch as the 
celebrated Mr. Chefielden , who refolved to try this 
Manner of Cutting, have been obliged to injed [the 
Cavity of] the Bladder, that its Body might be the 
lefs fubjed to flip [from the Knife]; but made no 
Ufe of the Groove of the Staff, as deeming it ufe- 
lefs. Incifionem in fulco catheter is fieri non pofife , 
five necejfie non efife , ut fieftio in fulco fiat. 'Douglas 
in Heifier on the lateral Operation. But Mr. Ran 
made ufe of the Groove; therefore he did not make 
his Opening into the Bladder thro’ its Body. 
Secondly, This Lithotomift did not injed the Blad- 
der ; and yet his Operation was quick and fafe : 
Wherefore, it cannot be that he cut into thefBody of 
the Bladder. For, even with the new Staff of my 
Invention, which I fhall by-and-by deferibe, and 
which makes a confiderable Elbow forward, the In- 
cifion into the Body of the B adder is tedious and 
difficult. And I can affine you, from Experience, 
that this fame Incifion with the common Staff is fo 
difficult, that it comes near to an Impoffibility ; and 
that it is abfolutely impoffible to be always fure of 
making this Incifion in one certain Place, and with- 
out fatal Miftakes, in this Method, even fuppofing 
the Bladder injeded. Therefore Mr. Ran, who did 
not injed if, would have, a fortiori , performed an 
impoffible Operation, and with Succefs too : There- 
fore this Surgeon did not cut into the Body of the 
Bladder. 
Thirdly, 
