t 100 ] 
Tab. I. Fig. 4. 
Explanation of the Figure of the Gorget, which 
Mr. le Cat calls Gorgeret Urethro-ciftitome. 
A , A Ring, for palling the middle Finger of the 
right Hand, which grafps the Handle G. 
B } Another Ring which is Aid by the Fore-finger to- 
wards d y to pufh the Blade ab, out of the Groove EF , 
The Figure reprefents the Inflrument in the State 
in which it is at the very Inftant when the Incifion is 
made into the Neck of the Bladder. The fame 
Fore finger draws the Piece B back towards A , 
when the Operator intends to make the Blades 
return into the Groove F 5 where they lie hid, 
while he introduces the Inflrument from 2), as 
far as Ff into the Urethra. 
The Groove FE is clofed or covered from d to e , in 
order to fecure the Pieces a , by c } d, e y in Situation. 
The Pins, which bind the Hinges ay by mull not 
be in the Center of the Pieces, but as they are 
expreffed in the Figure ; where b is pretty near 
the outer Edge, and the other two**, ey on the op- 
pofite Side $ to the end that, when the Ring B is 
thruft forward, the Hinge b may bend, and iffue 
out of the Groove F, by making the Angle abc . 
IV; 
