C 404 ] 
which flopt the Aiding Piece B of Fig. 1. I 
thruft in this Piece, which opens the Staff, and 
makes the Elbow or Angle b , Fig. 2. I then fatten 
the Screw to fix the Staff thus open : I afterwards 
draw the Rings towards me, as if to draw back the 
Staff, always in a horizontal Pofition, till the Angie 
bda flops me. Then, being fure that the Elbow b 
of my Staff has pafs’d dire&ly between the Orifices 
of the Ureters-, and that it is a good Finger's Breadth 
from the Neck of the Bladder, I raife up the Handle 
of my Staff a little, carrying it foftly toward the right 
Thigh, and I give to the Rings an oblique Direction 
approaching to a diagonal, in order to pufh the 
Elbow b toward the Space between the Anus and 
left Os Ifchinm. An Afliftant holds the Staff in this 
Attitude ; another paffes the Fore-finger of his right 
Hand, or an Inftrument made for this Purpofe, 
Fig. 4.* into the Anus , and pufhes down the Retlum 
on the right Side. With my left Thumb I fecure 
the Integuments, retting it on the Middle of the 
Ferinreum'-, and with the right Hand I make, with 
the Incifion- Knife, Fig. 3. a long and deep Incifion 
between the Os lfchium and the Anus , beginning 
on one Side of the Place, where ends the Incifion 
with the greater Apparatus. This firft Incifion gene- 
rally 
* Tho’ this Inftrument ferves me here for removing the Reftum 
from the Parts deftin’d for the Incifion, it was not for this Ufe 
that I invented it, but to make a Speculum Am & Matricis^ being 
joined to another intirely like it, with its Angle and Groove placed 
on the Angle and Groove, A B } of this. We fhall have Occafion, 
in another Place, to give a more ample Defcription of this Inftru» 
ment, and its Advantages over the other Sorts of Speculum . 
