[ 29 ] 
Pieces, unlefs divided by ail Incifion, the latter is 
more fafe and eligible. 
The principal Advantages of this Contrivance are, 
i. That the Degree of Dilatation is in the Operator's 
Power, to the greatefl Exadtncfs : 2. That it will in- 
fallibly divide thofe Parts only which are upon the 
Stretch i and for this Reafon, 3. The Reffum, if it is 
empty, and confequently flaccid, muft certainly 
efcape wounding. Its great 1 Simplicity is another 
Circumftance much in its Favour $ .for it feems al- 
low'd on all Hands, the lefs an Operation is incum- 
ber’d with Inftruments the better. In common Cafes, 
where the Afliftance of this Method is not wanted, 
the Forceps is not the lead incommoded as to its ge- 
neral Ufe s but if the Stone prove large (which can 
never be certainly known till it is laid hold of), the 
Remedy is at hand. 
Plimouth, Jan. 6. 
1748-9. 
P. s. 
John Mudge, 
Thefe forceps and Knife are reprefented in Tab. 
I* 3> 4, f- 
Fig. 3. The Forceps , with the Knife, a £, applied 
to one of the Cheeks of it. c , the Button, bfg , 
the Handle. 
Fig. t 4. The Cheek of the Forceps with the Groove 
in it d e. 
Fig. y. The Knife. The Blade ab i the Button c ? 
made to fit, and Aide along the Groove de ; bfg 
the Handle ; cab the fharp Edgej chf the Back 
of the Knife, which muft have the fame Curve 
as the Back of the Cheek of the Forceps or Groove 
to which it is to be applied, as in Fig. 3. . 
C M. 
IX. 
