[ 5 Sl 1 
tion fomething fimilar to this, where two rough 
dones were extracted by me a few years ago from a 
young man’s bladder of 15 years of age, I cannot 
help fufpedting, that there may have been indances 
of one or more dones being left behind in the blad- 
der at the time of operating, merely from the opera- 
tor’s putting too great a confidence in this general 
rule. Which fufpicion I am led into from having 
known people, who have undergone the operation 
of cutting for the done, relapfe into the like difor- 
der in a fhort time after the healing of their wounds,, 
attended with fuch fymptoms, as have obliged them 
to fubmit to a ? fecond operation ; when the done, 
upon being extracted, has appeared of fo confide- 
rable a fize, as to make it fufpicious, that this done 
mud" probably have been of a much longer growth, 
than the fhort time betwixt the two operations could 
admit of. The maxim kid down to us by authors, 
of a fmooth. and polifhed done in the bladder being 
never there alone, but always accompanied with one 
or more dones of the fame kind, I know no excep- 
tion to. But if this phenomenon fhould ever occur, 
the dridt obfervance of that rule (delivered to us by 
judicious writers in furgery) of always fearching the 
bladder under the like appearances, on prefumption 
of one or more dones. being left behind, cannot be 
attended with any future mifchief to the patient, 
when carefully executed by the methods recom- 
mended. above, and undoubtedly fhould always be 
ftridtly attended to. The fmooth and polifhed ap- 
pearances of the furfaces of human calculi are uni- 
verfally fuppofed to arife from their rubbing one 
againd the other j which may with reafon be lup- 
poled 
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