[ 3°7 ] 
Weight in air. 
Large (lone 308 y 
Small (lone 42 3 5 
Both (lones 350 8 
in water. 
<>2 85- 
10 4 
102 9 
Spec, gravity. 
I> 43 1 
1.326 
1.415 
Queers. Is it not probable, that the generation of 
thefe (lones might originally have begun in the ure- 
thra, as the patient did not ever remember to have 
had the lead complaint in his loins, or in any part of 
his bladder ? Or is it more reafonable to fuppofe, 
that the (lones were fil'd of all formed in the kidney, 
or urinary bladder, from thence conveyed with the 
dream of urine, when very fmall, and lodged in the 
urethra, till they had arrived to thefe (izes ? 
Either of thefe fuppofitions to me appears reafon- 
able. 
However, as hypothefes of this kind are with dif- 
ficulty afeertained, and as a difeovery of the fadt, 
could it be determinately made, would prove of very 
little confequence to the improvement of the art of 
furgery, I think it quite unneceffary to dwell upon a 
part of this fubjedt, in which the benefit of mankind 
appears to be fo little concerned. 
Plate VIII. Pig. 1. reprefents the upper parts of 
the two dones, as they were found lying loofely to- 
gether in the urethra. The longed end, that is, the 
fmalled of thefe two dones, was fituated neared to 
the neck of the bladder, or orign of the urethra. It 
may be obferved, that, on the fuperior part of thefe 
dones, there are two long grooves or chanels, which 
were gradually formed by the dreams of urine, that 
were occafionally difcharged from the bladder. 
R r 2 
It 
