( I a 84 ) 
Slewing me the fame, I was defirous to fee what it was 
made of, and had it cut for that purpofe, and found it of a 
hairy or fibrons fiiblance,layer upon layer,orcoat upon coat, 
over a Plumb- ftone.This Ball with its Plumb^ftone andfeve- 
ral Coats, my very good Friend Dr Leigh was pleafcd to give 
ine, and it is now in my pofleffion, and feems to be of the 
fame fubfta nee with that mentioned by Mr T0f7g€. 
The (econd inftancc I fa Vv of tliefe Balls was by the means of 
Dr Wm C<?/c',who did me th€ favour to (liew me a Letter he had 
from the Country, and fome fmaller Balls than the 2 before 
mentioned, which had in their centersPlumb-ftones.Theperfon 
he wasconfulted for, had, I think, the Colick to a great de- 
grec^and had voided feveral of them, they were not foSphse- 
Hcal, but of a comprefs'd figure, fmooth on the outfide and 
glaz'd as fome of the Tofhi Bovini are 5 and feemed within of 
the fame fubftance with the ioxm^r firAtttrnfuperJlrattimu^on 
2L Plumb-ftone. 
A third inftance like thefe I faw, through the favour ot 
the late Dr Wm^ Stokeham^ vvho (hewed me a Ball about the 
largenefs of that I had of Dr Leigh^ which had been voided 
by a perfon after great Sicknefs, and preferved by the Pa- ^ 
tients Phyfician, who was one famous for praftifingChy- 
mically fome years ago, viz'> Dr George Thompfon> He has 
wrote a large account of thiscafe, and printed it in his expert- 
menta <idmiranda,^,6j . de Lithocolo^ I had thislaft Ball in my 
poffeflion fome time, and in appearance it was of the fame 
fuMance, but what was contained in it I could not tell, not 
being permitted to open it, but that Author tells us it had 
fgveral Piumb and Cherry- (tones in it. Thefe Balls feem to 
be lorm'd fomething after the manner of Bezoars^ which 
generally have fome feed for their Center or w/r/i?/^/, on 
•which Coatsof another (libftanceare gathered. 
Thefe inftanccs are fufEcient tofhew the folly of that 
Gominon opinioci^that the Stones of Fruit are wholefomejfor 
tho by Nature the Cuts arefo defended by the Mucus I»tiJU 
ndh^ that very feldom People fujfFcr, yet if we con(ider the 
¥ariou§.circumvolutions of the Guts, their valves and cells, v 
and 
