(i60 
^ded by divers accidents ; but then , indolence, and the 
exemption from fits of the Stone, and the clearnefs of the 
Urine, do prefently follow afcer the Operation. 
To all which our Author adds, That his proofs are 
more than convincing, when at the end of three days, 
upon founding, a Stone is found in fome, and none in 
others. 
And here he taks occafion to lliew the marks, where- 
by to difcern the Stones of Human bodies from Suppofi- 
titious ones: whichare, i.That the True ones have an u- 
niform colour without*, whereas he affirms to have feen 
one of this Gafcon^ that was on one fide white and full 
of little fliining bodies , the reft dark and tawny. 
2. The internal colour of the True ones is often various, 
but that of the bottom approaches to the outward co- 
lour. 3. The exterior furface is either finooth, or full 
of afperities. 4. The weight of the True ones is BOt 
alwayes proportionate to cheir bulk. 5. If jthey ht 
frefli i they fmell of the Spirit of Urine, and if in tkne 
that fmell abates, or is loft, it may be recovered, by ca- 
sing f )me pieces or powder of it upon a brick heated 
red. 6. Upon the True ones, efpecially if they be 
rough , there will be found fticking thin membraas , or 
fmall fibres, together with fome phlegH>e imd blood 
7. Their folidity doth often equal th^ of FUntjS, yef 
without ftriking fire, by what he could cv^ find.' 
S. They confift of feveral coates, or la^^ers, and in the 
center a kernel, ferving for a ground to all tlic incfi*- 
ftations ^ for, thefe Stones h?pvHig taken their beginnkig 
and firft body in the kidneys 5 they arc thence precipi- 
tated into the Bladder, ^heire tliey are tum'd to 
fro, and fo become incrUftated fet«*Rftime tOLtiiite:by ite 
flimy, fulphureous , fatin gfid mtai^eus fcditiiem oft^^^ 
W.ne. And thefe Stones of Bladder, fimh tm jh- 
thor^ being nothing but Tartar, ^Ea^TDh and S^tlfs, oeuien- 
ted 
