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ter Medicines in the world, than fome certain Preparations of Nitre, 
duly adminiftred. Whoever fhall think that any kihd of, acid, as Oyl 
of Sulphur, Oyl of Vitriol, Spirit of Salt, or the like, will have the fame 
effects, will find themfelves much deceived in their praétice, 
42. §.° Iconclude with Stones. And firft, Spirit of Nitre roped up- 
on a Stone of the Kidneys ov Bladder, produceth the very fame effet, as 
upon the Gravelin Urine. That is to Say, it wakes it boil and buff up, 
until at length it is perfectly diffolued into a foft Pulp; which neither Ovi 
of Sulphur, wor Oyl of Vitriol, nor spirit of Salt will dos mor Sive the leaft 
touch towards its diffolution. This confirms what I {aid before of the 
ufe of Nitre and Nitrons Spirits, if duly prepared and adminiftred, a- 
bove any other Acids, againft the breeding of the Stone. ‘ 
43. §. Pearls, with any Acid, make the like Effervefcence, as do Oy- 
fier-fhells. But Magistery of Pearls, as ufually prepared, Stirs not at all, 
with any Alkaly or Acid, So that as to the effec frequently intended by 
it, it is very infignificant as of that of Corals hath been {aid, 
44. §. Crabs Eyes, with any Acid, make an Effervefcence, almoft as 
quick as that of Oyfter-fhells. 
45. Crabs Eyes likewife calcined, make a ftronger Effervefnence, than 
when uncalcined. So that thefe, as well as Shells, contain a fixed 
Alkaly, 
as §. The Stones in Whitings heads make a Strong Effervefcence 
like that of Oyfter-fhells. 
47. §. Stone of humane Gall, Stirs not with Oyl of Vitriol. But with 
Spirit of Nitre maketh a little bullition juft upon wixing, and after a con- 
JSiderable time, alittle froth. Much lefs than what was obferved before of 
the Gall it felf. So that it eemeth to be generated of the Gall coagu- 
lated by fome Acid, which hath already refraéfed the Alkaly wherewith 
the Gall abounds. This confirms the ufe of thofe Medicizesin the Faun- 
dies, or any other bordering Diféaé, which deftroys thofe Acidities 
by which the Gall is curdled or coagulated, and fo rendred more 
difficulty feparable into the Guts. _- 
48. §. Since the firft publithing of thee Obfervations, Mr. Wiliane 
Maithews an Apothecary in Ledbury, {ent me part, as I take it, of a 
Storeach-ftone, as big as a Wallnut of the largeft Size, voided by a wo- 
man about 82 years of age, fometime after an Avtume Fever.’ It con- 
fifteth of the bite Strze, as the Bezoar Stone 3 and maketh fome Bullj- 
tion with Spirit of Nitre. 
49. §. Bexoar, neither the Weitern nor the Eaftern, doth ftir at all 
with Oy! of Vitriol, 
50. §. Western Bexoar, with Spirit of Nitre, makes a very little thin 
froth, and that's alls and that it doth very flomly. But Oriental Bexoar, 
with Spirit of Nitre, after fome time, maketh a very great Effervefcence, 
froth, elevation, noife, and  fleams (as if you poured Oyl of Vitriol upon Salt 
of Tartar ) till it be wholly diffolved by ihe affufed Spirit, and turned into 
aluoft a blood-red. Hence it may feem tobe no mean Remedy againtt 
fach fretting and venenate acids, as oftentimes in Fevers, and other Di- 
Jfiempers, lye about’ the stomach, and are thetice frequently tranflated 
to the Heart, Brain, Nerves, and other parts. The difference likewife 
betwixt the Weffern and the Eaftern Bezoar, is fo great, that in any 
cafe of danger, and where the Bezoar is relyed upon,it ig an unpardon- 
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