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Minerals mixed Led. IL 

12. §. Talk will not ftir iz the leaft either with Spirit of Nitre, or 
Oy! of Vitriol. But the Lead-Spar maketh a confiderable Efferve/cence with 
both of them feverally. Hence, however this be alfo called Exglifh Talk, 
yet there is no fmall difference betwixt this, and true Talk, 
13. §. To thefe Stones may be added petrified bodies. As petrified wood s 
which (that upon which I made tryal) no acid [irreth in the leaft, Petrified 
Shells 5 upon four or five feveral forts whereof, Oyl of Vitriol being poured, 
produceth a great Effervefcence. The Root or rougher part of the Stone called 
Gloflopetra, with Spirit of Nitre, makes a confpicuows Bullition. A{te- 
ria, the Stone fo called, and found in fome places in England, with Oyl of 
Vitriol, maketh an Effervefcence at the fame degree, So doth the Belem- 
nites, or Tbunder-Stone, both the larger and the lefer kids. So that 
none of thefe are acid, or zitriolick, but alkalizate Stones. 
14. §. Coraline, with Oyl of Vitriol, makes a confpicuous Bullition, 
yet mild and gentle 5 that is, with very little, if any heat, and without 
any vifible Fumes. And red and white coral do the like. Hence they 
are all of a very gentle operation, and fit for Children, as the cafe ré- 
uires. 
‘ 15. §. Magiffery of Coral (prepared the ordinary way) fiirreth not 
in the leaft, ether with Alhalies or Acids. Whence it is evident, That its 
ative Principles are in its preparation deftroyed and wathed away : 
that is to fay, It is an elaborate Medicine good for nothing. And thus 
far of Stones, 
16, §. I xext come to Metals and Ores. And firft for Leads upon which 
Spirit of Salt Spirit of Nitre, or Aqua fortis being dropped, it flirreth not 
in the leaft with any of them: but with oyl of Sulphur, and efpecially with 
Oyl of Vitriol it maketh a flow Bullition and roth. Hence it {eemeth to be 
the moft alkalizate Metal. Which isalfo confirmed by a foregoing Ex- 
periment upon the Lead-Sper, which maketh a confiderable Effer- 
vefcence with any fort of acid. And which lilewife, being calcined, 
yieldeth a good quantity of Lixivial Salt. 
17. §. Lead-Ore stirreth not at all with Aqua fortis or Oil of Vitri- 
- ol. But Spirit of salt makes it bubble,and Spirit of Nitre makes it boil, 
Hence there is a confiderable difference betwixt the perfec& Metal and 
the Ore. 
18. §. Burnt Lead and red Lead, make avery faall Bullition with 
Oyl of Vitriol, with Spirit of Nitre a far greater. 
19. §. Mercury, with Oy! of Vitriol, will not Stir, nor with Oyl of Sul- 
phur, But with Spirit of Nutre prefertly boyls up. Hence Mercury isa 
fubacid Metal; Spirit of Nitre being a fubalkaline Acid. 
20. §. The pee Iron or Steel, with Oyl of Vitviol, make a fair 
Bullition, like that of Minium. But Spirit of Nitre makes them boil with 
much celerity. Hence Iron is likewife a fubacid metal. 
21. §. Steel prepared with Sulphur maketh a far lefs Effervefcence 
with the fame Spirit of Nitre, than do the filings. Hence there is a great 
difference in their ftrength. So that ten grains of the filings unprepared, 
will go asfar as fifteen grains or more of thofe which are prepared, 
as above-faid, Yet in fome cafes the weaker and milder may be the 
better. 
22. §. There is one Circumftance in the mixture of Steel and Aqua 
fortis, which is firprizing 5 and that is this, That flrong Aqua fortis, 
dropped upon Steel, will not, of at felf, make-the least pullition : but ah 
hereto 

