Minerals mixed Led. IL 
12. $. Talk will not flir in the leaft either with Spirit of Nitre, or 
Oy! of Vitriol. But the Lead-Spar maketh a confiderable Effervefeence with 
both of them feverally, Hence, however this be alfo called Exglifo Talk, 
yet there is no fmall difference betwixt this, and true Talk. 
13. 5. To thefe Stones may be added petrified bodies. As petrified wood s 
which (that upon which 1 made tryal) no acid ftirreth in the leaft. Petrified 
Shells's 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 con|picnows Bullition. Akte- 
ria, the Stone fò called, and found in fome places in England, with Oyl of 
Vitriol, maketh an Effervefeence at the Jame degree, So doth the Beleni- 
nites, or Thunder-Stone, both the larger and the leffer kinds. So that 
none of thefe are acid, or vitriolick, but alkalizate Stones. 
14. $. Coraline, mith Oyl of Vitriol, makes a confpicuows Bullition, 
yet wild and gentle; 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 rc- 
uires. 
a 15. $. Magiftery of Coral (prepared the ordinary way ) flirreth not 
in the leaft, either with Alkalies or Acids. Whence it is evident, That its 
ative Principles are in its preparation deftroyed and walhed away: 
that is to fay, It isan elaborate Medicine good for nothing. And thus 
far of Stones, 
16, $. I next come to Metals.and Ores. And firft for Leads upon which 
Spirit of Salt Spirit of Nitre,' or"Aqua fortis being dropped, it  firreth not 
in the leaft with any of them: but with Oyl of Sulphur, and efpecially with 
Oyl of Vitriol it maketh a flow Billition and froth. Hence it feemeth to be 
the moft alkalizate Metal. Which is alfo confirmed by a foregoing Ex- 
periment upon the Lead-Spar, which maketh a confiderable Effer- 
vefcence with any fort of acid, And which likewife, 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 foral Bullition with 
Oy! of Vitriol, with Spirit of Nitre a far greater. 
19. $. Mercury, with Oyl of Vitriol, will not ftir, nor with Oyl of Sul- 
phur. But with Spirit of Nitre prefently boyls up. Hence Mercury isa 
Jubacid Metal; Spirit of Nitre being a fubalkaline Acid. 
20. $. The filings of Iron or Steel, with Oyl of Vitriol, make a fair 
Bullition, like that of Minium. But Spirit of Nitre makes thems boil with 
much celerity. Hence Iron is likewife a fibacid Metal. 
21. $. Steel prepared with Sulphur maketh a far lefs Effervefience 
with the fame Spirit of Nitre, than do the filings. Fence there is a great 
difference in their ftrength. So that ten grains of thefilings 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 
bette: 
22. $. e is one Circumflance in the mixture of Steel and As me 
fortis, which is furprizing 3 and that is this, That firo fortis, 
dropped npon Steel, will not, of it felf, make the least Bullition : but if 
hereto 
