d a drop or two of Water, they prefently boil up with very 
The Caufe is obfeure ; yet it is well known, that 
Water it (elf will diffolve Iron: fo that it ‘appeas,"as well by this, as 
by fome other Experiments, that even in common Water, asmild as it 
is, there is fome kind of corrofive Principle. 
23. $. Antimony with Spirit of Nitre, and Aqua fortis feverally, 
maketh an Effervefeence 5 fomewhat lower than Iron. With Oil of Pr. 
triol the Bullition is fo final), as difficulty to be perceived with a Glaf. 
Hence it feemeth to be ofa very compounded nature; if Imay fo call 
it, a fubacid-alkaline Metal. 
24. $. Antimonium Diaphoreticum, with Spirit of Nitre and Oil 
of Vitriol feverally, makes a confiderable Effervefcence. Wherefore it is 
notan ufeleß Preparation ; as from the Calcination and Ablution ufed 
therein, fome have thought. 
25. $. Bezoardieum Minerale, (that upon which I made tryal) 
Stirreth not at all either with Alkalies or Acids. To which, let thofe 
who make ufe of it, have regard. 
26. $. Tin, with spirit of Nitre, makes fo hot and vehement an Ef- 
fervefcence, that it turns prefently, as it were, intoa Coal. It makes 
alfo a fair Bullition with Oyl of Vitriol. And a gentle one with Spirit 
of Salt. Wherefore, it hath fomething of the nature both of from, 
Lead, and Copper. 
27. $. The like remarkable cirtumftance is feen in the mixture of 
Aqua fortis with Tin, as with Iron. For Tin and Strong Aqua fortis 
of themfelves will not Stirs but add a few drops of water to them, and 
they boyl up with the greateft vchémency. 
28. $. Copper, with Spirit of Salt, and Oyl of Vitriol feverally, Stirs 
not at all. Spirit of Nitre, and Aqua fortis, both boil it u» vehemently, 
Neither Spirit of Harts-horn,nor Spirit of Salt Armoniac maketh any Bal- 
lition therewith. But both of them, by a gentle folution, that is, gently 
Separating its Sulphur from its Salts, turn it blue. Hence Copper hath 
a greater proportion of acid than amy of the forementioned Me- 
tals. 
29. $. Silver, neither with Spirit of Salt, nor Oyl of Vitriol makes any 
Bullition. With Spirit of Nitre it makes one, but tis foon over : and then 
continues to diffolve flowly into white Coagulations. It alfo maketh with 
Spirit of Harts-horn, or of Salt Armoniac, a full and deep blue. Hence 
there is a greater proportion of acid in Silver, than in Lrad, Mercury, 
Iron, Antimony, Tin, or Copper. 
30. $.. Litharge of Silver maketh the greate® Effervefcence with oyl 
of Vitriol. Yet fome with spirit of Nitre: And with spirit of Salt År- 
moniac maketh jome little huff or elevation. And being mixed with Spi- 
vit of Nitre and Spirit of Salt Armoniac both together, produceth a faint 
blue. Hence, although the far greater part of this Litharge be but 
Lead; yet, it (ems, it hath fome (mall mixture of Silver. But that 
of Gold {eemeth, for contrary reafons, not to have any Gold. 
31. $. Gold maketh no Efervefience with any fingle Salt I know of. 
But it is commonly diffolved with Aqua Regis, which is known to be an 
alkaline Liquor. Whence it feemeth, That'as Lead is the moft alka- 
lizate, fo Gold the moft acid of Metals, 
