( l 01 ) 
curately mix’d all thefe Bodies together, they were 
expos’d for fix Hours in a clofe Crucible to a ftrong 
Fire; and then the whole Mafs was boil’d and waih’d 
in Water, then dried, and fo received a great deal of 
attrafting Force i but it was not near fo aftive as 
that which was prepar’d with Soap, or in the man- 
ner laft defcrib’d. 
And now, what can this Sand be? Is it an imper- 
fed Magnet, or fubtile Powder of it, which when it 
is grown up into a greater Lump, makes the vulgar 
Load Hones? So 1 conjectur'd at firft ; but when I found 
by Experience that common Loadftones expos’d to 
the Fire, according to fome of the Methods above- 
mention'd, did rather lofe of their Force than gain, 
I alter’d my Opinion ; and now confefs that I have 
not yet penetrated into the Knowledge of the Nature 
of this Matter. 
Whatever it be, it is certain that there are fevera 
kinds of this Sand , brought from different Countries 
of the Earth : For it is brought from PerJIa ; fome 
is brought from Virginia \ there is another fort in 
Italy, which is common enough at Leghorn , and 
this laft is naturally very attraftive ; there are two 
forts found in the Eber, a River of Haflia\ of 
which, one is like the Italian , and the other coniifts 
of large Grains, almoft as big as Hemp-Seed, but 
fcarce having any Virtue. I have befides a very 
ftrong Sort, which I am told was got near old Ragufa 
in Dalmatia. No Body knows how many kinds of 
this Sand there are: that Time, and the diligent 
Obfervations of Philofophers miift hereafter Ihew. 
I herewith fend you a little Box, containing one 
Paper with the natural Sand ; another, the Sand after 
R r x having 
