( 3 °° ) 
mix’d Beef-Tallow with an equal quantity of Sand » 
and having very well clos’d the Crucible, I expos’d 
the whole Mafs to a reverberatory Fire for two 
Hours, whereby the Sand became much blacker, and 
receiv’d a great deal of attraftive Virtue: but that 
•Sand became much more active which was burn’d 
two Hours with an equal quantity of Pitch, as likewife 
very black, fubtile, and very little (hining: but when 
it was expofed a longer Time in the fame Crucible, 
I obferv’d it to be weaker \ asalfo, when it was in 
the Crucible with the Pitch but j of an Hour, it 
fcarce acquir’d any Virtue y fo that there mull be a 
determin’d Aftion of Fire to raife the Vertue in the 
Sand. Yet I cou’d not raife a greater Virtue in the 
Sand than by the means following, viz, mixing the 
Sand in the Crucible with equal parts of Rofin, 
Pitch, Frankinfence, and Rape Oil, and expofing it 
to a reverberatory Fire for an Hour, having firft well 
clos’d up the Crucible. Between the black Coals of 
the oily Matter, therefticks a very black Sand , which 
leaps up fwiftly to the Loadftone, as foon as it is 
brought near it. Then I conlider’d whether the Sand 
did not acquire the greateft Force as it came nearer 
to the Nature of Steel, by burning it with the 
Bodies abovemention’d ; and fufpefting this, in order 
to try it, I put it among fuch Bodies as turn Iron into 
Steel, according to the Operations defcrib’d by that 
great Experimenter Monf .Reaumur, in that excel- 
lent Book, entitluled, The Art of turning Iron into 
Steel. I took therefore three parts of Sand, two 
parts of Chimney-Soot ; and of Sea-Salt, Powder’d 
Charcoal, and Allies, . one Part each. Having ac- 
curately 
