rtS 1 "] 
-with water, on parcels of the fame fand, without 
being able to difcover any conflict. 
* I poured Angle aqua fortis upon another parcel of 
it, without being able to perceive any ebullition worth 
noting. 
I uied alfo double aqua fortis upon another parcel of 
it, which, for ought I could difcover, had no more 
effect on it than the former. 
Tpoured fome aqua regia on a parcel of it, without 
difcovering any fen Able effed. I poured good oil of 
vitriol upon. another parcel of this fand ; but feeing no 
bubbles thereby produced, I weakened the oil with 
water, but without any vifible efFed. 
I repeated all the former experiments with the 
menftruums upon this fand after calcination per le in 
a crucible, but could fcarce obferve a bubble pro- 
duced by any of them. 
I poured fome of each of the liquors upon parcels 
of the powder of this fand calcined, without any 
fuccefs. 
Note, that I made thefe experiments both in the 
cold, and upon a fand furnace. So that to me there 
feems to be but little wanting to difcover any metal 
known to us, if it contained any fuch : for there is 
•no metal nor ore that fome of thefe menftruums will 
not work on, 
I powdered a fragment of a toad'ftone, and poured 
fome of thefe menftruums upon it, without being 
able to And that they in the leaft preyed upon it, any 
more than they did upon the fand. 
I poured fome of the aforementioned menftruums 
upon ordinary fand taken out of a fand furnace, where 
it muft have fuffered fome calcination 3 but could 
H 2 
