[ 55 2 ] 
.in which I boiled them. Thefe Explofions were 
owing not fo much to the included Air, 
which fome perhaps may imagine, as to the ful* 
phiueous Paits oi the Compofition expanding 
^nd flying o(t: For this boiled Lixivium had 
neither the green Colour, nor fetid fulphureous 
Smell and Tafte: at leaft in any degree like what it 
has when made of the fame Pot-afh by a Ample 
Infufion in warm Water. 
S>* I evaporated fome of the green Lixivium y 
made only by Infuflon, and filtred thro" a double 
Rag : As foon as it began to boil, a green Powder, 
to which its Colour is owing, fell to the Bottom, 
and the Lye became pale. After it was evaporated 
to a Pellicle, and fet in a cool Place, a Salt fepa- 
ratcd from it on the Sides of the Cup,, in angular 
Cryftals like Tartar. Thefe Cryftals were foon 
formed, and in pretty large Quantities, but were 
difficult to feparate from the alkaline Lye and Salt, 
in which and the open Air they were apt to dif- 
folve : But from the Pellicle I obtained fome Pieces 
of the fame Salt that would not diffolve in the open 
Air. 
io. Oil of Vitriol makes a ftrong EfFcrvefcence 
with this green Precipitate, with a white Fume, 
and a very ftrong fulphureous Smell. It does the fame 
with thefe white Cryftals, altho* the fulphureous 
Smell is not fo ftrong. But with the pure fixed Al- 
kali there was no fuch fulphureous Smell to be 
difeerned. 
From thefe Experiments we may determine fome- 
thing about the Nature and Contents of Pot-afh. 
This we are the better enabled to do, from the 
accurate 
