being laid in a heap, are covered with other eh'xed or drained 
Allies, the better to keep them warm^which is reiterated,as long 
as they make Brmjlone. 
TovrnkcCoperas or Vitriol, they take a quantity ofthefaid 
Afhes^and throwing them into a fquare planked pit in the Earth, 
fome four foot deep, and eight foot fquare, they cover the 
fame with ordinary water^ and let it lye twenty four hours, or 
untill an Egge will Iwim upon the liquor 5 which is a fign, that 
it is ftrong enough. When they will boyl this, they let it run 
through Pipes into the Kettles, adding to it half as nauch Mo- 
ther- water, which is that water, that remains after boyling of 
the hardned fo/?i?r<3!x. The Kettles are made of Lead, 4^ foot 
high, 6 foot long, and 9 foot broad, ftanding upon thick Iron 
Barrsor Grates. In thefe the Liquor is boyled with a ftrong 
Coal. fire, twenty four hours or more, according to the ftrength 
orweaknefs of the Lee or Water. When it is come to a juft 
co:]fiftence, the fire is taken away, and the boyled liquor fuf- 
fered to cool fomcwhat, and then it is tapp'd out of the faid 
Kettles, through holes beneath in the fides of them, and con- 
veyed through wooden Conduits into feveral Receptacles, 
three foot deep and four foot long (made and ranged hot un- 
like our Tan- pits) where it remains fourteen or fifteen dayes, 
or fo long til! the Ceperas feparate it felf from the water, and be- 
comes icy and hard. The remaining water is the above-men- 
tioned Mother»watcr ^ and the elixcd or drained Alhes are 
the DreggSj or Capvit mortuum^ which the Lee, whereof the 
Vitriol is made, leaves behind it in the planked Pitts. 
A further Account of Mr. BoyleV Exferimen- 
f^/Hiftory of Cold. 
In the firft Papers of thcfe Philofophical TranfaBiom Jomc pro- 
mife was made of 2ifuller account, to be given by the nextjof the 
Experimental Hiftory of Cold^ compofed by the Honourable Mr. 
Robert Boyle ^ it being then f«ppof€d,that this Hjjlory would have 
been altogether printed off at the time of publilhing the Second 
Papers 
