( 4 6 ) 
being laid in a heap, are covered with other elixed or drained 
Allies, the better to keep them warmjwhich is reiterated, as long 
as they make Brimftone. 
Tomak e Coper as or Vitriol , they take a quantity of the laid 
Allies, and throwing them into a fquare planked pit in the Earthy 
feme four foot deep, and eight foot fquare 5 they cover the 
fame with ordinary water, and let it lye twenty four hours, or 
until! an Egge will Iwim upon the liquor, which is align, that 
it is ftrong enough. When they will boyl this, they let it run 
through Pipes into the Kettles, adding to it half as much Mo- 
ther- water, which is that water, that remains after boyling of 
the hardned Coper as . The Kettles are made of Lead, 4 ± toot 
high, 6 foot long, and 5 foot broad, ftanding upon thick Iron 
Barrs or Grates. In thefe the Liquor is boyled with a ftrong 
Coal- fire, twenty four hours or more, according to the ftrength 
or weaknefs of the Lee or Water. When it is come to a juft 
confidence, the fire is taken away, and the boyled liquor dif- 
fered to cool fomewhat, 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 not un- 
like our Tan- pits) where it remains fourteen or fifteen dayes, 
or fo long til! the C&peras feparate it felf from the water, and be- 
comes icy and hard. The remaining water is the above-men- 
tioned Mother»water ; and the elixed or drained Allies are 
the Dreggs, or Caput mortuum , which the Lee, whereof the 
Vitriol is made, leaves behind it in the planked Pitts. 
' ' ’ '■ - . ’ , - ’ . \ '' • ' ' ( ■ ■■ ■. .. ' ' 
A further Account of Mr. BoyleV Experimen- 
tal Hiftory of Cold. 
In the firft Papers of thefe Fbilofopbical Tran[a8ions,iomepro- 
mife was made of a fuller account, to be given by the next, of the 
Experimental Hiftory of Celd^ compofed by the Honourable Mr. 
Robert Beyle h it being then fuppofed, that this Hiftory would have 
been altogether printed off at the time of publifhing the Second 
Papers 
