( 66 ) 
A Continmtion of the Difcoarfe eoncernmg Vitriol, begun in 
Numb. 1 03 ; Jbemng^ that Vitriol is ufually produced by Sul- 
jfhur^ a^ing on, and concoagulating with, a ^*Metal\ and 
then making out, that Allom likevpife the Refult of the [aid 
Sulphur \ as alfo evincing^ ^^4^ Vitnol,Su!phur,^;^rf AUom 
do agree in the Saline principle y and lajily declaring the Na- 
ture of - the Salt in Brimjlone^ and -whence it is derived^ 
THat the Vitriolat Salt in Common Sulphur differs little 
from the Salt in Vitriol, will appear evident to them, 
who will compare with the common Spirit or Oyl of Vitriol 
the Acidity of Sulphur afforded by Brimftone inflam'd under a 
Glafs-bell ; which being reftified is not to be diftinguifli't by 
any fenfible property from the well-reftiffed Acidity or Oyl 
of good Vitriol 5 and they rnayj am confident, be fafely fub- 
ftituted for each other, producing in Men and Metals the very 
fame effefts, being, in any apprehenfion, no lefs alike in their 
internal and (ecret , than in external fenfible quali- 
ties. 
The Quantity indeed of Acidity, which is obtain'd in the 
ordinary wayes of operation, is very fmall,a pound of Brim- 
ftone not yielding above o;^^ ounce or drachms ; the far 
greater part being by the rapid motion of the flame fublim'd 
in the form ^iflores ^ which differ not from the Common flow- 
ers. I have been often aflur'd by a kinfman of thatadmi- 
* rable Mechanift, Cornelius Drebbel^ that his Uncle did, by 
the means of conveniently fliaped veflrels,ordinarily obtain out 
of a pound of good Brimfton, eighty and in a very moifl fea- 
fon, /f/^ ounces of Acidity ; and was confident, f3ecouId,by 
improving the contrivance, recover the entire weight of the 
Sulphur; the moiftureof the Air acquired making abundant 
recompence for the avolation of what is Incoagulable. I 
have my felf, by the means of feveral Menfirua , reduced 
common' Erimjlone into the form o( din high]y Acid corrofive 
liquor ; and even Spirit of Niter ^ or Aqua fortis well refli- 
fied, being digefled on the flowers of Brimftone, then diftil- 
led in afhes, this repeated five or fix times, after the laft co- 
hobation 
