[ 6 3 
great Ufe ; and may defray the Expence of the 
whole Operation; being, perhaps, the beft Way 
of making the Tartarus vitriolatus perfectly 
pure and neutral for medicinal Purpofes; its 
expected Virtues greatly depending upon its 
being clean and neutral. 
VII. Our Method has alfo feveral Advantages over 
Dr. Stahl’s ; tho’ his indeed affords a volatile Acid. 
But then, (i.) His Method burns the Sulphur, and, 
confequently, cl e (troys its Texture, and throws off, 
or exhales, Part of the Spirit or Gas ; whereas ours 
gently diffolves the Sulphur, and only divides it, 
fo as to leave the Acid afterwards feparable by a 
Wronger or more ponderous Acid ; and no-way 
confumes or'deftroys the inflammable Part, as Burn- 
ing does. (2.) Our Method is more neat or ele- 
gant than his, and affords a larger Produce, at a 
cheaper Rate, and in greater Ferfedtion, both as 
a Medicine, and as a Menftruum leaving alfo the 
Tartarus vitriolatus cleaner, and fitter for Ufe a§, 
a Medicine. 
VIII. Perfons but little verfed in chymical Philofo* 
phy, and the Operations it makes ufe of, might be 
apt to fufpeft, that this Spirit of ours is not a 
pure Spirit, or Acid of Sulphur ; but mixed with 
the Oil of Vitriol, here ufed as the Medium to 
feparatc the Spirit from the Sulphur and fixed 
Alkali : But ye, Gentlemen, very well know it to 
be an univerfal Law, that an heavier or ftronger 
Acid, ufed in a fuitable Proportion, conftantly, 
in thefe Cafes, feparates a weaker, and leaves it 
free to rife by itfelf in Diftillation, as it remarka- 
bly does in the prefent Operation; where all the 
Oil 
