I. Jn eafy Method of procuring the Volatile 
Acid o/Sulphur,^ Ephraim Rinhold Seehl$ 
addreffed in a Letter to the Prefident and 
Fellows of the Roial Society. 
of Sulphur was greatly wanting, I take the Liberty 
of laying fuch a Method before you, in order to 
its being difpofed of as ye {hall think proper. 
The Difficulties which attend the making of the 
Oleum Sulphur is per Campanam , even after the Im- 
provements of M. Homberg , are fo great, the Pro- 
cefs fo tedious, and the Produce fo moderate, that 
this Preparation is rarely to be met with in the Shops j 
but the Oil of Vitriol is commonly fold, and ufed, 
in its head. 
Nor, perhaps, if the true Oleum Sulphur is per 
Campanam could be obtained cheap, is this the Thing 
fo much wanted in Chymiftry, Pharmacy, and Phyfic, 
as the volatile Acid of Sulphur j containing not only 
the Oleum Sulphur is ^ as it is called, but, at the fame 
time, the pure native Gas , or highly volatile Spirit, 
of the Sulphur 5 which in our Method is preferved ; 
and which, we have Reafon to believe, confiderably 
increafes its Virtues, both as a Menflruum, and a 
Medicine. But of this, Gentlemen, ye are the pro* 
pereft Judges? who are too well acquainted with the 
Writings and Difcoveries of Mr. Boyle , Becher } Hom- 
Gentlemen , 
Read at a Meeting 
of the Royal Society, 
Jan. 19. 743-4. 
AVING found that a com- 
modious and cheap Method of 
obtaining the true volatile Acid 
A 
berg , 
