by thofe Trials I have made on the fame Subjeft. 
I could fuggeft many more Arguments and Experiments ; 
but thefe being fufficient, and, 1 think, indifToluble, I pro- 
ceed to confute the Pretenfions of JcidSdlts to an intere/l 
in this new production. Firfi^ What concerns T^r/^r, its 
Acidity is driven away in great quantity before it can be- 
come Alcalifate* and a Volatil Salt may , to -my know- 
ledge, be by divers methods feparated from it. Second" 
fyj as to Mter^ though that in Diftillation yields an Acid 
Spirit, yet it abounds alfo in Volatil Salt ; as I could de- 
monftratefrom the manner of its generation, and from irre- 
fragable Experiments. And befides, perhaps in the ope- 
ration of the Sulphur on the Acid Salt, fuppofing it fuch,^ 
there is a comminution of its parts, and thereby that made 
a Volatil Salt which was before Acid, only magnitude dif- 
criminating between them ; And that they are often thus 
produced by each other, I could fully and at large 
evince. 
Having difpatch*t this, I cannot but take notice, that 
lam credibly informed, that many perfons of no ordinary 
repute for their skill in Chymiftry, and other Arts fubfer- 
vient to Experimental Philofophy, have been pleas'd to 
cenfurein an unufual meafure of feverity an AflTertion, ac- 
cidentally dropt from my Pen, in a Difcourfe concerning 
the Vclatil Salts of Vegetables^ in T<iumb^ loi. of the Ph. 
tranjaitiom \ which although circumfcribed by a ParA- 
thejis^ and an alien to the main defign and fcope of my un- 
der-raking, yet was fo far from being thereby protefted, 
that it hath fuftain'd the brunt of many unkind reproaches, 
and been reprefented as a PoGtion without foundation in 
Reafon or Experience. I (hall not endeavour by an ela- 
borate Apology to vindicate my felf from that difgrace, 
whereunto a Charge of being Inconfiderate, lln-judicious, 
or ( which is ftill worfe ) Un-fincere, muft neceffarily cx- 
pofemej but (hall nakedly and fimply rehearfe, without 
flouriftes, 
