C 907] 
iy heat and Cold; or an Acidum and a Vrinofum,'] This 
the animadvertor fays, is contra rati onem-, for two con- 
- trarys, non pojpint immediate eundem effeilum producere^ 
He iays Jcidum Scvrt?iofum may perhaps be externall or 
chance caufes of heat, by promoting a ludden motion, 
and conflict in fome bodys, butmuftnotbe confounded 
with the matter, that is inflammable. Thus water, and 
oyls of Vitriol mixt together, produce a much greater 
heat, then if you fliould put into the oyl of Vitrio!,a quan- 
tity of Urinous fait: but 'tis plain, that in the water 
there is an Vrinofum. Thus if you pour water upon Calx 
Viva (^which is an Alkali, and has nothing to do with A- 
cidityjyou. will produce a great heat, yet we want here 
one of the two Principles of heat, vi^, the Acidum 
Mr. Kunhel thinks he has made it clear,that thefe two 
Principles were demonltrated very plainly: he to eluci- 
date the matter, gives us fome eSedi'^QiSpiritus Acidi 
fas for inllance Aquafortis^ and Vrinoji fas Spirltus V- 
rin^e it felf,) thefe two in conjundtion diflblve Gold, make 
Aurum Fulminans, produce heat, flame, and even light- 
ning. Asto the experiment of water, and oyl of Vitriol^ 
he anfwers, that tho' he Ihould fl:ill continue to deny, that 
water holds no Vrinofum, yet he muft allow it to he^ 
frigidumjV^hich yet afforded this warming efFeifli.As to the 
experiment of r^/:»: i^^V^, he will not allow it tobe with- 
out an Acidum. He would confirm his opinion, by an 
Inftanceof the great P/^o/^Z'/^ri^i', ("called in England th^ 
folid,) which he fays hath nothing either Oleaginous or 
Refinous, but holds Salia Acida & Vrinofa : and yet per-^> 
forms fo many Luminous effects. 
Dr. Voightm2ikts further fearch into the Letter, and 
obferves, that the Author gives the rcafon, why fpirit of 
Nitre, and fpirit of Wine, make fo great an Ebullition, 
but fpirit of Wine, and oyl of Vitriol none at all : r/;(v 
becaule Nitre is not fo pure ^.nAcid as Vitriol, for that 
reafon, they may fland the quieter, and without Altera- 
L 3 tion 
