(6c) 
Whereas all other liquid Acids evaporate with Eafe; 
this on the contrary is fo fix’d, as to require a greater 
Heat for its Evaporation than that which keeps Lead 
in Fufion.; and the Phlogijtkh Part, notwithftanding 
its Lightnefs, is fo intimately and firmly conne&ed 
with the reft of its Principles, as tofuftain a Degree of 
Heat equal to that of red hot Iron, during which 
Heat the Salt fparkles and emits Flames very bright 
for a good while, which is very wonderful and agree- 
able to behold j and this Sparkling being over, it re- 
mains red hot in Fufion, and perfeftly tranfparent ; 
and by greater Heat may be vitrified, as will be Ihewn 
hereafter. 
I put the above-mentioned Liquamen into a Glafs 
Retort, which I fet in a Balneum Maria , and di- 
ililled it to a ftrong Infpiffation. It yielded only an 
infipid Phlegm, except that towards the laft it came 
over a little impregnated with the Acid, but not (harper 
upon the Tongue than as if it had been a Mixture 
of Vinegar half an Ounce with Water four Ounces. 
Then removing the Retort with the infpiftated 
Liquor into a Sand-Furnace, I increafed the Heat 
gradually, fo as to make the Sand and Retort tho- 
roughly red hot, ’till at laft the Bottom of the Retort 
was ready to melt ; I then left it’till next Day, when 
being perfefldy cold, I broke the Retort, and found 
a mod admirable white Salt at the Bottom, which 
was fo united with the Glafs as not to be feparated 
from itg and fome was fpread all over the Retort quite 
up to the Neck, and, as near as I could guefsby View, 
it feemed to be as much in Quantity, could I have 
taken it out to weigh it, as the original Phofphorus 
from whence it was produc’d : Its Tafte was very 
