( tfv T 
{harp and faline but notwithftandingits great Fixi- 
ty in haying endur’d a melting Heat for feveral 
Hours, it relented agaip in a moift Air, and in a few 
Days was entirely refolvcd into a Llquamen. 
The Phgfphorus , after its Deflagration,, leaves an 
almoft fix’d red Earth, or Caput mortuv.m y behind 
it, as is mention’d in Dr. Frobenius’s Experiment. 
Although one would have imagin'd that all the in- 
flamable Parts of the Phofphoms had been burnt off 
in the firft Deflagration, which feemed very violent, 
yet this red Earth retains fo much of an unHious 
PhlogiJFtc , that being placed over a red hot Fire, it 
fwells up, and keeps in Fufion a great while, emit- 
ting Flames and Flalhes of Light, fo long as it is 
kept upon the Fire; but when cold again, if expo- 
fed to a moift Air, it relents and refolves as the 
Flowers do: For the acid Salt of the Urine adneres- 
fo ftrongly to if, that although it undergoes feveral 
ftrong Ignitions, it will relent again as often, when fee 
in the Air. 
I took feme of the white Salt that ftuck to the 
Retort, and in order to try the utmoft Degree of its 
Fixity, I put feme of it into a Crucible, and gave 
it a vitrifying Heat,, in which it remained feme 
Hours, but was not yet run to Glafs, appearing only, 
like a fix’d white Earth as hard as Stone, and (hining 
as if it was juft ready to vitrify ; yet it was fo far 
fix’d, as not to relent any more in the Air ; had no 
faline Tafte,. nor was diflolvible in Water. I there- 
fore took another Portion of the fame Salt of Phof- 
phorus,. which I kept a longer time in the vitrifying 
Heat, and I.found it at laft run into perfeft Glafs. 
