[ ] 
kept only in a clofe drawer, in the fame tea-cups and 
fnial! balbn?, without any cover, as they were (hewn 
to the Society. 
I have not hitherto been able to learn in what par- 
ticular place of the inland part of Tripoli in Barbary 
this fait is tbund, nor how it is difpofed of in the bowels 
of the earth : but it fhouid fecni to run in thin veins, 
of about half an inch, ora little more thick, in a bed or 
i'ea fait ; for all of it that has Ihthei to been imported 
into this country is covered with fea fait on each fide. 
The one fide is always fmoother than the other, and' 
appears as if it had been the bafis on which it refted; 
the other, w’hich (hould feem to be the upper fide, 
is rougher, by the fhooting, of the crydals. I'he pieces, 
of the thin veins appear almoft as if the fait had been 
difToIvcd in water, and afterwards boiled up into thirr 
cryffallifed cakes, orrly that the cryflals are much 
fmall'er, and’difpofed in a manner that cannot eafily be 
imitated by art ; for when this fait is dillblvcd, and' 
evaporated to a pellicle, and left to cryftallife, it ahvays 
fhoots into cryflals refembling thofe of Glauber fait. 
Brown paper dipt into a folution of this fait, after. 
It is dry burns almoft as if it had been dipped in a 
folution of true nitre, as Dr. Heberden had ob- 
ferved of the fait got at the Pic of Tenerif; which 
iTews, that it contains more of an inflammable prin- 
ciple than the common vegetable alkali. 
There are great mines of fea fait in the country of 
Tripoli, the fait of which ihould feem to contain a- 
large proportion of this natron ; for, I am told, that alf 
the meat faltfcd with it acquired a red colour. 
This native alkaline fait having never beenTub- 
je^kd to the force of fire, is perfectly mild, and con- 
I " tains- 
