[ 5 *° ] 
been looked upon by many chemifls *, to be ex- 
adly of the fame nature as the fpirit of fea fait, 
only mixed with a little of the oleum fuccini; — 
though l'ome have imagined it to be an acid of the 
vitriolic kind. 
i If, When I firft mixed this acid with the foffil 
alkali, I began to believe that what Monf. Bourde- 
lin had alledged was true ; for the liquor tailed 
faltifh, like to a weak folution of fea fait in com- 
mon water, but I was foon convinced of my error; 
for on evaporating and cryltalliling, I had a fait 
very different in its nature and properties from that 
of lea fait, or of glauber fait, one of which falts it 
mult have been had the acid been the marine or 
the vitriolic. This agrees with what Dr. Stockar de 
Neufornlj;, has laid of this being a particular 
acid. 
* Macqner Teems to be thoroughly convinced of the acid of 
fuccinum, or amber, being the fame with that of fea fait ; for in 
mentioning the proofs which Monf. Bourdelin has brought of its 
being fo, he fays, “ C’eft ce point qui eft l’objet principal de 
“ memoire de Monf. Bourdelin ; Sc cette decouverte eft fans 
“ contredit une des plus belles, Sc en meine temps des plus d if— 
“ ficiles, qu’il y eut a faire fur ce Bitume.” See his Elemens de 
“ Chymie pratique, tom. ii. p.213. 
t Sea fait is a neutral fait made of the foflil alkali, and marine 
acid, or fpirit of fea fait j and glauber fait, of the fame alkali and 
the fpirit of vitriol. 
J In the year 1760, Dr. Jo. Geo. Stockar de Neuforn, in 
his inaugural DifTeriation de Succino, publifhed at Leyden the 
7th of July, 1760, proves by a number of experiments, that the 
add of fuccinum is neither that of vitriol nor of fea fait ; and 
he mentions two neutral falts made with this acid, the one with 
the common vegetable alkali, and the other with the volatile. 
He fays that the cryftals of the one, made with the vegetable 
alkali, are clear and pellucid, and of the fame figure as the 
The 
