no ^ Treatise w 
foul and milky. The next five Ounces and two 
Drachms having a fharper Tafte, befides an alka- 
line Salt which they difcovered upon Trial, con- 
tained an Acid alfo, which they manifefted by turn- 
ing the blue Tin&ure of Turnfole to a reddifh 
Colour. The lafl eighteen Ounces, two Drachms 
and a Half became more and more acid, and at 
length gave a fiery Colour to the Tindture of Turn- 
fole *, yet all along difcovered an alkaline Salt, by 
precipitating the Solution of corrofive Sublimate. 
With thefe Liquors came over nine Ounces, fix 
Drachms and a Half of blackifh Oil of a thick Con- 
fidence like Syrup, and heavier than Water *, and 
four Drachms of thinner Oil, which was of a yel- 
low Colour and floated upon Water. The black 
Mafs remaining in the Retort weighed thirty three 
Ounces and feven Drachms ; fo that feven Ounces, 
fix Drachms and a Half were infenfibly loft in Dif- 
tillation. 
The black Subftance remaining behind, which 
we may call the Coal of Guaiacum, being calcined 
in an open Fire for twelve Hours, that is, till it 
had given over fmoking and was reduced to white 
Afhes, weighed two Ounces, fix Drachms and twelve 
Grains. From thefe Allies, by Lixiviation, was 
obtained a fixt Salt, which was not merely alka- 
line, but neutral ; for being put into the Solution of 
corrofive Sublimate, a white Powder fubfided to 
the Bottom. The Quantity of this Salt was one 
Drachm and fixty two Grains. Wherefore thirty 
two Ounces and fixty Grains went off in Fume. 
It is very remarkable, that in this Analyfis , not 
much more than half the Principles, of which Guai- 
acum is compofed, were drawn off -, and that the 
other Part of them, confiding of a thick Oil, and 
an aluminous or vitrioiick acid Salt, were fo con- 
denfated, that the ftrongeft Fire was unable to raife 
them 
