Foreign Vegetables. 113 
left one Ounce, three Drachms and forty fix Grains 
of vvhire Afhes from which were got, by a Lixi- 
viation, two Drachms and two Grains of fixt Salt, 
which was not purely alkaline, but neutral. The 
Bark of Guaiacum in like Manner, by a chymical 
Treatment, is found to be very different from the 
Wood, as well in its conftituent Principles, as in 
the Mixture of them : For five Pounds of the Bark 
yielded in Diflillation twenty four Ounces, one 
Drachm and thirty two Grains of Phlegm, both 
urinous and acid ; yet fo, that the firft Portions 
of it difcovered Marks of a weaker Acid, and 
feemed to be loaded with a much larger Quantity 
of alkaline urinous Salt, than the Liquor drawn 
from the Wood. Afterwards came over eight 
Ounces, three Drachms and forty four Grains of 
thick and heavy Oil ; a black Mafs, weighing twenty 
nine Ounces, four Drachms and fifty four Grains, 
remaining in the Bottom of the Retort. This, be- 
ing calcined for eleven Hours in a reverberatory 
Fire, left thirteen Ounces, fix Drachms and fixty 
Grains of white Afhes, which contained feven 
Ounces and twelve Grains of mere alkaline fixt 
Salt. 
From thefe Analyfcs it is evident, that in the 
Bark is a larger Quantity of alkaline Salt, both 
urinous and fixt, than in the Wood ; as alfo that 
it contains more of a fixt Earth or Allies, but lefs 
Oil and acid Sait. Befides, it appears that their 
acid Salts are of a different Nature •, fmce That in 
the Wood is formed into a fixt neutral Salt, and 
That in the Bark concretes into a Salt purely al- 
kaline. So that upon the whole we may conclude, 
that the Virtues of the Wood and the Bark are 
different, and ought not to be indifcrirninately 
made ufe of ^ which is confirmed by the Practice 
and Experience oi the belt Phyficians. 
Guaiacum 
