ii2 ^ Treatise 
into an Effervefcence, rifes up in the Veflfel, and 
takes Flame. When the Deflagration is ended, a 
certain fungous, rare, light, lhining, and infipid 
Subftance remains, which is afterwards incapable 
of Alteration by any Means whatever. Now in 
both thefe Operations, the Oil and acid Salt are 
converted into an Earth, or an infipid, ponderous, 
and brittle Subftance *, whether it be, that thofe 
terreftrial Parts were pre-exifting in the Oil and 
Salt, or otherwife have been newly produced from 
the Oil and Salt in the Operation. 
We may conclude from this Analyfis , that the 
Wood of Guaiacum conflfts of an acid vitriolick 
Salt, an Oil and Earth, clofely combined together 
under the Form of a denfer kind of Refin,i fo as 
not to be feparated, but with the greateft Difficul- 
ty : And that it contains, befldes, a certain am- 
moniacal Salt, which being lefs intimately joined 
with the other Principles, gives up its volatile uri- 
nous Part in the Beginning of Diftillation. 
The Sap or whiter Wood, which encompafles 
the brown middle Part of Guaiacum, is much the 
lighter, and lefs fit for medicinal Purpofes, as is 
evident from its Analyfis . For five Pounds of this 
fappy Part, in Diftillation, afforded thirty one 
Ounces, two Drachms and eighteen Grains of 
Phlegm, both acid and urinous ; with fix Ounces, 
fixT)rachms and a Half of thick, and heavy Oil. 
The black Mafs remaining weighed twenty three 
Ounces, three Drachms and a Half •, and the Lofs 
of Parts, which evaporated into the Air, was eigh- 
teen Ounces, three Drachms and fifty four Grains. 
Wherefore, in this Subftance, the Principles are not 
fo clofely united as in the middle Part of the Wood ; 
for as much as in that, the Lofs in Diftillation was 
eight Ounces lefs. Laftly, the black Mafs that re- 
mained in the Retort, being perfectly calcined. 
