Afr. Macie’s Account of 
boiled In water, and dried by expofure for fome days to the air, 
was ftill of its former weight. 
§ VL This fubflance feemed in like manner to refill the 
aCiion of pure white nitrous acid boiled upon it. 
§ ViL (A) A bit of Tabafheer weighing 0.6 gr. was digefled 
in fome ftrong white vitriolic acid, which had been made per- 
fectly pure by diflillation. It did not feem by this treatment 
to fuffer any change, and after having been freed from all ad- 
hering vitriolic acid by boiling in water, it had not under- 
gone any alteration either in its weight or properties. The 
vitriolic acid afforded no precipitate on being faturated with 
foda. 
(B) Two grains of Tabafheer reduced to fine powder were 
made into a pafle with fome of this fame vitriolic acid, and 
this mixture was heated till nearly dry ; it was then digefled in 
diflilled water. This water, being filtered, tailed {lightly 
acid, did not produce the leafl turbidnefs with folution of foda, 
and fome of it, evaporated, left only a faint black flain on 
the glafs, produced doubtlefs by the aClion of the vitriolic acid 
on a little vegetable matter, which it had received either from 
the Tabafheer, or from the paper. The undiffolved matter 
collected, wafhed, and dried, weighed 1.9 gr. 
§ VIII. 2 gr. of Tabafheer, reduced to fine powder, were long 
digefled in a confiderable quantity of liquid acid of fugar. The 
tafte of the liquor was not altered ; and being faturated with a 
folution of cryftals of foda in diflilled water, it did not afford 
any precipitate. The Tabafheer having been freed from all 
adhering acid, by very careful ablution with diflilled water, 
and let dry in the air, was totally unchanged in its ap- 
pearance, and weighed i .98 gr. This Tabafheer being gra- 
2 dually 
