588 Mr. Macie’s Account, &c. 
' 
and tinged the flux green. With foda it effervefced, and 
formed a round bead of opaque black glafs. 
Thefe two beads, digefted in fome perfectly pure and white 
marine acid, only partially diffolved, and tinged this menftruum 
of a greenifh yellow colour; and from this folution Pruffite 
of tartar, fo pure as not, under many hours, to produce a blue 
colour with the above pure marine acid, inftantly threw down 
a very copious Prufiian blue. 
P. S. In afcertaining the fpecific gravity of the Hydrabad 
Tabafheer, § I. (G), great care was taken in both the experi- 
ments that every bit was thoroughly penetrated with the water, 
and tranfparent to its very center, before its weight in the 
water was determined. 
i 
