on the — » dea &e. 297 
¥ 
en i aed 
_ other Seiniae tafte. 
G. Concentrated vitriolic acid was added to one portion of 
the precipitate D. 3; concentrated nitrous acid to a fecond 
portion; and marine acid to a third portion. No effervefcence 
could be obferved, nor was there any appearance of folution. 
After ftanding one hour water was added; and the acids, thus 
diluted, were fuffered to remain upon the portions of the pre- 
cipitate for another hour. They were then decanted, and fatu« 
rated with mild foffil fixed alkaly, but without any appearance 
of precipitation. 
_.H. The part precipitated by the phlogifticated alkaly, when 
mixed with nitre and borax, and fluxed by a blow-pipe upon 
charcoal, formed a black glafs; upon flint-glafs, a white; and 
upon a tobacco-pipe an opaque yellowifh. white one. 
_ 2. Another portion melted with foap and borax ina crucible, 
formed a black glafs, but without any metallic appearance. 
I. The infoluble refiduum (A.) was boiled in water, the 
water decanted, and mild fixed apealy added, but without any 
fubfequent precipitation. 
2. This infoluble powder was not attacked by the nitrous or 
marine acids; but being put into vitriolic acid, and boiled a 
confiderable time until the acid became highly concentrated, it 
diffolved entirely, and feparated again upon the addition of wa- 
ter. It will appear in the fequel, that the fame thing happens 
to marmor metallicum, when diffolved by boiling in the acid 
- of vitriol. 
over. LAK. 7” Rr CO Ne 
