[ 5 ° ] 
” A black fliining fand from Virginia examined by 
Dr. All. Moulen. 
A (mail vial filled with ordinary white fand, and 
containing only 3 i. gr.xi. being filled with the Vir- 
ginia fand, was found to contain Jij, By. gr. i. 
This fand did apply to the magnet both before and 
after calcination j but the latter did apply bettei to it 
than the former. .... 
A parcel of this fand, mixed and calcined with pow- 
dered charcoal, and kept in a melting furnace for a- 
bout an hour, yielded no regulus: but applied more 
vigoroufly to the Loadftone than either of the for- 
I fluxed a parcel of this fand with fixed nitre, m 
a melting furnace, for above an hour, but could ob- 
tain no regulus; nor any fubftance that would apply 
to the magnet, except a thin cruft that ftuck firmly 
to a piece of charcoal that dropt into the crucible 
when the matter was in fufion. . 
I fluxed it alfo with falt-petre and powdered char- 
coal, dropping pieces of charcoal afterwards into the 
crucible It continued about half an hour in the 
melting furnace in fufion, and that without produc- 
ing a regulus, or a fubftance that would apply to the 
magnet, excepting only what ftuck to the charcoal 
as in the former experiment. , 
I fluxed another parcel of it with falt-petre and 
flower of brimftone, without being able to procure 
“1 pom'cd good fpirit of fait on a parcel of this fand, 
but coulcTcbferve no Inflation thereby produced. 
I poured fpirit of nitre, both ftrong and weakened 
