Intelligence and Miscellanies. 397 
58. Ne ew fulminating powder.—Two parts of nitrate. pot- 
ash, two of the neutral carbonate of potash, one of sul 
minating mixture of great energy, the explosive force of 
which has the peculiar property of being continually directed 
downward !—Ferrussac’s Bulletin, Aout 1828. 
59. New compounds of silica and potash, by M. Fuchs.— 
The best method of obtaining this combination is the fol- 
lowing. Melt together 10 parts of carbonate of potash, 15 
of pure quartz and 1 of carbon. The melted mass after 
having been reduced to powder i is subjected to the action of 
of a viscid, opaline liquid, which by further evaporation ei- 
ther spontaneously or by heat, is converted into a solid vi- 
treous transparent mass, fixed in the air, and perfectly simi- 
lar to glass, neg that it is less hard. 
cohol precipitates the aqueous solution. Acids decompose 
ijtin the same manner as the liquor of flints; many salts 
form with it insoluble precipitates. This new — of 
and other objects, to preserve them from ree or as a substi- 
tute for lute in the laboratory.— Idem. 
. Marine salt.—If a concentrated solution be exposed 
ep a “Auman of 8° or 9° Reaumur, fine crystals may be 
obtained, which are often an inch or more in length. 
cold atmosphere they effloresce,—but with heat jad liquify 
im their water of oe 
pying Sense a “spit nat and then add 5 per cent 
