On Sodalite. 307 
white precipitate which fell, collected by the filter, and 
boiled while yet moist in potash-ley. The bulk diminished 
greatly, and the undissolved portion assamed a black co- 
lour, owing to some oxide of mereury with which it was 
~ contaminated. 
5. The potash-ley being passed through the filter, to free 
it from the undissolved matter, was mixed with a sufficient 
quantity of sal-ammoniac, A copious white precipitate 
fell, which being collected, washed, dried, and heated to 
redness, weighed 27-7 grains. This powder being digested 
in sulphuric acid, dissolved, except 0°22 grain of silica. 
Sulphate of potash being added, and the solution set asides 
it yielded alum e¢rystals to the very last drop. Hence the 
27°48 grains of dissolved powder were alumina. 
6. ‘The black residue which the petash-ley had not taken 
up, was dissolved in diluted sulphuric acid. The solution 
being evaporated to dryness. and the residue digested in hot 
water, a white soft powder remained, which, heated to red- 
ness, weighed 36 grains, and was sulphate of lime, equi- 
valent to about 2 grains of lime. 
7. The liquid from which the sulphate of lime was se- 
parated, being exacuy neutralized by ammonia, succinate 
of ammonia was dropped in; a brownish-red precipitate 
fell, which, being heated to redness in a covered crucible, 
weighed 1 grain, and was black oxide of iron. 
8. The residual liquor being now examined by different 
re-agents, nothing further could be precipitated from it. 
g- The liquid (No. 4), from which the alumina, lime, 
and iron bad been separaied by carbonate of potash, being 
boiled for some time, let fall a small quantity of yellow- 
coloured matter. This matter being-digested in diluted 
sulphuric acid, partly dissolved with effervescence; but a 
portion remained undissolved, weighing 1 grain. It was 
msoluble in acids, and with potash melted into’a colourless 
glass. It was therefore silica; The sulphuric acid solution 
being evaporated to dryness, left a residue, whicl possessed 
the properties of sulphate of lime, and which weighed 1-2 
grain, equivalent to about 0°7 e@rain of lime. 
10. The constituents obtained by the preceding analysis 
being obviously defective, it remained to examine whether 
the miueral, according to the conjecture of Bournon, con- 
tained an alkali. For this purpose, 100 grains of it, re- 
duced to a fine powder, and mixed with 500 grains of ni- 
trate of barytes, were exposed for an hour to a red beat, in 
# porcelain crucible. The fused mass was softened with 
Ue water, 
