114 Scientific Intelligence. 
12, Solubility of Sulphate of Lime; by M. Antuon, (Chem. Gaz., 
May 1, p. 173, from Buch. Report, xli, 363.)—M. Anthon. digested 
pure artificially prepared gypsum, at the ordinary temperature, in a 
close vessel with distilled water, and in another with a saturated solu- 
tion of common salt. On examination he obtained from 1000 grains 
of the first liquid with chloride of barium, 31 grains, and from the 
second, 11-1 grains, sulphate of baryta.. In accordance with this, gyp- 
sum dissolves in 438 parts pure water, and in 122 parts solution of 
chloride of sodium 
3. Analyses as Glass ; by M. Pettcor, (L'Institut, No. 638, March 
28, 1846.) —Bohemian fine glass—silica 76, potash 15, lime 8, alu- 
mina 1. 
Bohemian agate sheak-satian 80: 9, potash 17:6, alumina 8, traces oh 
oxyd of iron 0:8, lime 0°7. 
Artificial aventurine from the works at Murano wed Venice—silica 
67-7, lime 8-9, sesquoxide of iron 3:5, oxyd of tin 2°3, metallic copper 
3°9, oxyd of lead 11, potash, soda 12°6, with traces of alumina, mag- 
nesia, and phosphoric or boracic acid. From this analysis it appears 
that this aventurine differs widely from the glass made in imitation 
of it by MM. Frémy and Clémandot.* 
14. On the Solubility of Fluoride of Calcium in water, and its Re- 
lation to the occurrence of Fluorine in Minerals, and in Recent and 
Fossil Plants and Animals; by Grorcze Witson, M. D., F.R.S.E., 
(Chem. Gaz. May 1. 1846, p. 183—read before Roy. Soc. Edinb.)— 
After a preliminary reference to the existence of fluorine in recent an 
fossil bones, Dr. Wilson stated that he had made a series of experiments 
with a view to discover what solvent carried fluoride of calcium into 
the tissues of plants and animals.» . 
His first trials were made with cambedie: acid, which was passed i in 
a current through water containing pure fluor-spar in fine powder sus’ 
pended init. The fluor-spar was, by this treatment, dissolved, yielding 
a solution which precipitated oxalate of ammonia, and when evaporated 
left a residue, which on being treated with sulphuric acid gave off by- 
drofluoric acid. ‘The author was inclined, in consequence, to suppose 
that carbonic acid conferred upon water the power of dissolving fluo- 
ride of calcium; but on observing that, long after the whole of that 
gas had been expelled by warming the liquid, the latter remained un- 
troubled, he became satisfied that water alone can dissolve fluoride of 
calcium, contrary to the universal statement of writers on chemistry. 
On prosecuting the inquiry, he found that water at 212° dissolved 
more of the fluor-spar than water at 60°; but. he has not yet ascer- 
tained tard sor sroreeoneyabon, up by that liquid at either re: 
"See this Journal, Second Series, , 430 e : 
