404 Correspondence of J. Nicklés. 
ing and we will give it in a few words. Starting with the purification 
pump, the dry gas is directed to a column of glass or sandstone furnished 
with trays or diaphragms pierced with small holes, from which descends 
HO SO? in a finely divided state to meet and dissolve the C#H#. This 
solution takes place slowly, so that the apparatus needs as many as forty 
trays to arity enough sulphuric acid to absorb the gas and be satu- 
rated wit 
The sul foils acid thus obtained is next treated with five times its 
volume of water, and the mixture submitted to the action of, a stream of 
apo 
vapor which carries over the alcoholic product. The rs are con- 
densed ; the alcoholic liquid thus ob ange is re-distilled over a little 
lime, to separate any sulphuric acid may have distilled over, and 
the residue of this operation is, as we have — sulphuric acid of 20° 
to 25°, and a gaseous mixture representing the gas from ordinary coal 
or HS, NH, and C+H*: this latter can be advantageously used for 
ue 
New method for the concentration of mineral waters. —Sea-water in 
freezing, forms flakes of ice consisting of nearly pure water, and an ex- 
tremely saline liquid which in Northern countries is utilized in the pro- 
duction of marine salt. Very recently, Dr. Robinet, a physician of Paris, 
has diseovered a the s same process can be applied in rine 
m 
now gs to Awe water on board ships, no longer of distillation 
ch: ; 
em. 
pieces litres of mineral water can thus be reduced to 5, giving great 
economy in transportation ; moreover, the ice itself is also valuable. But 
_ we do not believe that the srgte spain properties < the extract will be 
identical with those of the water in its original state, because of the 
changes which manifestly take sm aor in die contained salts, changes 30 
ee snipe ys r. Balard has been able Srna hora 
_ Of sulphate ie apeapania S08; sis eevee from the ow the 
_ Waters containing NaCl rol al cor srhehs sepely teoes the manufac- . 
