136 Scientific Intelligence. 
SCIENTIFIC INTELLIGENCE. 
I. CHEMISTRY AND PHYSICS. 
an Improved Process for preparing Potassium Iodide 
from pee —A.tary and Prriievx have devised an im- 
proved process for extracting potassium fella from the ashes of 
seaweed. e mother liquors, obtained in the preparation of 
a chloride and sulphate from disse ation. are evaporated 
to dryness in a special air furnace and then ca refully roasted in a 
current of air, to complete Pe eRe The residue is ex- 
tracted with cold water and the solution is again evaporated to 
dr A white saline esatas'; is obtained containing 50 per 
cent of iodides. This is pulverized, introduced into a “digestor 
and treated with bot alcohol whereby the iodides are extracted 
and accumulate in the aqueous lower layers. The alcohol is then 
thirds sodium and one-third potassium iodide. To this is added 
the nieamiet A Stem of potassium carbonate, in saturated solu- 
tion, and a nt of carbon dioxide gas is passed through the 
vanes sodium carbonate crystallizes out and potassium 
iodide remains in so fter exact neutralization of the 
the potassium iodide is crystallized out. For special oer it 
is extracted by alcohol and recrystallized.— Bull. at I, 
XXxiv, pe Dec., 1880 
On the Volumes of certain Elements at their Boiling Pointe 
oa as determined the volumes of sodium and bro 
at se boiling sb and in connection with Masson, of tik 
1 
of substance that it contained was evidently that required to fi 
the bulb at the boiling point; i. e. to occupy a known volume. 
Hence the ebullition-volume could be easily calculated. Four 
determinations made in this manner gave for the specific. weight 
of bromine 2°9503, 2°9474, 2°9483 and 2-9471; for its specific vol- 
ume 0°3390, 0°3393, 0°3392 and 0°3393 ; and for _ atomic volume 
27°12, 27°14, 27°13 and 27°15. Or as a mean, wt, 2°9483, Sp- 
vol. 0°3392, and at. vol. 27°135. The pho aphor was fused ip a 
tu 
* J. Chem. ag xxxv, 463, July, 1879. 
