170 H. Rose on a new mode of preparing Aluminium. 
In a large iron crucible 35 grams of cryolite powder were 
stratified with 14 grams of sliced sodium, and the whole covered 
with a thick stratum of chlorid of potassium. The crucible cov- 
ered with a porcelain cap, was placed in a larger earthen-ware 
crucible, also covered, and exposed during an hour to a good 
charcoal fire in a well drawing wind furnace, and cooled as 
slowly as possible. The product in aluminium was in’ this case 
remarkaly small, only 0-135 gram. in globules being separable 
from the molten mass 
reached its highest point of incandescence. 
on admirably. I permitted the whole to cool in the hydrogen 
Aluminium has yet hardly been obtained directly from alumina. 
otassium and sodium appear to effect the reduction of the me- 
