300 SS. L. Penfield—Chemical Composition of Amblygonite. 
undissolved portion after incinerating the filter paper was 
treated with hydrofluoric acid, then with a drop of sulphuric 
acid; the hydrofluoric acid expelled by evaporation and the 
solution added to the other solution of the bases. To obtain 
the bases as chlorides the sulphuric acid was precipitated from 
the solution with barium chloride, and the barium sulphate 
filtered off. The solution was then heated to boiling and a hot 
solution of barium hydroxide added; this precipitated all the 
phosphoric acid and part of the alumina. The solution con- 
tained all the lithia and most of the alumina which went into 
sulphuric acid, and the alumina precipitated wit 
from lithia. The filtrate was evaporated to dryness, the ammo 
nia salts expelled by ignition, traces of barium separated a 56 
ond or third time when necessary, evaporated to ey 
un, lithia separated from soda and potash by means a 
absolute alcohol and ether, the lithia weighed as sulphate — 
the soda and potash as chlorides. The chlorides were t@& 
carefully for potash by evaporating with excess of platinum 
