146 Seientifie Intelligence. 
SCIENTIFIC INTELLIGENCE. 
I. CHEMISTRY AND PHYSICS. 
1. On metallic Thorium.—Nitson has succeeded in preparing 
pure metallic thorium and in determining its properties. For 
layers with sodium, pressed firmly down with a piston, and then 
more sodium chloride. The tube cap 
and heated to a moderate red heat in a furnace. The reauction 
an agate mortar give a silver streak. Metallic thorium is perma 
nent in the air up to 100° to 120°, Heated higher, it ignites even 
below redness, giving a brilliant light and forming snow-white 
oxide. Its attraction for oxygen is so great, that when heated 
This latter on examination was found to contain 19°4 per cent of 
oxide. Calculating this out, the specific gravity becomes 10°9178. 
— Ber. Berl. Chem : F. B 
1 ‘ : 
2. On the atomic weight of Thorium.——Nirson has determined 
by e 
tion of the chlorides treated with hydrogen sulphide, filtered, 
treated with ammonia and decanted from the olive-green hydrate- 
