* 
Scientific Intelligence. 101 
SCIENTIFIC INTELLIGENCE. 
I. CHEMISTRY AND Puysics. 
1. Congelation of Mercury in three seconds, by virtue of the sphe- 
roidal state, in an incandescent crucible, (Letter from M. Faraday to 
Boutigny, Ann. de Chim. et de Phys., xix, May, 1847, p. ‘ 
producing congelation of mercury by virtue of the spheroidal state, I 
first heated a crucible to redness and maintained it at this temperature ; 
be advantageous :—2 oz. of solution of caustic ammonia of 0°95 spec. 
grav. are saturated .with sulphuretted hydrogen gas; the hydrosulphuret 
of the same solution of 
mixture is digested in the water-bath until the sulphur is seen to be no 
<a altered and the liquid has assumed a yellow color; it is then 
ed to boiling, and kept at this temperature until the sulphuret of 
The deposited, or excess of, sulph 
the liquid evaporated to crystallization. In this way from 34 to 34 oz. 
