478 Scientific Intelligence. 
From these numbers it follows: Ist, that Cl should displace Br 
and I, and Br should displace I, in the hydracids both when gas- 
; this is co 
eous and in solution; this mon knowledge; 2d, that Cl 
hydrogen sulphide. These facts were experimentally established 
by placing hydrogen sulphide in a sealed tube containing I, and 
heating to 500°; no reaction took place. But HI gas on the con- 
trary reacts on S even in the cold, and if the tube be opened under 
water, the latter rises in the tube, remaining transparent till the 
inverse reaction takes place in solution, the iodine decomposing 
now the hydrogen sulphide again, with deposition of sulphur. 4th, 
that oxygen should displace 5 from hydrogen sulphide, a common 
reaction; 5th, that between chlorine and oxygen, an equilibrium 
should be produced, since on the one side gaseous chlorine should 
‘decompose water to form HCl in solution, and on the other gas- 
eous oxygen should decompose dry HCl gas, to form water and 
chlorine. In proof of this, Berthelot mixed HCl and O in a 
sealed tube and passed sparks through the tube for several hours 
with the result, that nine-tenths of the HCl was decomposed, 
burns with a red flame, a good lecture po gc aoe The inverse 
at does not take place.— Bull. Soe. Ch., I, xxxi, 309, April, 
1879, 
ara is therefore not far from zero.— @. R., 1xxxviii, 236, Feb. 
G. F. B, 
4. On the Yiterbia of Marignac, and on a New Element, 
Seandium.—N ison, who was on the point of commencing an in- 
vestigation of the gadolinite and euxenite earths when Marignac’s 
go ig anger ee has p ded with it since this chemist has given 
it up for want of material. Having 63 grams of erbia, the 
