426 Scientific Intelligence. 
tated is a slimy ochre-colored substance which dries to a rust colored 
mass resembling hydrated sesquioxyd of iron. It dissolves in acids with 
a bright yellow color, and gives on heating with chlorhydrie acid,a — 
beautiful red solution of the chlorid. When heated to 300 C, the oxyd 
loses a portion of its water, and when more strongly heated, explodes in 
consequence of the instantaneous separation of the remaining water, 
The author describes in full the double salts RuCle, KCl and RuCh, — 
NACI and gives their reactions with the usual reagents. Ruthenium 
forms, like osmium, an acid containing four equivalents of oxy; as 
well as the ruthenic acid RuOs already described by Claus. To this acid 
Claus gives the name of hyper-ruthenic acid; it may be prepared by pas ; 
ing a current of chlorine into an alkaline solution of ruthenic acid, pre — 
The hyper-ruthenic acid, being volatile, distils over, and may col- 
ected in a réceiver. The new acid is a golden yellow crystalline and 
volatile substance. On gentle heating, it melts into golden yellow drops 
though not acid.- Its boiling point lies not far above 100°C. ie qi 
The acid is very easily reduced. In the moist state its solution 80% — 
mposed after a few hours, with formation of the sesquioxyd. os 
and the greater number of organic bodies easily reduce it. Potash di ‘ 
solves the-acid slowly, but the solution passes after a time into ome : 
thenate of potash. The author gives the relations of this body to% 
water and yield on heating pure metallic ruthenium. When a , 
rid is digested with an excess of freshly prepared oxyd of silver, whi 
