116 W. Gibbs on the Hexatomic compounds of Cobalt. 
Art. XV.—Researches on the Hexatomic compounds of Cobalt ;* 
by Wo.coTT Grsss. 
In the joint memoir of Genth and myself on the ammonia- 
cobalt bases it was stated that Xanthocobalt is not the only 
product of the action of nitrous acid gas upon ammoniacal 
solutions of cobalt. urther investigation of this and other 
ground as completely as possible. 
1. Action of ammonia and ammonic nitrite upon a solution of 
Co,(NH,),(NO,),(NO3).. 
e formation of this salt is accompanied by an absorption of 
oxygen from the air and may be expressed by the equation: 
2CoCl,+2NH, .NO,+8NH,+4NH, . NO,+0=—Co, 
(NH;)(NOz),(NO,).-+4NH,Cl+2(NH,),0. 
‘2. Action of a mixture of ammonia and potassic nitrite upon 
cobaltic sulphate.— When cobaltic sulphate is dissolved in watet — 
and a mixture of ammonia and potassic nitrite is added, the 
liquid speedily becomes brown upon the surface, and after a few 
hours orange-yellow crystals form upon the bottom and sides 
*Being Part II of Researches on the Ammonia-cobalt bases, by Wolcott Gibbs 
and F. A. Genth. 
