W. Gibbs on the Hexatomic compounds of Cobalt. 285 
Co,(NH;), »Cle+Co, (NH) 10(NO,)2(NO;),= 
2004 (NH); »(NO2)(NOg) Cl. 
0°2125 gr. gave 0°1161 gr. SO,Co=20°80 per cent cobalt. 
0°5933 gr. gave 0°2470 gr. silver =13°70 per cent chlorine. 
0°7888 gr. gave 0°3308 gr. silver 13°78 per cent chlorine. 
These numbers approximate to those required by the formula, 
Co,(NH,), ,(NO,).(NO,),Cl,- I attempted in like manner 
to form salts synthetically by mixing other salts in the propor- 
tions indicated by the equations: 
Cog (NH,) ,,(NO,)g-+Co,(NH,) 1 (Clg=C02 (NH) 10(NO2) sls: 
Co, (NH,) ; o(NO4)¢+002(NHs3)10(NO2)2(NO3s= 
Co,(NH;)9(NO2)(NO5)s- 
The experiments led, however, to no definite results. 
The chloro-nitrate above described is the salt to which I, at 
nitroxyl, NO,, hav 
little in solubility, so that it is extremely difficult to oe 
i I believed to be thes 
should not exist, but 
Krok’s analyses do not appear to me sufficient, as the cobalt, 
ined, and not the whole 
: Its Kro 
with the formula Co,(NH,), ,CK(NO,), +30H,. There is no 
a compound 
e salt can be recrystallized without decomposition, or 
metallic chlorides. 
- * Acta Univers., Lund, 1870. 
