120 W. Gibbs on the Hexatomic compounds of Cobalt. 
Calculated, Found, 
Cobalt 2 118 22°09 22°28 22°21 
so, 1 96 17°97 17.98 
Hydrogen 24 24 4°49 4°63 
Nitrogen 12 168 31°46 31°33 
Oxygen 8 128 23°99 ide 
534 100-00 
On Blomstrand’s view of the constitution of the ammonia- 
metallic bases, the formula of the sulphate may be written : 
NH, —NO, 
_ | NH,—NO, 
“ ) NH,—NH. 
Co.) NH’ NH’? 
NH,—NO, 
NH,—NO 
in beautiful iridescent crystals. The forms of these crystals 
together with those of other salts of this series I hope _here- 
after to be able to give in detail. The chloride has the charac- 
teristic sherry-wine color of the salts of this series, and the 
a crystals are very brilliant and exhibit a remarkable iti- 
Co,(NH,),(NO,),Cl, 
as the following analyses show: 
0°7188 gr. gave 0°3027 gr, silver 13°34 “ chlorine. 
0°4846 gr. gave 0°2152 gr. water = 4:92 “ h drogen. 
0°6160 gr. gave 172°5 ¢, ¢, nitrogen at 16° C, and 768°2"%— 32°01 
r cent, 
