194 W. Gibbs on the Hexatomic compounds of Cobalt. 
[ N<0SN—0-0K 
3 0 
NH,-—NH, -Cl N<9>N-0-OK 
: N<)>N-0-0K 
NH,—NH,—Cl ce O 
Pie aay N<o-N—0—-0K 
N<@>N-0-0K 
N<@>N-—0—0K 
L 
Go, | NHs—NH,—Cl 
NH,—NH,-—Cl 
The manner in which these compounds may be derived from 
each other by replacement is rms obvious, and is best 
late. 
mann’s analyses leave no reasonable doubt as to the con- 
stitution of the ammonia-nitrites. I have thought it worth 
while, ee to make a few emai ‘analyses in support 
f his In the potassium 
: erp gr. gave 0°3397 gr. SO, Co wd so Kg 75 “54 per cent. 
“7338 gr. gave 0°5615 gr. = 76°52 per cent. 
o- 5937 gr. gave 127 c.c. tiga at 6°°5 C. and 7738™™-4—=26°45 per 
cent nitrogen. 
The formula Co,(NH;),(NO,),K, requires 76°58 per ¢ 
2S0,Co+S0,K, and 26°58 per cent nitrogen. In the silver Bere 
0°3580 gr. gave 0:2902 gr. SO,Co and SO, Ag,. 
: sae gr. gave 0°1675 gr. silver=28 ‘21 per cent. 
The t by difference amounts to 1533 percent. The for- 
mula Coan s)(NO1)sAgs requires 28°05 per cent silver and 
15 . r cent co 
allium salt. aie a solution of the potassium salt is added 
to a of thallous nitrate, a beautiful sherry-wine-colored crys- 
talline precipitate is thrown down, which on recrystallization 
gives very well defined prismatic erystals, having apparently 
_ same form as the corresponding potassium and ammonium 
ts. 
Mercurous salt.—A solution of potassic ammonia-cobalt-nitrite 
gives immediately in Epienene of mercurous nitrate a beautiful 
