on the Ammonia-cobalt Bases. 339 
94330 grs. gave 0-2040 grs. sulphate of cobalt = 17-99 per cent cobalt. 
0:4228 grs. gave 0°2000 ers. ra * == 18:00-; © fe 
05345 grs. gave 0°2529 grs. “ “« =1801 “ = 
_ 20805 grs. gave 08380 grs. carbonic acid = 32°95 per cent oxalic acid. 
The formula requires 
Eqs. Calculated. Found, 
° ca LEI TIT Wc SIRES. 
Cobalt . ; 2 17°93 17°99 1800 18-01 
Oxalic acid. = a 32°82 32958 ——_—-  —— 
we have not yet been able to obtain such a salt. The oxalic 
CARBONATES OF LUTEOCOBALT. 
The neutral carbonate of Luteocobalt is readily formed by 
decomposing a solution of chlorid of Luteocobalt by carbonate 
of silver. The yellow solution, by evaporation, pg sherry- 
The salt 
€ air, and crystals of the acid carbonate are found mixed with 
those of the neutral salt. According to Prof. ’s_ measure- 
ment, the crystals of the neutral carbonate belong to the trimet- 
Nie system, and approach aragonite in form. Fig. 20 represents 
4 crystal of this salt: ; 
20. 
F.:I = 116° 50’ 
ZT 34 = 121° 85’ 
1t : 1% (top) = 114° 16’ ; I 
1%: 1% (over) it = 65° 44’ 
~@ >b:e = 10509: 1: 16265 
The constitution of the neutral carbonate appears to be repre- 
Sented by the formula 
6NH:.Co20s, 8CO2+7HO. 
2495 grs, gave 0-1220 grs, sul of cobalt = 18°61 per cent cobalt. 
8518 grs. gave 0-0786 pats men ag acid = 22°34 per cent. 
