“ 
340 W. Gibbs and F. A. Genth on the Ammonia-cobalt Bases. 
The formula requires 
F] ound. 
Cobalt, - . 2 18-79 18°61 
Carbonic acid- - 3 21°01 22°34 
The excess of carbonic acid and the deficiency in cobalt, are 
doubtless due to the presence of a portion of the aci carbonate, 
The neutral carbonate loses its water of crystallization in dry 
air, and becomes opaque, with pa lustre of porcelain, like many 
other hydrated salts of this bas 
The acid carbonate of Latsnookale is most readily prepared 
by passing a current of carbonic acid gas into a solution of the 
neutral salt. The acid carbonate Spually separates, after a ve 
short time, in the form of large brown-red or sherry-wine co 
ored crystals, which are less soluble than those of the neutral : 
carbonate. According to Prof. Dana, the crystals of this salt 
belong to the monoclinic system, and closely approach Baryto- 
calcite in form. Fig. 21 represents a crystal of this salt. 
0: == 108° 
C: f= Ke a" Saad 102° 20° 9 
I :jil= a 
Orbe 139° 50" hy, 
£31. 1 at my 
O:-2i = 111° 46/ 7 
a:b: = 07210: 1: 08398, 4 
C = 71° Ne 
In Barytocalcite the angle corrals ne to O: ii = 106° 54’ 
and that corresponding to J: J = 
The acid carbonate of Titteobabal wall its water of hes 
tallization in the air, but loses it under the air-pu 
is particularly interesting as being the only acid salt of Pee 
balt va we have as yet been able to obtain. The formula of 
6NH:s.Co20s, 8COz2+HO, CO: +5HO 
as the following analyses show: 
04715 grs. gave eed grs. sulphate of cobalt = 18:12 per cent cobalt. 
10506 grs. gave 02830 grs. car’ nic acid == 26°93 per cent. 
The formula requires 
Eqs. Found. = ' 
Cobalt, - ol 18-04 18'12 
Carbonic és, = eS wel 26°91 26:93 
The very bongs marked triacid character of Luteocobalt, 
considered as , renders Sean to nat fs he least, improbable that 
— formula of this salt should : 
6NH3.Co:0s. Oe & éfi0, 
