336 W. Gibbs and F. A. Genth 
difficulty by ot boiling, even after the addition of a little am- 
monia. No new base is formed during the decomposition. 
When, iciterral ‘the dry salt is gently heated in a peiroati in cru- 
cible, ammonia is evolved, and if the heat be regulated so that 
no sulphate of ammonia is given off, while the mass is constantly 
stirred, there remains after a few minutes a red mass, which on 
solution in water gives a fine red liquid containing a sulphate of 
a red base, which 3 is probably Purpureocobalt. The reaction is, 
however, a very uncertain one, and has succeeded in our han 
but once. We have in most cases obtamed by the précess de- 
scribed only a mixture of sulphate of Luteocobalt, sulphate of 
cobalt, and sulphate of ammonia. We shall consider this subject ; 
more fally hereafter. Sulphuric acid, if not too dilute, readily 
ecomposes the sulphate of Luteocobalt leh the solution is ‘ 
heated. It appears probable that there exists an acid sulphate 
of this base, as there is an acid carbonate, but we have not been 
able to obtain it a s yet. 
Sulphate of Luteocobalt has the formula 
6NH3.Co20:, 8803+5HO 
as the following analyses g satisfactorily show. The salt analyzed 
, was dried by pressure between folds of bibulous paper only. 
03618 ers. gave 0 Lv ers, sulphate of = = ae = per cent cobalt. 
04993 ers. 0-2 oo 
04790 grs. “ 02122 grs, id. 
12023 grs, 2080 s, sul hace of ‘ie ta = 34:32 per ae bit shure nes 
08203 oh + jeostern yas : =3 33 wee n 
09355 gre “ 05650 grs, water ate e a per ‘can hydrogen. 
11194 gers,“ 06722 grs, 
10005 ars yt 205 ce. miroges at 12° 5 C, atta ed 61 (at 1297) = 19116 
c and 760%” —= 24-00 Pe nitr 
09018 es gave ee ¢.¢, nitrogen at 19° C. and iegnm 36 (at 19°5) = 17126 ; 
760™m == 23°85 per saa nitrogen. 
Our formula requires 
Eqs. Calculated. Mean. Found. 
oe" Or—es 
Cobalt, 2 59°0 16°85 16°83 16°80 16°85 16°83 
Sulph. ‘acid, 3 120°0 3428 84°42 34°52 4°32 
Hydrogen, 23 23°0 6°57 6°69 671 66 
Nitrogen, 6 840 24:00 23-97 2400 23°85 
Oxygen, 8 640 18°28 1809 
3500 —-100°00 
Eby deoousseiiie the a weit i hatha of fae ti ° 
, y to this chemist, there is produced eile these | 
ite a ‘pdtphato-ehiona ie" ide the formula 
