S. P. Sadtler on Fischer's Salt. 203 
Tri-potassio-cobaltic nitrite, ©0026 N 82+6(IKN O2)+aq. 
Di-sodio-cobaltic nitrite, €0.6 N O,+-4(NaN 02)+H28. 
Tri-sodio-cobaltic nitrite, €026N 0.+6(NaN C2) +H2 8. 
Di-ammonio-cobaltic nitrite, €036 N 8.+4(N HyN 62)+2H289. 
Tri-ammonio-cobaltic nitrite, €0,6N 02 H,N ©2)+2H20. 
Luteocobaltio-cobaltic nitrite, €o26N O.+€0,12N Hy, 6N 02+H,29. 
Roseocobaltio-cobaltic nitrite, €0.6 N O,+ C021 0N Ho, 6N 62+H,9. 
Xanthocobaltio-cobaltic nitrite, 
Potassio-dicobaltous nitrite, 2(€o2N ©2)+-2(KN 62)-+- E29. 
Potassio-monocobaltous nitrite, €0,N 02+ 2(KN ©2)+H29. 
These it will be seen are capable of ready conversion into atomic 
formulas, thus: Co2"[K(NOg)2]6 and €o2"[(Na(NOz)2), (NO2)s] - 
and so on 
both 
as well as to the rotoxyd salts, the. double sulphates formed 
having of course a constitution depending upon the tg. pee 
of the bases in the origi ts. The soda sulphates did not 
the accuracy of this method. Four determinations of 
€08+K,0 were made in preparation No. 6 of Fischer’s salt in 
the manner described. e percentages of double oxyds were 
48-71, 48°69, 48°66, 48-71. This method auhet 
ts are to be noti 
without obtaining good results. vi nee ° 
however. The salt in which Gauhe sought to verify the aed 
sition of the double sulphate was plainly a mixture OF NG 
and “neutral” salt, He says, “after some days small amounts 
deposited.” This was before Erdmamn’s paper had appeared. 
* on Ammonia cobalt bases, p. 49. : 
+ Zeitsch. Anal. Ch., iv, p. 56. 
