S. P. Sadiler on Fischer's Sait. 199 
of the salts of roseo-cobalt and showed under the microscope a 
star-shaped aggregation of small crystals. 
I also formed in the soda-salt solution a yellowish xantho- 
cobalt compound having probably an analogous constitution 
but did not get enough of it to analyze. Examined under the 
microscope, the crystals were seen to be of a peculiar cup-shaped 
appearance and quite large and pointed. 
he ammonium salts were next examined. That one at least 
existed had been found by Gibbs and Genth,* although it had 
not been analyzed by them. Erdmannt had, however, formed an 
ammonium salt exactly corresponding to Fischer’s salt. I sue- 
ceeded in forming this and another, the two exactly correspond- 
Ing in constitution to the two soda salts. The circumstances un- 
der which the different salts form I am not able, however, to state 
at all positively, except that in forming the 3-atom salt I had 
more concentrated €oCl, and NH,N®, solutions. They are 
both bright yellow and could not be distinguished by their color. 
e may term them the di-ammonio-cobaltic nitrite and the tri- 
ammonio-cobaltic nitrite, their formulas being respectively 
€0,6N0,4+4(NH,N®,)+2H 0 
and €0,6N0,+6(NH,N9,)+2H,29. 
The following were the analytical results : 
Two-atom Salt. 
‘4495 gr. salt gave -2022 gr. €CoSO,=—21°77 p.c. CoO=—24°09 p.c. 
Co,0.,.. 
T hree-atom Salt. 
2992 or. salt gave ‘1145 gr. CoSO,—=1853 p.c. CoO—20°51 p.c. * 
50,6... : 
"4169 gi. salt gave -1602 gr. CoSO,=18'59 p.c. CoO=2058 p.c. 
S.0.. 
©0,6N6, +4(NH,NO,)+2H, 0. €0,6N6,+6(NH,NO,)+2H20. 
Theor. pr. ct. Found pr. ct. Theor. pr. ct. Found pr. ct. 
€o,6,—24-20 24-09 20°39 20°55 
Lang is more nearly right in the case of these ammonia com- 
Brads than in regard to the soda salts, they being much more 
solu 
* Researches on Ammonia cobalt bases, p. 48. 
‘Ammonia cobalt bases, pp. 40, and 18. 
