24 



PROCEEDINGS OP THE AMERICAN ACADEMY 



phurous oxide is given off, but it is only by strong heating that the 

 whole of the oxide can be expelled. Of this salt : — 



0-7132 gr. gave 0-3800 gr. SO^Co = 20-27% cobalt. 

 1-7094 gr. gave 2-0505 gr. SO,Ba = 32-94% SO^. 

 1-5422 gr. gave 0-9228 gr. water = 6-G4% hydrogen. 

 0-8927 gr. gave 183 c.c. nitrogen at 15*^-5 C. and 765-14""° = 

 24-07%. 

 Tlie formula Co^j (NH3)jo(S03)3 + 30U^ requires : — 



Calculated. Found. 



2 20-27 20-27 



3 32-98 32-94 

 10 24-05 24-07 

 36 G-18 6-64 



I have assigned this salt somewhat arbitrarily to the roseocobalt series. 

 In the absence of any direct evidence on either side, it is of course 

 equally probable that it belongs to the series of purpureocobalt. 

 Kiinzel's salt, 



Co,(NH,),o(S03)3+Co,(SO,)3+90H„ 



bears the same relation to the neutral sulpliite which I have de- 

 scribed which the cobalto-nitrite, Co._,(NH.,)jg(NOJa-l-Coo(N02)c, 

 bears to the normal nitrite Co2(NH3),„(NOo)e. 



The salts known with most certainty to belong to the roseocobalt 

 series are the following : — 



Cobalt, 



Sulphurous Oxide, 

 Nitrogen, 

 Hydrogen, 



Chloride, 



Nitrate, 



Sulphates «, ^, y, 



Acid sulphate, 



lodo-sulphates «, ^, y* 



Bromo-sulphate,* 



Dichromate, 



Basic oxalo-sulphate, 



Oxalate, 



Acid oxalo-bisulphate, 



Arid oxalate, 

 Ferricyanido, 



Co,(NH3),oCl,+20H, 



Co.,(NlI,)„XNO,),;+20H, 



Co,(NH3),„(SO,)3+50H, 



Co,(NIl3)„(SO,),+SO,ir,+40H3 



Co,(NH,),„(SO,),I,+2()H, 



Co.,(NIl3),„(SO,).,Br.,+20II., 



Co;,(NII,),„(Cr.,0;)3+50ri, ' 



Co,(NII,),„.0.(CA)(«0,)+70IIa 



Co.,(NII,),„(C..O,)3+60II., 



Co,(NII,),„(CA)(SOJ,-f-CJIA+ 

 2011^ 



Co,(NH3),o(CA):.+4C,HA 

 Co,(NIl3),„Cy«+FeXy„+30H, 



* ICrok, loc. cit. 



