6 4 RESEARCHES ON THE 



If we apply to these bases the results which we have obtained in the case of 

 the ammonia-cobalt compounds, we may consider them as conjugates of platinum, 

 chloride of platinum, and oxide of platinum, with one or two equivalents of 

 ammonia, excepting Raewsky's bases, which may be regarded as containing a 

 deutoxide of chlorine with four equivalents of ammonia. The formula? of these 

 bases become on this view 



Reiset's second base = NB 3 .Pt.O uniacid 



Gerhardt's first " = NH^PtO.O 



" third " = NlCPtCl.0 " 



Reiset's first base = 2NlCPt.O " 



Gerhardt's second base = 2NH^PtO.O " 



Gros's second base = 2Nl£PtC].0 



Eaewsky's first " = Cl(C4NlCPt a 0.0 2 biacid 



" second base = ClO^NlCXClA " 



In comparing the formula? of these bases with those of the ammonia-cobalt 

 compounds, we remark several points of analogy. These are most striking in the 

 case of Raewsky's two bases, which we consider analogous to Xanthocobalt. Thus 

 we have 



Oxide of Xanthocobalt . . . NCC&NHgX!o a 0.0 2 



Oxide of Raewsky's first base . . C10?4NlCPt 2 0.0 2 . 



Raewsky's second base contains chlorine in the radical in place of oxygen. We 

 consider it, to say the least, very probable that there exists an analogous cobalt 

 base having the formula 



NO^NEQMI.O, 

 like 



C1074NlCPt 2 C1.0 2 



and we may here remark that the compound which we have mentioned as one of 

 the products of the action of a current of NO x upon an ammoniacal solution of 

 chloride of cobalt appears to contain chlorine in the radical, since we have found 

 this element in the dark brown-yellow oxalate which is thrown down by oxalate 

 of ammonia from the solution. 



The constitution of Gros's base becomes perfectly intelligible upon this view, as 

 does that of the analogous base containing but one equivalent of ammonia. It 

 can scarcely fail to escape notice that the theory of conjugates brings all the 

 platinum bases under one point of view, and exhibits the analogy in their con- 

 stitution in a very striking manner, by arranging them at once in three groups, of 

 which the first two are exactly parallel. Thus we have for the radicals of the first 

 six bases mentioned the formula 



NlCPt 2NH7Pt 



NEpPtO 2NEQPtO 



NEQPtCl 2NlCPtCl, 



