on the Ammonia- c oh alt Bases. 103 



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posed. The ammonia-platinura bases at present known are 

 eight in number, of which two were discovered by Reiset, one 

 bj Gros, two by Eaewsky, and three by Gerhardi The em- 

 pirical formulae of these bases are as follows : 



Reieset's first base = 



- NsHePtO 



uniacid 



" second base : 



- NHsPtO 





Gros's base :: 



= ^^inePtClO 





Gerhard t's first base : 



- NH3Pt03 





" second base = 



:= NallePtOi 





" third '' z 



- NHsPiCIO 





Raewstv's first " : 



- mHl2Pt2C105 



biacid 



, " second " : 



zr N4Hl3Pt2Cl204 



(( 



If we apply to tliese bases the results which we have obtained 

 in the case of the ammonia-cobalt compoundSj w^e may consider 

 them as conjugates of platinum, chlorid of platinum, and oxyd 

 of platinum, with one or two equivalents of ammonia, excepting 

 Haewsky's bases, which may be regarded as containing a deut- 

 oxyd of chlorine with four equivjuents of ammonia. The for- 

 mulae of these bases become on this view 



Reiset's second base i= NHa , Ft . uniacid 



Gerhardt's first " = NHrPtO.O « 



**- « third " = NHrPtCLO 



Rcieset's first " = 2NH3?Pt . O 



Gerhardt's second base = 2NIl37ptO.O 



Gros's second base = 2Xll^PtCL0 « 



Ptaewsky 's first " — C102?4Nn3 . PtaO . O2 biacid 



« SQcond base r= CIO2 . 4XII3 . PtaCl . O2 



<i 



In comparing the formulae of these bases with those of the 

 ammonia-cobalt compounds, we remark several points of analogy. 

 These are most striking in the case of Eaewsky ^s two bases, 

 which we consider analogous to Xanthocobalt. Thus we have 



Oxjd of Xanthocobalt, NOaToNHrCosO . Oa 



Oxyd of Pvaewsky's first base, ClO^4NIl3?Pt20 . Oa. 



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 



NOa - 5NH3 . C02CI . Oa 



like cior4Nnrpt2Ci . 0% 



and we may here remark that the compound which we have 

 mentioned as one of the products of the action of a current of 

 NOx upon an ammoniacal solution of chlorid of cobalt appears 

 to contain chlorine in the radical, since wx have found this ele* 



