8 Art. 2.— T. Suzuki: The Change of 



by Rosenheim and Koppel wlio introduced this method of getting 

 cobaltinitrites and bydroxynitrites, and prepared several of them 

 for the first time (Zeit, anorg. Gheni., 1898, 1 7, 35). The hydroxy- 

 cobaltinitrites, tliey obtained and analysed, were a cobaltous, a 

 barium, a strontium, a zinc, and a silver liydroxycobaltinitrite, 

 whilst others were met with. 



It will be seen tbat the method followed in preparing these 

 hydroxycobaltinitrites is not well suited for the investigation of 

 the problem which is the subject of the present paper. For, in 

 presence of nitrous acid and nitric peroxide, there will occur some 

 neutralisation of basic nitrite by the former, — 



Co(N02)(OH) + HNO, = Co(N02), + H,0, 



and possibly some production of cobaltic nitrite from cobaltous 

 nitrite and nitiic peroxide, — 



Co(N02), + N02= Co(NO,)3, 



whereby the nature of the self-transformation of the cobaltous 

 nitrite becomes obscured and the course of the cliange interfered 

 with. Another objectionable feature of this mode of preparing 

 hydroxycobaltinitrites is the production of more or less nitrate, 

 Avhich seems unavoidable. 



In spite of the comparative uu suitability of their j^rocess from 

 the point of view of this paper, it was necessary to repeat, if 

 possible, some of Rosenheim and Koppel' s work, the results of 

 which were hardly consistent with those which had been got by 

 using the Lang process. The cobaltous salt tliey have described 

 was apparentl}'- indistinguishable from that now described in this 

 paper (p. 2) except in composition. A re-examination of the 

 cobaltous salt thus prepared was therefore decided upon. 



Nitrous gases were passed into water holding cobalt carbonate 



