An the records of the Roy:l Soc. of Sciences of Upsala for the year 1866, I published 

 a mernoir in the Svedish language entitled »Om Ammoniakaliska Platina Föreningar» (on 

 ammonia-platinum compounds), in which I gave a detailed account of some researche.s 

 concerning the compounds of two ammoniacal platinum-bases, viz the first base of Reiset 

 and the base of Gros. In the present treatise I intend to lay down the results of my 

 latest researches on the ammonia-platinum-compounds, but having given a short history 

 of the matter in the paper of 1866, I think it necessary here first to review the pro- 

 gress of this part of chemistry since 1866. 



Nearly at the same time as my treati.se was printed Mr Hadow 1 ) published some 



researches on ammonia-platiiiuni-compounds. Mr Hadow found that the basic mono- 



roH 

 chlornitrate of Gros' basis Pt {4 nh 3 .2no 3 2 ) (or the nitrate of Raewsky) produces with 



I Cl 



the chloride of ammonium a chloridc, for which he gives the formula (Pt, 4 NH 3 .C1 3 )., O. 



f OH 

 This chloride is doubtless the same as that for which I gave the formula Pt \ 4 nh 3 ci, 



| Cl 



(Ani. Plåt. För. p. 58), which differs from that of Mr Hadow by a plus of l / 2 OH 2 . 

 Mr Hadow also analysed the blue eompound, which nitrous acid produces with the 

 salts of the base of Reiset and he found the composition the same as I did, or agreeing 



with the formula Pt \ 4 nh 3 . 2 N0 3 . By the action of nitrous acid on the chloride of 



I no 2 

 Reiset Mr Hadow obtained a green product, for which he gives the doubtful equi- 



valent formula 2 n 2 H,.Ptci\ 



no, hci | 



By the action of nitric acid and the nitrate of RiBWSKY un the protochloride of 



platinum or on the green chloride of Magnus, M. Hadow obtained a brown product, 



whose composition, according to Mr Hadow, may be represented by the equivalent 



formula 5 W* H « pt 2 cl 2> [ 



n 2 h 6 pt, ci 2 o 2 2 NO g | 



but the composition is so varying that one is inclined to believe that Mr Hadow has 



analysed a mixture of different compounds. The mode of formation of the matter as 



well as its colour makes it appear very probable that it may have been principally 



! ) Chem. Soc. Journ. (2) 4. 1866 p. 345. 



2 ) In this treatise the signs are always used to represent atoms, not equivalents, except where the latter are 

 distinctly stated to be used. 



