511 



some of the compounds of protochloride of platinum becomes per- 

 ceptible. 



First Series. 



Compounds of protochloride of 

 platinum. 



PtCl 

 H 4 NCl,PtCl 



X 

 (C 2 H 4 



H e 



Compounds of ethylene-dichloride of 

 platinum. 



(C 2 H 4 Pt 2 Cl),Cl 



H 5 ) I Nclj ^ H ^ p^ 



H 4 ) 1 Na Clf 



2pt C1 



Pt 



(C 6 H 5 ) 



NCI 

 NCI 



(G.HJ1 



H fl / 



Second Series. 



H 3 



(C 2 H 4 Pt 2 Cl)J 



(C 6 H 5 ) 



NCI 



NCI 



(C 2 H 4 Pt a Cl) 



(C a H 5 ) 2 

 H 



TC 3 H 4 Pt 2 Cl) ( 



(C a H 4 ) ^ 

 H 4 



(C 2 H 4 Pt 2 Cl)J 



(C '^NC, 



Pt 



(CrH<; 

 pt 4 2 



The compounds of ethylene-dichloride of platinum with ammonia 

 and chloride of ammonium here mentioned have already been de- 

 scribed by Zeise ; the remainder, as well as the greater number of the 

 protochloride-of-platinum bodies, are new. 



The detailed examination of these compounds, which are for the 

 most part beautifully crystallized, is not yet completed ; but we take 

 this opportunity of mentioning an observation which seems to give a 

 more decided support to the view we have expressed regarding the 

 relation of the series of ethylene-dichloride-of-platinum and that of 

 the protochloride-of-platinum compounds. If the aqueous solution 

 of the easily soluble body 



be boiled, a considerable quantity of gas is immediately cooled, and 

 at the same time beautiful yellow, difficultly soluble needles are depo- 

 sited containing 



