18 P. T. CLEVE, 



Comparing this with the calculated results we have: 



Found Theory 



1 a 2 



Platinura 72,82 73,69 — 



Carbon — — 8,53 



Hy drogen — — 1,62 



Nitrogen 



395,?6 



74,ii 



48,oo 



8,99 



6,oo 



1,12 



84,oo 





533,76 



6. Sulphocyanate R(CNS) 2 is easily prepared by double decomposition of the ni- 

 trate of the base with sulphocyanate of potassium. On the solutions being concen- 

 trated the sulphocyanate is thrown clown in the form of thin and brilliant, sometimes 

 iridescent hexagonal leaves, rhombical scales or plate prisms. 



The sulphocyanate is very soluble in hot water and recrystallises on the cooling 

 of the solution. Its colour is clear golden-yellow. In solution it is not so easily decom- 

 posed by boiling as the isorneric sulphocyanate of platosemidiammine. Muriatic acid 

 does not precipitate the chloride of platosammine from the solution. Nitromuriatic 

 acid, when boiled with the compound, gives yellow qvadratic-octahedrons, beyond do- 

 ubt of the chloride of platinammine. I could not obtain any double sulphocyanate of 

 potassium, by dissolving the sulphocyanate in the solution of sulphocyanate of potas- 

 sium, but with mercuric sulphocyanate a compound is formed. Nitrate of silver gives 

 a brownish-yellowish precipitate containing silver and platinum (see in the following 

 N:o 7). The sulphocyanate may easily be prepared by boiling the chloride with a so- 

 lution of sulphocyanate of potassium. 



Analysis of the sulphocyanate dried at 100°: 



0, 4270 gr. gave 0,2410 gr. metallic platinum and 0,5785 gr. sulphate of barium 

 = 0,0794 gr. sulphur 



Found Calculated 



Platinum 56,44 197,88 56,88 



Sulphur 18,59 64,oo 18, 40 



Carbon 24, oo 



Nitrogen — 56, oo 



Hydrogen 6,00 



347,88 



The sulphocyanate was first prepared by Mr Buckton *) by boiling the chloride 

 of platosammine with sulphocyanate of potassium. He also asserts that the same com- 

 pound originates from the action of ammonia on plato- or platin-sulphocyanate. The 

 analysis of Buckton of this product gave the following result: 



') Buckton Quart. Journ. Ch. Soc. 7 p. 36, 1854. 



