236 PROCEEDINGS OF THE AMERICAN ACADEMY. 



pliatc decomposed b\ the addition of a Btrong solution ofsodic hydrate, 

 which Bel free the base as a pasty mass solidifying on cooling. This 

 base, after purification by crystallization from alcohol, Bbowed the con- 

 stant melting point 50 , which is that of the diparabrombenzylamine * 



I l,I'.r( II _. i MI. For greater security the chlorplatinate was pre- 

 pared and analyzed. Chlorplatinic acid added to an alcoholic solution of 

 tin- Iiase gave a yellow precipitate, which was purified by washing with 



alcohol, and dried in mcuu. 



0.1783 gram of the salt gave on ignition 0.0309 gram of platinum. 



Calculated lor | (i Jill r MI : ..I'M,'!,, Found. 



Platinum 17.08 17.34 



The sulphuric acid filtrate from the crystals of the diparabrombenzyl- 

 amine sulphate was treated at first with sodic carbonate, and finally with 

 a large excess ofsodic hydrate, and distilled with steam, the distillate 

 being collected in a series of flasks containing hydrochloric acid. After 

 the distillation was finished, the contents of the t!a>ks were evaporated to 

 dryness on the steam bath, and the white residue dissolved in a little water 

 and converted into the chlorplatinate ; this was a yellow precipitate 

 crystallizing in OCtahedra, which was washed with water and alcohol, 

 dried in vacuo, and analyzed with the following result-,: — 



0.2061 gram of the chlorplatinate gave on ignition 0.0U03 gram of 

 platinum. 



Calculated for (NII 4 ) 3 PtCl«. Fouud. 



Platinum 43.91 43.81 



It is evident from the experiment described above that the products of 

 the decomposition of diparabromben/ylcyanainide, when boiled with di- 

 lute sulphuric acid, are carbonic dioxide, diparabrombenzylamine, and 

 ammonia. The reaction, therefore, runs as follows: — 



(C 6 H 4 BrCH 2 ) 2 NCN + 2II„0 = (C ( ,IIJ > ..(Ilj,NII + NH, + CO,. 

 * Jackson, These Proceedings, XVI 264. 



