260 Dr. Simpson 07i a New Base obtained by 



purity, by mixing cold concentrated solutions of the organic salt 

 and of biclilonde of platinum. A bright orange-yellow precipi- 

 tate soon separates, which must be well washed with absolute 

 alcohol, in which it is almost insoluble, in order to remove the 

 excess of bichloride. Specimens of the salt prepared at different 

 times, and dried at 100° C, gave on analysis the following 

 numbers : — 



I. 0'5946 grm. of salt gave 0'3430 grm. carbonic acid and 

 0-1253 water. 



II. 0"3611 grm. of salt gave 0'0771 grm. platinum. 



III. 0*3620 grm. of salt gave 0'0766 grm. platinum. 



IV. 0-2243 grm, of salt gave 0-04'72 grm. platinum. 

 These numbers agi-ee perfectly with the formula 



rC«H4Br^ 

 N<^ C^H^Br kHCl + PtCP, 



as will be seen from the following per-centage Table : — 



Theory. Experiment. 



, ^ --, I. II. III. IV. 



13 equivs. Carbon . 72-00 15-6115-73 

 10 „ Hydrogen 10-00 2-17 2-34 



1 „ Nitrogen. 14-00 303 

 3 „ Chlorine. 106-50 23-10 



2 „ Bromine . 160-00 34-69 



1 „ Platinum. 98-70 21-40 ... 21-35 21-16 21-05 



461-2 100-00 



Formation of Dibromallylummonia. 



When dilute potash is added to a solution of the hydrochlo- 

 rate of dibi'omallylammonia, its base is set free, and precipitates 

 after some time in the form of a heavy oil. This body I sub- 

 mitted to analysis, having previously washed it with water to 

 remove adhering potash, and dried it in vacuo over sulphuric 

 acid. It cannot be distilled without decomposition. The ana- 

 lysis gave the following results : — 



I. 0-3432 grm. of base gave 0-3642 grm. carbonic acid and 

 0-1174 water. 



II. 0-3588 grm. of base gave 0-3815 grm. carbonic acid and 

 0-1078 water. 



III. 0-3200 grm. of base gave 0-3430 grm. carbonic acid and 

 0-1114 water. 



rC^H^Br] 

 These numbers correspond with the formula N-| C*'"H''Br >, 



L H J 



