254 PROCEEDINGS OF THE AMERICAN ACADEMY 



0.3020 grm. of the salt gave 0.0755 grm. of Pt. 



Calculated for (CjHsBrNHjjj.PtClg. Found. 



Platinum 25.16 25.00 



It crystallizes in orange-brown plates, apparently of the monoclinic 

 system, grouped in forms like frost, and is but slightly soluble in cold 

 water, more so in hot, and in alcohol. 



The secondary amine (CgH4BrCH2)2NH is left on evaporating its 

 alcoholic solution as an oil, which solidifies on stirring, and can be 

 obtained crystallized. It melts at 50°, and is very freely soluble in 

 alcohol and ether. 



The chloride is obtained in glistening rhombic scales, often pen- 

 nately twinned, by adding strong hydrochloric acid to an alcoholic 

 solution of the base ; it melts at 283°, and is nearly insoluble in cold, 

 somewhat more soluble in hot water, or alcohol, insoluble in ether. 



The chhrplatinate [(CeH^BrCH.OaNryoPtCl, formed by adding 

 chlorplatinic acid to an alcoholic solution of the free base, after being 

 washed with alcohol, and dried at 100°, gave the following result on 

 analysis : — 



0.4716 grm. of salt gave 0.0802 grm. of Pt. 



Calculated for [(CTHeBrjjNHjloPtClg Found. 



Platinum 17.58 17.01 



It is a yellow powder, nearly insoluble in alcohol and water. 



The tertiary amine (CgH^BrCH2)8N was purified by recrystalliza- 

 tion from ether, or from ligroin ; in either case a matted mass of 

 needles looking like cotton was obtained, but the melting-jjoint differed 

 according to the solvent used, the crystals from ligroin showing the 

 constant melting-point 92°, those from common ether the constant 

 melting-point 76°-78°. Two recrystallizations from ligroin were 

 enough to raise the melting-point of the crystals from ether to 92°, 

 while the same number from ether lowered it again to 76°-78°. The 

 following analyses, however, prove that the substance dried in vacuo 

 has the composition of the tertiary amine, whichever solvent was used 

 in its purification. 



I. 0.3800 grm. of the crystals from ligroin, m.pt. 92°, gave 0.6680 

 grm. CO2 and 0.1200 grm. 11,0. 

 II. 0.2515 grm. of the crystals from ether gave 0.4430 grm. COj and 

 0.0890 grm. H^O. 



0.2020 grm. of the crystals from ether gave 0.2175 grm. AgBr. 

 0.1888 grm. gave 0.2022 grm. AgBr. 



