112 Messrs. A. H. Church and E. Owen on the Bases 



quantity was dissolved in water, hydrochloric acid added, and 

 then bichloride of platinum ; sufficient water to redissolve the 

 orange-yellow crystalline precipitate first formed was then 

 poured in and the mixture set aside to crystallize. Several crops 

 of magnificent orange-red shuttle-shaped crystals were suc- 

 cessively obtained, and these, after washing with alcohol and 

 ether, gave the following results on analysis : — 



I. 0*325 grm. gave 0*2432 grm. carbonic acid and 0*1414 

 grm. water. 



II. 0*2705 grm. gave 0*201 grm. carbonic acid and 0*119 

 grm. water. 



III. 0*3008 grm. gave 0*101 grm. platinum. 



IV. 0*409 grm. gave 0*1378 grm. platinum. 



V. 0*1925 grm. gave 0*0648 grm. platinum and 0*283 grm. 

 chloride of silver. 



These numbers correspond to the following per-centages : — 



Experiment. Theory, 



I. II. III. IV. V. C l0 H 14 NCl,PtCl 2 . 



Carbon 20*41 20*26 20*43 



Hydrogen 4*83 4*89 4*77 



Nitrogen . . . . . . . . . . 4*77 



Chlorine 36*36 36*29 



Platinum .. .. 33*57 33*69 33*66 33*74 * 



10000 

 The platinum salt analysed had therefore the composition of 

 that of amylamine ; our reasons for thinking it isomeric but not 

 identical with that substance, will be found below. We place 

 but little reliance upon any distinctions based upon the physical 

 characteristics only of the two salts, such characteristics being 

 singularly variable in the case of many platinum salts. A few 

 brilliant yellow spangles finally separated from the mother-liquor 

 of the cespitine platinum compound, and gave the following 

 result when burnt : — 



0*1786 grm. gave 0*0618 grm. platinum. 

 This corresponds to 34*60 per cent, of platinum, and agrees 

 with the per-centage of platinum in the pyridine double salt — 

 34*68. 



Our earliest determinations of platinum in the platinum salt 

 of the fraction 95° — 100°, gave the following numbers : — 

 I. 0*3121 grm. yielded 0*101 grm. platinum = 33*29 p. c. 



II. 0*4235 grm. yielded 0*1418 grm. platinum = 33*29 p. c. 

 On recrystallizing the remaining salt and igniting, the follow- 

 ing results were obtained : — 



III. 0*3115 grm. gave 0*1055 grm. platinum = 33*86 p. c. 



IV. 0*3173 grm. gave 0J085 grm. platinum = 34*19 p. c. 

 * 99 is the equivalent of platinum adopted in this memoir. 



