138 Royal Societij : — 



(precipitate No. 3). The platinum found in the three precipitates 

 was 



No. 1. No. 2. No. 3. 



39"2 per cent. 3.r5 per cent. 35*4 per cent. 



The chloroplatinate of ethylamiue contains 39"3 per cent., and of 

 diethylamine 353 per cent, platinum. A platinum-salt made with 

 chloride insoluble in absolute alcohol, gave 44*2 per cent, platinum, 

 which is exactlj^ the amount contained in the chloroplatinate of 

 ammonia. 



The reaction was as follows : — 



p TT 1 C H ^ 



CrHHN + II.0„ + N0,H0=c!H3 I N + C„H,0., + NO,HO; 



c.hJ ■ ■ hJ 



C| hH N + H^O^ + NO5 H0= ' H I N + C, H„ O^ + NO^ HO ; 



hJ ■ hJ 



and 

 P FT 1 TT ^ 



'h In+H20.,+no,ho=h In+c,h„o.,+no,ho. 



As in the case of amylaniline, the phenylic alcohol and the alcohol 

 are converted into nitrophenasic acid and nitrite of ethyle ; the am- 

 monia being in both cases partially oxidized. 



5. Action of Binoxide of Manganese and Sulphuric Acid on Aniline. 

 Aniline was dissolved in an excess of dilute sulphuric acid (1 part 

 of acid to 6 of water) and heated to boiling, when a small quantity 

 of binoxide of manganese was added. The reaction was allowed to 

 continue for 3 or 4 minutes, and it was stopped by cooling the flask 

 in water. Potash was then added, and the solution filtered. The 

 filtrate was distilled as described in experiment 2, and the distillate 

 evaporated to dryness with hydrochloric acid, and extracted with ab- 

 solute alcohol, to dissolve any chloride of aniline present. A plati- 

 num-salt made from the chloride, insoluble in absolute alcohol, gave 

 44"0 per cent, platinum, which corresponds to the platinum in the 

 chloroplatinate of ammonia. 



6. Action of Binoxide of Manganese and Sulphuric Acid on 

 Biethyl aniline. 

 Diethylaniline was treated in the same manner as aniline, but only 

 for about one minute. Potash was added, &c., as in the foregoing 

 experiment. The platinum-salt partially precipitated, as in Ex- 

 periment 4, from the chloride soluble in absolute alcohol, gave : — 

 Precipitate No. 1. Precipitate No. 2. 



37*6 per cent, 35*4 per cent, platinum. 



No. 1 appears to be only a mixture of the chloroplatinates of 

 ethylamiue and diethylamine ; the quantity of salt first precipitated 

 being too small to be properly recrystallized (on account of former 

 experiments showing that the quantity of ethylamiue present was 

 very small). No. 2 corresponds with diethylamine, and of this salt 



