
564 MR G. CARR ROBINSON ON 
Analysis of Chloro-Platinate, No. 2, from Fraction 290°-295°. 
0:54 grms. gave 
0141 ,, platinum = 26:11 per cent. platinum, 
agreeing with first analysis. 
it Il. Theory. 
Platinum, . : ; 26:11 26°11 26°12 
These two platinum determinations show that the fraction 290°-295°, obtained 
after twenty-five complete fractionations, consisted of the new base C,.H,,N ; 
but the whole of the chloro-platinate being used in these analyses, I am unable 
to give the carbon and hydrogen proportions. 
Treatment of Mixed Bases with Methyl-Iodide. 
As previously mentioned, before commencing the fractional distillation of 
the bases, some experiments were made with a view to separating them in the 
form of methyl-iodide compounds. For this purpose 100 grms. of the mixed 
bases were dissolved in 200 grms. of methyl-iodide; the solution was then 
digested on a water bath for 2 hours, in a flask of 2 litres capacity fitted with — 
an inverted condenser ; the excess of methyl-iodide distilled off and the semi- 
solid crystalline mass in the flask treated with absolute alcohol, to dissolve out 
unacted-on bases, and filtered ; the crystalline mass washed with cold water, 
dissolved in warm water, and the solution set aside to crystallise, from which 
three crops of crystals were obtained, those marked a’, a’, a’. . 
The first crop of crystals, a’, was washed, dissolved in water, and the solu- 
tion treated alternately with silver nitrate, dilute hydrochloric acid, and 
platinum chloride; the precipitated chloro-platinate of methyl-base, washed, 
and dried at 100°, gave on analysis— 
0543 grms. gave 
01255 ,, platinum = 23:11 per cent. platinum. 
From the second crop of crystals, a’, the chloro-platinate of methyl-base was 
prepared in same manner as a’, This gave on analysis— 
0:29325 grms. gave 
007225 ,, platinum = 24°63 per cent. platinum. 
The third crop of crystals, a®, had decomposed before it could be dried, so 
its examination was not proceeded with. 
From these two analyses it would seem that the base of highest molecular 
weight is precipitated first as methyl-iodide compound; for a, being the 
chloro-platinate of methyl-base from first crop of erystals of the iodide, 
gave 23°11 per cent. platinum, which approaches the percentage of platinum 
