566 MR G. CARR ROBINSON ON 
Analysis of Chloro-Platinate from Fraction 290°-295°, dried at 100° C. 
I. 0:53825 grms. salt gave 
0°135 »  platmum = 25:08 per cent. platinum. 
Le 557 » salt gave 
01355 , platinum = 25:23 - 2 
TIE. 0°50475 ,, salt gave 
0°732 s Co, es Uy Me carbon. 
00-2085. .,, H,O = £57 3 hydrogen. 
EVe 0297 P salt gave 
04255 _—,, Co, = SPST ,, carbon. 
01238 sf H,O = 446 5 hydrogen. a 
1 1% II. IV. 
Carbon, ; I , 39°52 39°87 
Hydrogen, ‘ ‘ 4:57 4:46 “s 
Platinum, . 2 ; Za 96 25:08 25°23 
These analyses show that the fraction 290°-295° consists of the new base 
C,;H,;N, the chloro-platinate of which, 2C,;H,;NHCl, PtCl, , requires — 
Found. 
Carbon, : ; ; 39°89 39°52 39°87 
Hydrogen, . ‘ ; 4:09 4:57 4:46 
Platinum, . ‘ 25°19 25°08 25°23 
The base, too, is as pure as can well be obtained by fractional distillation; | 
and analysis of the fraction itself would not throw any light on it, as in this 
series of homologous bases, differmg by CH, , there is a difference of only 0-2 
in the carbon percentage for each carbon atom. 
The presence of the base C,;H,;N was entirely unexpected in this fraction; 
for cryptidine, C,,H,,N, boiling at 274° C., the next member of the series, C,H N, 
should be in fraction 290°-295°; and the base C,;H,;N would then come in at 
fraction 310°-315° ; 7.¢., taking 18° as the rise in boiling point for each addition 
of CH,. Thinking the thermometer employed in the fractional distillation might 
be at fault, the fraction 270°-275° was again distilled with another thermometer, 
but no error was here detected, the fraction still being very constant, only afew 
drops coming over either below or above its original boiling point 270°-275°; 
that portion of the fraction distilling between 270° and 275° was collected 
separately. 
~ 
Exanunation of Fraction 270°-275°. 
About 5 grms. of this fraction was dissolved in nitric acid, and a chloro- 

