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SOME NEW BASES OF THE LEUCOLINE SERIES. 563 
Fractional Distillation of the Mixed Bases. 
The portion of the first distillate from the mixed bases, marked A, boiling 
between 305° and 320° C., was fractionated, and after twenty-five complete frac- 
tionations, the fractions being fairly constant, distillation was stopped. About 
one-third of original quantity now appeared below 270° C., one-third between 
270° and 280°, and the remainder in very small fractions ranging from 280° 
to 315°. 
The high boiling portion from the first distillate from mixed bases, boiling 
above 315°, marked B, was next fractionated, and the fractions which then 
came over below 315° added to the corresponding fractions of A. 
Examination of Fractions. 
Cryptidine, C,,H,,N, boiling 270°-275° (WILLIAMs), and the members of this 
series differing in their boiling points by 18° for each addition of CH, , the next 
base, C,,H,,N, would be expected to be found in fraction 290°-295°; so a 
portion of this fraction was dissolved in dilute hydrochloric acid, and the solu- 
tion boiled with a few drops of nitric acid, to separate tarry matter ; the filtered 
solution diluted further, cooled down in a freezing mixture, and platinum 
chloride added ; the precipitated chloro-platinate filtered off, washed with ice- 
cold water, then with alcohol and ether, and dried over sulphuric acid and 
finally at 100° C. 
Analysis of Chloro-Platinate from Fraction 290°-295°. 
0°2585 grms. gave 
0:0675 ,, platinum = 26:11 per cent. platinum. 
This agrees with the percentage of platinum demanded by the chloro-platinate 
of the new base C,,H,,N, the formula 2C,,H,,NHCl1, PtCl, requiring 26°12 per 
cent. platinum. 
Another portion of this fraction, 290°-295°, was mixed with methyl-iodide 
and heated in a sealed tube in a water bath, and a small quantity of the methyl- 
_ base obtained, but this, whilst under process of conversion into platinum salt, 
| was lost by an accident. 
The remainder of the same fraction, reduced now to a few drops, was dis- 
. solved in dilute hydrochloric acid, and a chloro-platinate prepared as in the 
first case; the chloro-platinate was dried over sulphuric acid and finally at 
100° C, 
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