
SOME NEW BASES OF THE LEUCOLINE SERIES. 565 
from the methyl chloro-platinate of base C,,H,,N, the formula of which, 
2C,,H,,NCH;Cl, PtCl,, requires 23°5 per cent. platinum; whilst a’, giving 
24°63 per cent. platinum, approaches the percentage of platinum from the 
methyl chloro-platinate of base C,;H,;N, the formula of which, 2C,,;H,;,NCH;Cl , 
PtCl, , requires 24°32 per cent. of platinum. 
These results with methyl-iodide can of course be accepted as only giving 
a mere indication of the presence of these bases; but I hope to be able to 
extend this investigation when I can get a larger quantity of material to work 
on. 
The remainder of the fractions of the bases being so small as to render any 
satisfactory examination of them quite impossible, Messrs GELLATLY and THom- 
SoN again kindly supplied me with a further quantity of the mixed bases, which 
had been purified in the same manner as the first quantity. This second lot of 
bases was first distilled without a thermometer, then submitted to a rigorous 
fractional distillation: after twelve complete fractionations the fractions had 
become very fairly constant in their boiling points, and ranged from 260°-265° 
to 325°-330°. 
It being expected that the base C,,.H,;N, the first above cryptidine, would 
be found about the fraction 290°—295°, the fractions ranging from 285°-305° 
were submitted to four more complete fractionations, and the examination of 
these fractions was commenced. 
Examination of Fraction 290°-295°. 
About 5 grms. of this fraction was dissolved in ordinary nitric acid, and 
the solution evaporated on the water-bath ; the resinous mass, on digestion with 
cold water, yielded a yellow solution, whilst the tarry matter was insoluble, this 
was filtered off, the solution cooled down in freezing mixture, and platinum 
chloride added, when the chloro-platinate was precipitated in a fine granular 
_ condition, this was collected on a filter, washed with ice-cold water, then with 
_ alcohol and ether, dried over sulphuric acid, and finally dried at 100° C. 
GREVILLE WILLIAMS, “Trans. R.S.E.” vol. xxi, in preparing the chloro-plati- 
_ Mate of cryptidine, observed that on the addition of platinum chloride to the solu- 
tion of the base, an adhesive precipitate came down, which crystallised, from its 
solution in boiling water, in yellow needles. As already stated, the precipitate 
from the solution of the base, cooled in a freezing mixture, was granular, and, 
examined by the microscope, had the appearance of fine tufts of silky crystals ; 
but I completely failed to get crystals from the solution of the precipitate in 
boiling water, for as the solution cooled the chloro-platinate was deposited 
| on the sides of the vessel in sticky globules. 
VOL. XXVIII. PART II. 7G 
