SOME NEW BASES OF THE LEUCOLINE SERIES. 267 
were replaced by (NO,.), we should have from cryptidine the body 
2C,,H,,(NO.)NHCl, PtCl,, which requires 24°14 per cent. platinum. 
Similarly, the chloroplatinate from fraction 290°-295° showed 23°37 per cent. 
platinum, this being far too low for platinum salt of base C,,.H,,N, that salt 
requiring 26°12 per cent., the presence of a nitro-compound was inferred from 
the fact that the percentage of platinum obtained agreed closely with the 
calculated quantity for the body having the formula 2C,,H,.(NO,)NHCIl, PtCh, 
this body requiring 23°34 per cent. platinum, found 23°37 per cent. 
In order to more completely separate the bases five more fractional distilla- 
tions were made, this making twenty-five fractionations in all, and involving 
some six hundred distillations. 
Again a platinum salt was prepared from fraction 290°-295° by dissolving the 
base in nitric acid as on former occasions, this yieided 23°54 and 23°52 per cent. 
platinum, agreeing with the salt made after twenty fractionations, thus 
showing that the last five fractional distillations had not effected any further 
separation, and further strengthening the supposition that the bodies obtained 
by the action of nitric acid were nitro-compounds. The further examination of 
these bodies was not proceeded with at this stage, as we considered it more 
advisable to attempt the identification of the bases in the first instance without 
the use of nitric acid, employing only hydrochloric acid as the solvent. 
The method adopted for obtaining the chloroplatinates was therefore as 
follows :—About 3-5 grms. of the fraction under examination was dissolved in 
20-30 cc. of dilute hydrochloric acid and the solution boiled, when a small 
quantity of a black tarry substance separated; this was filtered off, and the 
clear solution, diluted with five to six times its volume of water, was cooled in 
freezing mixture. To the diluted solution was added platinum chloride, the 
chloroplatinate precipitated as a fine granular yellow mass was collected on a 
filter washed several times with ice-cold water, then with a mixture of alcohol 
and ether, dried over sulphuric acid, and finally dried at 100° C. 
Examination of Fraction 270°-275°. 
Chloroplatinate prepared as above, 
0:2805 germs. gave 
0:0765 ,, platinum = 27:27 per cent. 
This agrees with percentage of platinum demanded by chloroplatinate of 
cryptidine, bg. pt. 274° C., the formula for which 2C,,H,,NHCI, PtCl, requires 
27°13 per cent., this being sufficient evidence of the presence of cryptidine, and 
also indicating that this time the increased number of fractional distillations to 
which the bases had been subjected had brought them up to their hypothetical 
boiling-points, the carbon and hydrogen in this salt was not determined. 
