SOME NEW BASES OF THE LEUCOLINE SERIES. 569 
Having now shown the presence of the three new bases— 
C,.Hy,N ? 
C,3Hy;N ? 
CO,,Hy,N ? 
in the fractions 270°—275°, 290°-295", and 310°-315° respectively, it remains to 
be seen how their existence in these particular fractions is to be reconciled 
with the accepted boiling points of the three first members of the series— 
Leucoline, ; : : C,H,N . B.Pt. 238° C. 
Tridoline, , ; ‘ Ci aN ayet 2bo°.€. 
Cryptidine, . , : Cie Nusbs. 2 ea, 
for it is evident that in such a series of homologous bodies, it would be an 
anomaly to have two members of the series with the same boiling point, as 
eryptidine, C,,H,,N, bg. pt. 274° C., and the first new base, C,,H,;N, from fraction 
270°-275°, apparently are, whilst the remainder conform with the recognised 
difference of 18° C. for each addition of CH,. 
The only explanation I can in the meantime offer is this : the first quantity 
of mixed bases worked upon was submitted to twenty-five complete fractiona- 
tions, the fractions ranging from 270°-315°—this represents about 225 distilla- 
tions ; whilst the second quantity of mixed bases underwent sixteen complete 
fractions. The difficulty of separating substances by the method of fractional 
distillation is well known, and this difficulty is increased by several important 
factors, ¢.g., high molecular weights, and consequently high boiling points ; and 
also by the constitution of the substances under examination, as, in this case, a 
series of homologous bases. 
I think, therefore, that had it been possible to continue the fractional dis- 
tillation of the second quantity of bases to as many as 25 or 30 fractionations, 
the three new bases would have been found in their hypothetical fractions 
290°-295°, 310°-215°, and 325°-330°, instead of in the fractions 270°-275’, 
290°-295°, and 310°-315° ; and this opinion is confirmed by the fact, that from 
the first quantity of bases where distillation had been pushed to twenty-jive frac- 
fionations, the fraction 290°-295° did yield a chloro-platinate, the percentage 
of platinum in which corresponds with the first new base, C,.H,,N, and though 
for want of chloro-platinate the carbon and hydrogen proportions could not be 
ascertained, still the two platinum results stated were obtained by the analysis 
of two chloro-platinates, prepared in the same manner, but independently of 
each other. 
Again, it is to be noted that the actual boiling points of the three new 
bases have not yet been attempted, but that merely in these three particular 
fractions such bases have been found. GREVILLE WILLIAMS, also ANDERSON, 
VOL. XXVIII. PART II. 7H 
