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VI.—On Some New Bases of the Leucoline Series. Part Il. By 
G. Carr Rostnson, F.R.S.E., and W. L. Goopwin. 
(Read 19th May 1879.) 
In a former paper read before the Society, and published in the Society’s 
“ Transactions,”* on “Some New Bases of the C,H,,4,N series,” obtained 
from the “ vitriol-tar,” from the distillation of shale, evidence was given of the 
isolation of three bases of this series, in addition to the Leucoline, Iridoline, and 
Cryptidine of G. WILLIAMS. 
In this paper it was pointed out that the three new bases, C,.H,;N, C,;H,N, 
and C,,H,,N, were obtained by the fractional distillation of the mixed bases 
after treating alternately with caustic soda and sulphuric acid. In the first 
experiment, in which a comparatively small quantity of material was used, and 
where fractional distillation was continued to twenty-five times, the presence of 
these bases was indicated by the analysis of their chloroplatinates, in those 
| fractions which from theoretic considerations might be expected to contain 
_ them; ¢g., Cryptidine, the last of G. WILLIAMS’ series, was found by him to 
have a boiling-point of 274° C., whilst Iridoline and Leucoline had boiling- 
| points of 256° C. and 238° C. respectively, showing a difference of 18° C. for each 
_ addition of CH, to the molecule. The next member in ascending the series 
| would be expected to lie in fraction 290°-295° C., its theoretic boiling-point being 
| 292°C.; accordingly, analysis of chloroplatinate from fraction 290°-295°C. showed 
26:12 per cent. of platinum, corresponding with percentage of platinum required 
for chloroplatinate of new base C,,H,,N.t+ 
| The quantity of bases in this first experiment being much too small to allow 
of any satisfactory examination of their fractions, a second and larger quantity 
| was, after going through the same processes of purification, submitted to 
| fractional distillation, and the corresponding fractions 290°-295°, 310°-815°, &c., 
examined. Here a curious anomaly in the boiling-points was observed : the 
three bases C,,H,;N, C,;H,,N, and C,.H,,N, were obtained ; but each was found 
in the fraction one step lower than was anticipated, 7.¢, in fractions 270°-275°, 
290°~295°, 310°-315° respectively, instead of in fractions 290°-295°, 310°-315", 
and 325°-330°. The explanation offered was that in the first experiment twenty- 
* “Transactions Royal Society, Edinburgh,” vol. xxviii. part ii, “On Some New Bases of the 
Leucoline Series.” 
+ Trans. Royal Soc. Edin., vol. xxviii. pt. ii, page 563. 
VOL, XXIX, PART I, oN 
