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XIIL.— On the Products of the Destructive Distillation of Animal Substances. 
Part II. By Twomas AnpErson, M.D., Regius Professor of Chemistry in 
the University of Glasgow. 
(Read 17th April 1854.) 
In the preceding parts of the investigation of the products obtained by the 
destructive distillation of animal substances, I have entered fully into the method 
of treating the raw material, and have shown the existence in it of not less than 
three different series of bases; one, that of which methylamine is the type; a 
second, of which picoline is an example; and a third series, not yet further exa- 
mined, to which the provisional name of pyrol bases has been applied. Besides 
these, aniline is also met with, but whether as an isolated substance or accompa- 
nied by the other members of its series, cannot be determined, as none of them 
possess sufficiently distinctive reactions to permit their detection in a complex 
mixture. 
To the series of which picoline is a member my attention has hitherto been 
specially directed, and chiefly owing to the interest attaching to these bases from 
their identity in composition with the corresponding members of the aniline series, 
aniline and picoline being the first instance in which the isomerism of two organic 
bases, of which we have now so many examples, was distinctly made out. In 
the second part of the investigation, three members of the series in question are 
described, namely— 
Pyridine, Crapte NT 
Picoline, i ; F : ; C,, H, N 
Lutidine, z ; : ; ; C,, H, N 
of which the two latter are isomeric with aniline and toluidine. It was further 
remarked, that the phenomena observed seemed to indicate that the members of 
this series present in Dippel’s oil, did not terminate with lutidine, but that bases 
of higher atomic weight and boiling point manifestly existed in it. The object of 
the present paper is to show that this statement was well founded, by giving a 
description of another member of the series, and further to define their true con- 
stitution. 
On pursuing the distillation of the different fractions of basic products obtained 
by the process described in the second part of this investigation, and distilling at 
temperatures above 305°, which is about the boiling point of lutidine, it was found 
that, when converted into platinum salts, the percentage of platinum gradually 
diminished as the boiling point rose. Taking advantage of the well-known empirical 
VOL. XXI. PART I. 3.N 
