DESTRUCTIVE DISTILLATION OF ANIMAL SUBSTANCES. 473 
heavier than water, and insoluble in acids,—the solution contained hydrobromate 
of petinine. From the analogy of the other volatile bases, we should expect this 
to be tribromopetinine, C,H, Br, N. My material being exhausted, I was not able 
to extend these observations further. 
Picoline. 
Having determined the properties of petinine, I next turned my attention to 
that portion of the mixed bases which boiled between 270° and 280°, where I had 
every reason to expect the presence of picoline. After several rectifications, in 
each of which the first and last portions of the product were separated, I obtained 
a fine colourless transparent oil, possessed of all the properties of that substance. 
It dissolved readily in water: gave, with chloride of gold, a fine yellow compound 
depositing in needles from the hot solution, and with bichloride of platinum, a salt 
crystallizing in orange-yellow needles, analogous in all its properties to that of 
picoline. This identity was confirmed by analysis, which gave the following 
results: 
5°648 grains of picoline from bone-oil gave 



15°990 ... carbonic acid, and 
3°998 ... water. 
Carbon Erie is wae TT ol 7741 Cre 900-0 
HHydroreny) ss. vt%) 7:86 7-53 H, 87:5 
Nitrogen, . . . . 14:98 15:06 N 1750 
100-00 100-00 1162°5 
For still further security, a determination of the platinum in its double salt 
with the chloride was made : 
{ 12-784 grains of chloride of platinum and picoline gave 
4204 .., platinum. 
This corresponds to 32°88 per cent., and the calculation gives 32:94. 
The suspicion, then, of the occurrence of picoline in the odorine of UNVER- 
DORBEN turns out to be perfectly correct; at the same time my experiments have 
clearly shewn, that odorine is a mixture of picoline, with at least one other base, 
the properties of which will be detailed in the second part of this investigation. The 
quantity of picoline contained in bone-oil is considerable, and it can be more readily 
prepared from that substance than from coal-tar naphtha; in fact, I obtained from 
three hundred pounds of bone-oil a larger quantity of picoline than that employed 
in my examination of it, which was obtained from some hundred gallons of coal- 
tar naphtha; and by means of it, I shall be enabled to trace out the products of 
its decomposition, which I was unable to pursue in my former communication 
