DESTRUCTIVE DISTILLATION OF ANIMAL SUBSTANCES. 473 



heavier than water, and insoluble in acids, — the solution contained hydrohromate 

 of petinine. From the analogy of the other volatile bases, we should expect this 

 to be tribromopetinine, C, H; Br.3 N. My material being exhausted, I was not able 

 to extend these observations fiu-ther. 



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 readUy 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-yeUow needles, analogous in all its properties to that of 

 picoline. This identity was confirmed by analysis, which gave the following 

 results : 



r 5-648 grains of picoline from bone-oU gave 

 \ 15'990 ... carbonic acid, and 

 ^ 3-998 ... water. 



Carbon, .... 



Hydrogen 



Nitrogen, .... 



100-00 100-00 1162-5 



For stiU further security, a determination of the platinum in its double salt 

 with the chloride was made : 



(12-784 grains of chloride of platinmn and picoHae gave 

 4-204 ... 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 Unveb- 

 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 wUl 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 



