DESTRUCTIVE DISTILLATION OF ANIMAL SUBSTANCES. 213 



Its platinum compound could not be obtained in a state fitted for analysis. 

 On boiling with hydrochloric acid, and adding platinic-chloride, a yellow precipi- 

 tate was obtained, which, in one experiment, gave 32-39 per cent, of platinum ; 

 and in another, in which the boiling was continued longer, 33 - 53 per cent, was 

 obtained. Dibromo-dipyridine requires 30"94, and dipyridine itself 34-68 ; so 

 that there can be little doubt that the latter has been regenerated. 



Oily Base. 



The oily base from which the dipyridine was deposited in crystals, has been 

 as yet but imperfectly examined. It was purified by redistillation and cooling, 

 by which it yielded a small additional quantity of dipyridine, and this was re- 

 peated as long as it gave crystals. The base so obtained is a rather thick, pale- 

 yellow oil, heavier than water, having a peculiar heavy smell, quite distinct from 

 that of pyridine. It is insoluble in water, but dissolves with great ease in alcohol 

 and ether. It boils at a high temperature, and if distilled rapidly, it undergoes 

 partial decomposition, yielding a small quantity of what appears to be a mixture 

 of several bases with pungent smell, and sparingly soluble in water. If, how- 

 ever, the distillation be carried on very cautiously at a temperature below its 

 boiling point, it passes over unchanged. It dissolves in acids and forms salts, 

 most of which, however, are uncrystallisable, and dry up into gummy masses. 

 It was prepared for analysis by drying over calcic-chloride, distilling and separat- 

 ing the first part of the distillate which might retain moisture. 



( 3420 gramme of the base gave 

 I. < 09605 ... carbonic acid. 

 I 0-2135 ... water. 







(• 03662 



gramme of the 



base gave 









II. 



{ 10140 



carbonic acid. 











[ 0-2300 



water. 













Exper 



X 



iment. 





Calculation. 











s 



Carbon, 





76-59 



7551 



75-94 



c 5 



60 



Hydrogen, 





6-94 



698 



633 



H 5 



5 



Nitrogen, . 





... 



... 



17-73 



N 



14 



100-00 79 



These results, it will be seen, correspond with those given by pyridine and di- 

 pyridine, and they are confirmed by the analysis of a platinum salt, prepared in 

 the usual way. 



f 0-2991 gramme of the platinum salt gave 

 ( 0-1015 ... platinum. 



This corresponds to 33-94, and calculation for the formula (C 5 H 5 NHCl) 2 PtCl 4 

 requires 34 68. It is obvious, therefore, that this is another polymer of the 

 vol. xxv. part i. 3 I 



