107 



Dibromide of ethylene acts upon ethylamine even in the cold, the 

 products of the reaction varying according to the relative proportions 

 of the two bodies, and according to the temperature. Among other 

 products invariably occur the two bromides corresponding to the 

 two salts of the phenyl-compounds mentioned in the previous para- 

 graphs. 



These substances are the 



Dibromide of ] [""(^HJ"! 1 " 

 ethylene-diethyl- lC 12 H 18 N 2 Br 2 = (C 4 H 5 ) 2 \- N 2 Br 2 , and 

 diammonium, J H 



Dibromide of "} r(C 4 H 4 ) 2 "] 



diethylene-diethyl- ^C 16 H 22 N 2 Br 2 = (C 4 H 5 ) 2 [ N 2 Br 2 . 

 diammonium, J H 



I have fixed the composition of the former compound by the ana- 

 lysis of the dibromide of the dichloride and of the base itself, all of 

 which are remarkably well-defined crystalline bodies, and that of 

 the latter by the examination of a well-defined platinum-salt. 



The first base, separated by the action of anhydrous baryta from 

 the dry bromide, distils as an oily liquid of a powerfully ammoniacal 

 odour, which solidifies into a brittle crystalline mass not unlike 

 fused stearic acid. The composition of the body is remarkable. 

 It contains 



r<C.H,n 



C 12 H I8 N 2 2 = (C 4 H S ) 2 U 



H 4 J 



0, 



and thus constitutes the dioxide of the diatomic metal, ethylene- 

 dieth y 1- diamm onium . 



The second base is liquid, and boils at 185. It is easily obtained 

 from the dibromide, which, being extremely soluble, may be readily 

 separated from the bromide of the first body. I have experimentally 

 established that this body may be readily procured by the action of 

 dibromide of ethylene upon the dioxide previously mentioned. 



The dioxide, 



C J2 H W N 2 2 , 



presents considerable interest in a theoretical point of view. I have 

 determined the vapour-density of this compound by Gay-Lussac's 

 process. Experiment gave the number 2*26. Assuming that the 

 molecule of the body under examination corresponds to 4 volumes 

 of vapour, the theoretical density is 4 '62. 



