280 



compound, while the iodide of the diethylated diammonium is 

 reproduced, 



J + 6[(C 2 H 5 )I]=2 



(C 2 H 5 ) 2 



(C 2 H 5 ) 2 



_(C 2 H 5 )H 



Treatment of these mixed iodides with oxide of silver yields an 

 alkaline solution containing the three bases 



[(R 2 )(C 2 H,) 8 HN 2 ]''J 02 . 



the two former of which, being capable of conversion into the volatile 

 diamines 



and 



(C 2 H 6 ) 2 N 2 



(C 2 H 5 ) 2 N 2 , 



( C 2 H s 



may be expelled from the solution by a current of steam, the non- 

 volatile pentethylated diammonium-compound being left behind. 



Treated again with iodide of ethyl, the pentethylated compound, 

 lastly, is converted into the di-iodide of the hexethylated diammo- 

 nium. The formation of the pentethylated derivative establishes 

 the diatomic character of the ammonia under examination. 



I have studied several non-volatile bases, retaining one equivalent 

 of unreplaced hydrogen. The derivatives of the ethylene-ammonias 

 deserve more particularly to be mentioned. Ethylene-diamine and 

 diethylene-diamine, when submitted to the action of iodide of ethyl, 

 give rise to the following series of compounds : 



[(C 2 H 4 )" H e NJ"I 2 



[<C, HJ (C, H,) 2 H 4 N 2 ] I 2 [(C, H 4 ) 2 H 4 NJ I 2 . 



[<C, HJ" (C, H,). H 2 NJ I 2 [(C, H 4 ) 2 (C, H s ) 2 H 2 N 2 ] I 2 



[(C 2 H 4 )(C 2 H S ) 6 N 2 ]"I 2 [(C 2 H 4 ) 2 ''(C 2 H 5 ) 4 NJ'I, 

 The diatomic nature of ethylene-diamine and diethylene-diamine is 



