234 



C 4 H 



Diethylamine C 4 H 5 >N = 4 volumes. 

 H 



Triethylamine C 4 H 5 >N = 4 volumes. 

 C.H.J 



In a similar manner we find that glycol, the diatomic alcohol of 

 ethylene, the discovery of which we owe to the remarkable labours of 

 M. Wurtz, gives rise to three diatomic bases, corresponding to 2 

 molecules of ammonia, and representing likewise 4 volumes of vapour. 



(C 4 H 4 )^ 

 Ethvlene-diamine H 2 v\ =4 volumes. 



H 2 v\ 

 H 2 J 



Diethylene-diamine (C 4 H.)" VN =4 volumes. 

 H 2 J 



(C 4 H 4 )' r \ 



Triethylene-diamine (C 4 H 4 )" >N 2 =4 volumes. 

 (C,HJJ 



The two first terms of this series are the bases which M. Cloe'z 

 discovered about six years ago, but the true nature of which he failed 

 to recognize. To complete the series, it remains only to examine 

 the third volatile base and the oxide of tetrethylene-diammonium. 



The observations which I have the honour of submitting to the 

 Royal Society coincide in every point with the first note upon this 

 subject which I presented nearly two years ago. I have simply 

 carried out somewhat more in detail the sketch traced in my former 

 communication. 



In conclusion I may state a fact which has also been observed 

 by M. Cloe'z, viz. that the action of dibromide of ethylene upon 

 ammonia gives rise to the formation of bases not directly belonging 

 to the series which we have discussed. In searching for the method 

 of purifying the ethylene bases, I have been obliged to examine also 

 the terms of the other group ; but since these substances do not 

 necessarily belong to this part of the inquiry, I omit for the present 

 to enter more fully into their examination. 



