275 



If we endeavour to form an idea regarding the constitution of this 

 compound, it is obvious that it may be referred to four molecules of 



ammonia, 



(CDV' 



C 7 H 14 N 4 3 = (C 2 H 5 ) 2 

 H, 



when it presents itself as a tetramine, as a urea of a higher order, 

 and becomes in a measure analogous to some of the ureas of diatomic 

 bases lately studied by Dr. Volhard*, more especially to ethylene- 



diethyl-urea, 



(CO)/' 



C.H.N.O, - N t . 



The latter compound differs from the crystalline substance pro- 

 duced by the action of cyanate of ethyl on urea by the presence 

 of the diatomic molecule C 2 H 4 , in the place of the diatomic mole- 

 cule CO. 



The formula of the new compound represents also the ammonium- 

 salt of diethylcyanuric acid, 



(CN), 



Wl o, = (C : H.) 



The substance, however, is not an ammonium-salt proprement dit. 

 Acids separate no diethylcyanuric acid; the alkalies in the cold 

 evolve no ammonia ; dichloride of platinum produces no precipitate 

 in the aqueous solution. 



The mother-liquor, from which the new compound has been Tie- 

 posited, contains cyanurate of ethyl and ethyl-urea, the formation of 

 which substances requires no special explanation. 



XI. " Notes of Researches on the Poly-Ammonias/' No. XIII. 

 Derivatives of the Phenyl- Series. By A. W. HOFMANN, 

 LL.D., F.R.S. Received May 24, 1861. . 



Some years ago I pointed out the existence of a peculiar class of 



bases, which are formed by the union of the aromatic ammonias witlr 



cyanogen. Only two of these compounds, cyaniline and dicyan- 



melaniline, have as yet been more particularly examined. I have of 



* See previous notice. 



