283 



A glance at the formula shows that it represents in the ethyl-series 

 the body which in the phenyl-series I had previously formed by the 

 action of tetrachloride of carbon on aniline. I have pointed out that 

 the latter may be referred either to two or to three molecules of am- 

 monia, and presents itself respectively as cyantriphenyl-diamine or as 

 carbotriphenyltriamine, 



C 19 H 17 N 3 = (C N) (C 8 H 5 ) 3 H 2 }N 2 =C* (C 6 H 5 ) 3 HJN 3 . 



In a similar, manner the new ethylated compound maybe regarded 

 as cyantriethyl-diamine or carbotriethyltriamine, 



C 7 H 17 N 3 = (CN)(C 2 H 5 ) 3 H 2 }N 2 =C^(C 2 H 6 ) 3 HJN 3 . 



The latter formula would illustrate in some measure how the 

 three ammonia-molecules are linked together in these compounds. 



Whatever view may be taken of these bodies, whether they be re- 

 garded as diamines or triamines, they claim some interest on account 

 of their well-defined characters and the numerous processes in which 

 they appear to be formed. 



Methyluramine, the base discovered by M. Dessaignes among the 

 products of oxidation of creatine, belongs to the same group of bases, 

 and perhaps the most interesting term of the series, guanidine, has 

 been lately obtained by M. Strecker by the action of oxidizing agents 

 upon guanine. Referred to three molecules of ammonia, the several 

 bases which I have mentioned are represented by the following 

 formulae : 



C iv 1 

 Carbotriamine (Guanidine) f N 3 . 



Methylcarbotriamine (Me- /-^T 

 thyluramine) ........ 



C iv 



Triphenylcarbotriamine (C 6 H.) 3 N 3 . 

 H 



Triethylcarbotriamine. . (C 2 H 5 ) 3 N 8 . 

 H 2 J 



The perfect analogy of these several compounds is beautifully 



