194 



M. J. A. Groshans on the 



value. In Table XVII. the constancy of x is given in the 

 case of the hydrazines, bodies resembling in formulae urea ; 

 and the hypothetical first member, N 2 H 4 , differs from that in 

 the ureas, CON 2 H 4 , by the group CO. 







Table XVII. 









Name. 



Formula. 



A. 



B. 



observed. 



X, 



found. 



X, 



theory. 



Hypothetical f 

 first member \ 



Phenyl hydra- f 

 zine \ 



Diethyl hy- f 

 drazine ... \ 



Phenylmethyl f 

 hydrazine... \ 



NH 2 

 NH 2 



NHC 6 H 5 

 NH 2 



NHC 2 H 5 

 NHC 2 H. 



NHC 9 H 5 

 NHCH 3 



| 32 

 ]l08 

 I 88 

 1 123 



10 

 20 



22 

 23 



233 



96-5 

 223 



11-36 

 11-10 

 11-13 



11 

 11 

 11 



Here, again, is the value of # = 11, as was the case in one 

 of the bodies in the last table*. 



Table XVIIL contains ethylene diamine, C 2 H 4 N 2 H4, and 

 its substitution-products, along with an analogous compound, 



Table XVIII. 

 Ethylene diamine and its substitution-products. 



Formula. 



a. 



B. 



S°, 

 observed. 



X, 



found. 



X, 



calculated. 



N 2 H 4 (C 2 H 4 ) 



60 



16 



117 



13-99 



14 



N a H 3 (C s H 4 ) 2 



86 



20 



170 



13-73 



14 



N,(C,H 4 ) 2 (C 2 H 5 )., 



142 



32 



185 



13-72 



14 



N 2 (C 2 H 4 ), 



112 



24 



210 



13-86 



14 



N 2 (C 2 H 4 ) 3 



103 



26 



208 



1907 



19 



* We find in the aromatic series bodies metauieric with those in 

 Table XVII. ; thus :— 



Metamers of C 6 H 8 N 2 . 



Three phenylene diamines, with the constants x respectively =12, 13, 14. 



Metamers of C 7 H 10 N a . 

 Three cresylene diamines, with x respectively 14, 13, and 14. 



