TRANSACTIONS OF SECTION B, 



609 



The tetra-methyl bases exhibit some other peculiaritips. As far ns tlie 

 melting-points of their formyl and acetyl derivatives are indications, they would 

 appear to be composed of two xylidines less the melting-point of formo-anilide 

 (46°). 



Thus ; 

 1. 



Formyl 

 derivative 



NPICIIO 

 CH^ -^ ^ CHj composed of 



CH, 



CH, 



M.r. [163°] 



NHCHO 



CHg CH, 



CH.. CH. 



NHCIIO 



[104°-5] 

 104-5 +104-5 -46 = 163°. 

 NHCHO 



4 2 



[104°-5] 



NHCHO 



NHCH 



CH., 



Formyl 

 derivative 



/ >CH„ composed oi GYi.,'^ \gVI^ < \ 



CH,, 



M.P. [183°] 



164 + 65-46 = 183. 



NHCHO 



Formyl 

 derivative 



CH, 



CHg composed of 



V 



CH, 



4 2 



3 



[164°] 



HCHO 



CH, 



CH, 



4 2 



\^ 



CH, 



[e5°] 



NHCHO 



/\ 



CH, 



CH, 



CH, 



M.P. [144°] [113-5] 



113-5 + 76-5-46 = 144. 



[76-5] 



CH, 



The foregoing are merely a few examples. A much more extended list and 

 an attempt at a discussion of these relations we hope to give shortly. 



7, The Existence of Certain Semiearhazides in more than one Modification. 



By George Young, Ph.D. 



In 1887 Michaelis and Schmidt made benzoylphenylsemicarbazide by the 

 addition of cyanic acid to as-benzoylphenylhydrazine 



OcH5.N.NHj + HCNO = CuH..N.NH.CO.NH., 



I I 



CO.C.H, CO.C.H, 



and found the product to melt at 202-203°. Six years later (1893; "Widman 

 obtained benzoylphenylsemicarbazide by boiling phenylsemicarbazide, suspended 



