844 EEPORT— 1898. 



and its methylated derivative, 



are white substances, having no colourint^ power at all. 



If we introduce in the latter one amido-group, or better, a di-methylated 

 amido-group, N(CH3)2, we obtain a slightly yellowish substance 



^C,H,N(CH3), 

 C = N-C,H, 



dyeing wool, silk, and cotton previously mordanted with tannin in light 

 jellowish shades. 



If another amido-group or di-methylated amido-group is introduced, we obtain 

 a real, strong colouring matter, dyeing the above-named fibres in bright yellow. 



These substances 



yC,H,N(CH3), yC,H,N(CH3), 



C = N-C,H,NH„ ^ , C = N-CeH,N(CH3)„ 



may be easily prepared by acting on dimethyl-amido-benzo-metbyl-anilide 



C,H,N(CH3), 



I 

 CO 



I 



with para-phenylene-diamine or dimethyl- para-phenylene-diamine in tbe presence 

 of oxychloride of phosphorus. 



Benzenyl-diphenyl-methyl-amidine 



<_>-C = N-<_> 



'CH3 



may therefore be considered as a chromogen, similar to azo- benzene 



<— >-N = N-<— > 



Both, by the introduction of amido-groups, become real dye-stuffs, but whilst 

 azo-benzene itself is coloured, the amidine is colourless in itself, like anthra- 

 quinone and other similar chromogens. 



3. The Oxidation 0/ Glycerol in presence 0/ Ferrous Iron. ^1/ Henry 

 J. HoRSTJiAN Fenton, M.A., and Henry Jackson, B.A., B.Hc. Land. 



The peculiar iutiueuce which ferrous iron exercises upon the oxidation of 

 tartaric acid, and some other hydroxy-acids, which has been pointed out by one 

 of the authors in several previous couiiuunications, is now being investigated as 

 regards various classes of hydroxy-compounds. Mr. C. F. Cross, with the consent 

 of the authors, has subsequently applied this reaction to his studies on certain 



