Certain New Derivatives in the Aromatic Series. 193 



molecule. The bromine-holding dyes had the following constitu- 

 tion : — 



Br 



Br< 



Br 



Br 



R' 



N =. X— 



SO.Na 



'\ / 



OH 



SOgNa 



Br 



/ 



Br 



G' 



-N = N— r 



S03Na 



SOgNa 



lOH 



The dyes, when compared with their commercial relatives, Pon- 

 ceau 2G and Orange Gr extra, have distinctly more orange hues. 



Many other dyes were made, but it is deemed unnecessary to 

 multiply instances. Some of this additional work may be men- 

 tioned however ; when the diazotized tri-brom-aniline was linked 

 with alpha-naphtol a brown-red was made ; alpha-naphtylamine 

 gave a red ; beta-naphtylamine a brick-red ; Bronner's gave a 

 black-red ; Dahl's a crimson ; tri-sulphouic acid of naphtol a bright 

 red, very soluble in water. 



School of Mines, Columbia College, March 15, 1894. 



