56 The Philippine Journal of Science ma 



It is to be noted that the curves for dianilinoquinone are 

 similar within the limits of the solvent in each case. The great- 

 est variation due to the solvent is found in azophenine. The 

 color band in phenol and in glacial acetic acid is much extended 

 toward the red, and the general absorption is greatly increased 

 over the curve shown in aniline. This condition is probably 

 due to the acid nature of the solvents, phenol and acetic acid. 

 The color bands of these three compounds are well defined in 

 each solvent, and clearly indicate quinoid structure, which 

 accords with the formulas assigned to them. 



