ILLUSTRATIONS 



TEXT FIGURES 



Fig. 1. Curve I. Diethylsuccinosuccinate in alcohol. Light yellow modi- 

 fication. 



Curve II, Diethylsuccinosuccinate in alcohol. Deep yellow modi- 

 fication. 



Curve III. Diethylsuccinosuccinate in alcohol plus 2 equivalents of 

 sodium ethylate. Light yellow modification. 



Curve IV. Diethylsuccinosuccinate in alcohol plus 2 equivalents of 

 sodium ethylate. Deep yellow modification. 



Curve V. Diacetyldiethylsuccinosuccinate in alcohol. 



2. Curve I. P-diimide of diethylsuccinosuccinate in alcohol. 



Curve II. P-diimide of diethylsuccinosuccinate in alcohol plus 2 

 equivalents of hydrochloric acid. 



3. Curve I. Methylsalicylate in alcohol. 



Curve II. Methylsalicylate in alcohol plus 500 equivalents of sodium 



ethylate. 

 Curve III. Acetylmethylsalicylate in alcohol. 



