56 



The Philippine Journal of Science 



I»16 



compound and saturate the free affinities of the nitrogen atom 

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Fia 1. Curve I. Diethylsuecinosuccinate in aleohoL Light yellow modification. Curve II. 

 DiethyUuccinoeuccinate in alcohol. Deep yellow modification. CMrve III. Dietbylsocclno- 

 suijcinaie in alcohol plus 2 equivalents of sodium ethylate. Light yellow modification. 

 C«ri-« IV. Diethylsuecinosuccinate in alcohol plus 2 equivalents of sodium ethylate. Deep 

 yellow modification. Curt-e V. DiacetyldiethyUuccinosuccinate in alcohol. 



The absorption curves of methyl salicylate in neutral alcohol 

 and in the presence of a great excess of sodium ethoxide and 

 of the acetyl derivative of methylsalicylate are plotted in fig. 3. 



