ILLUSTRATIONS 



TEXT FIGURES 



Fig. 1. Curve 1. Phthalic acid in alcohol. 



Curve 2. Phthalic acid in sulphuric acid. 



2. Curve 1. Phthalic anhydride in glacial acetic acid. 

 Curve 2. Phthalic anhydride in sulphuric acid. 



3. Curve 1. Maleic anhydride in glacial acetic acid. 

 Curve 2. Maleic anhydride in sulphuric acid. 



4. Curve 1. Phthalide in alcohol. 

 Curve 2. Phthalide in sulphuric acid. 



5. Curve 1. Phthalimide in alcohol. 

 Curve 2. Phthalimide in sulphuric acid. 



Curve 3. Phthalimide in alcohol -f 5 equivalents of sodium ethoxide. 



6. Curve 1. Phthalimidene in alcohol. 

 Curve 2. Phthalimidene in sulphuric acid. 



7. Curve 1. Nitrosophthalimidene in alcohol. 



Curve 2. Nitrosophthalimidene in alcohol + 1 equivalent of sodium 

 ethoxide. 



8. Curve 1. Benzylidene phthalide in alcohol. 

 Curve 2. Benzylidene phthalide in sulphuric acid. 



9. Curve 1. Cyanbenzylidene phthalide in alcohol. 

 Curve 2. Cyanbenzylidene phthalide in sulphuric acid. 



10. Curve 1. Phthalylacetic acid in glacial acetic acid. 

 Curve 2. Phthalylacetic acid in sulphuric acid. 



11. Curve 1. Diphthalyl in glacial acetic acid. 

 Curve 2. Diphthalyl in sulphuric acid. 



12. Curve 1. Phthalanil in alcohol. 

 Curve 2. Phthalanil in sulphuric acid. 



13. Curve 1. Phthalophenone in alcohol. 

 Curve 2. Phthalophenone in sulphuric acid. 



14. Curve 1. Phthalophenone anilide in alcohol. 

 Curve 2. Phthalophenone anilide in sulphuric acid. 



15. Curve 1. Yellow phthaloxime in alcohol. 

 Curve 2. Yellow phthaloxime in sulphuric acid. 



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