404 



The Philippine Journal of Science 



1913 



purple fluorescence, with two bands, one heading at - = 3400 



and a more persistent band at - = 4000 (fig. 4). 



The two preparations of phthalide showed no differences, and 

 were evidently identical. 



Oscillation frequency. 

 3000 32 34- 36 38 4000 42 44 



3.2 



3.0 



2.8 



^ 2.6 



Z.4 



2.2 



% 2.0 



m 



i \ i \ ^ 



j _^=-^_ 



1.6 



U 



Fig. 4. Curve 1. Phthalide in alcohol. Curve t. Phthalide in sulphuric acid. 

 PHTHALIMIDE 



c=o 

 c 6 h/ \th 

 c=o 



Phthalimide in alcohol shows a well-marked absorption band 

 heading at \= 3460 and incipient benzene bands (fig. 5). 



