viii. a. 6 Pratt: Phthalides and Related Compounds 



411 



after boiling with bone black until finally obtained as colorless 

 plates. It melted at from 260° to 265° uncorrected, thus cor- 

 responding with the determination of Roser. 8 The solution in 



2.8 



2.6 



2.4 



2.2 



e 2.0 



/.8 



■g /.6 



/A 



/2 



28 



Oscillation frequency. 



30t 32 34 36 



38 4000 42 



1 2 



- 1 



/ 































































































































































, 



















Flo. 10. Curve 1. Phthalylacetic acid in glacial acetic acid. Curve 2. Phthalylacetic 

 acid in sulphuric acid. 



glacial acetic acid is colorless, and shows two bands heading at 

 \ = 3200 and 3660 (fig. 10). 



The sulphuric acid solution is light yellow, with faint purple 

 fluorescence under the arc, and is characterized by a well-marked 



band at - = 3040 with two small bands at - 



3750 and 4080. 



'Ibid. (1884), 17, pt. 2, 2619. 



