400 



The Philippine Journal of Science 



1918 



more persistence than that given by the alcohol solution, and 

 appear at lower concentration. Both solutions show a purple 



Oscillation frequency. 

 3000 31 34 36 38 4000 42 44 



3.8 



3.6 



_. 3.4 



3.Z 



3.0 



2.8 



E 2.6 



c 



I 2.4 



■5 2:2 



2.0 



A 8 



/.6 



/A 



2.1 l\ 



Fig. 1. Curve 1. Phthalic acid in alcohol. Curve 2. Phthalic acid in sulphuric acid. 



fluorescence under the iron-nickel arc, that noticed with alcohol 

 being rather faint compared to the decided color emitted by 

 the sulphuric acid solution. 



