156 



REPORT — 1903. 



PiPERONYLic Acid. 

 C6H3(CH,0„)CO,H. M.P. 225°. 



Solution in Alcohol, 

 (Fig. 13.) 



Thickness of 



layer in 

 millimetreB 



Description of spectrum 



1 

 A 



25,20,15andl0 

 5 



5 and 4 



3 



2 and 1 



1 milligravi-molecule in 500 c.c 



Spectrum continuous to 



•) » 



Lines at . . . 



Spectrum continuous to 

 Lines at ... 



Spectrum continuous to 

 \st Absorption hand 

 Weak spectrum from 3520 to 

 2nd Absorption hand 

 Weak spectrum from 4102 to 

 Spectrum continuous to 

 \st Absorption band 

 Weak spectrum from 3471 to 

 2nd Absorption band 

 Weak spectrum from 4098 to 

 Spectrum continuous to 

 Weak in position of 1st absorption band. 

 Very weak in position of 2nd absorption 

 band. 



1 milligram-molecule in 2'500 c.c 

 Spectrum continuous to . . . 

 Weak in position of 1st absorption band 

 .. <i 2nd „ „ 



Continuous to 



Still weak in position of absorption band. 

 Spectrum practically continuous. 



4402 



4402 



2272 



2272 



