126 SPECTROSCOPIC INVESTIGATIONS 



ations in chromophoric molecules which will have virtually no detect- 

 able effect upon the absorption spectrum of the substances in these 

 regions, the degree of confidence in identification by means of corre- 

 spondence between electronic spectra must be correspondingly lim- 

 ited. 



This general line of argument may be readily extended to identifica- 

 tions derived by correspondences between the spectra of substances 

 in the infrared region. 



