By taking the wavelengths of the absorption bands of anthracene in
benzene, methyl alcohol, hexane, toluene and chlorobenzenc and those of phenanthrene in
Benzene and methyl alcohol as giving the exciting frequencies the differences between these
and the frequencies of the fluorescent bands have been calculated. These have been found to
agree well with most of the Raman frequencies of the solvents. Some shift observed in the
present case which do not agree with any known Raman shift have been shown to he capable
of being built up by the combinations of Raman shifts observed by the present or other
authors
