INTIMATE STRUCTURE ON COOLING. 



85 



With regard to the reversing region at 185, it can be stated that 



(1) The majority of the fluorescence series reverse in the seventh 

 group. 



(2) 36 out of 38 fluorescence series are joined in the seventh group 

 to absorption series. 



(3) The exactness of reversal depends not only on the structure of 

 the band, but on the simultaneous presence of fluorescence and absorp- 

 tion in this region. 



(4) Other reversals and connections are present in the groups adja- 

 cent to group 7. 



TABLE 30. Frequencies and intervals of fluorescence series at -\-20 C. 



