INTIMATE STRUCTURE ON COOLING. 



75 



(2) The remaining bands listed in table 25 are not reversals of 

 fluorescence. They belong to existent absorption series, of which they 

 are the members of greatest wave-length as yet observed. 



It should be noted that special precautions were taken to avoid 

 bias. They were not sought for by locating the fluorescence bands and 

 looking for reversals, but found under conditions of illumination which 



TABLE 26. New absorption bands at 185 C. 



rigorously excluded fluorescence, and in many instances their existence 

 and place was checked by two observers working independently. 



The fact that practically the entire group was in approximate coin- 

 cidence with fluorescence was an unlooked for result of which we became 

 aware only after the measurements had subsequently been plotted. 

 The expectation was that these bands would prove to be members of 

 the absorption series lying farther toward the violet. 



