1006 Mr. G. H. Livens on a Theory of the 



Another important point to be noticed is that the effects 

 here described always accompany an absorption band of the 

 type specified. But we have already seen * how the position 

 of the absorption band of a substance varies not only as a 



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consequence of a variation in the state of aggregation of the 

 substance itself, but also as a result of mixing other sub- 

 stances with it. Thus variations in the conditions of the 

 rotating substances will result in a variation in the position 

 of the spectrum in which the above characteristics present 

 themselves. This may contain an explanation of the difficulty 



* Cf. Livens, ' Ueber die Veranderlichkeit von Absorptionsspektren/ 

 i., ii., iii. Phys. Zeitsch. xiv. (1913). 



