824 



Mr. Gr. H. Livens on Rotational 



Moreover, this general formula would appear to include 

 most of the results which have not yet been expressed by an 

 empirical relation. This is perhaps best seen by plotting a 

 graph of the function and comparing it with that given as 

 fig. 1. As, however, the curve may have various dispositions 

 with regard to the axes and only a portion of it in each case 

 corresponds to a real experimental region, I have drawn 

 four possible cases, in one of them only completing the curve 

 beyond the experimentally attainable region by a dotted 

 line. 









Fig 



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It would thus appear that the more correct form of equa- 

 tion representing the empirical relation between the quan- 

 tities involved is the formula (iii.) which results from our 

 theoretical investigation. 



Such a discussion, short as it is, provides almost convincing 

 proof of the appropriateness of our theory; but there are 

 certain facts which detract from its completeness. There are 

 a few substances whose behaviour is quite contradictory to 



