Hackett — The Tonic Theories of Magneto-o^ytic Rotation. 13 



number of ions per unit volume, 



charge carried by the silver ion in electrolysis, 

 number of such charges carried by the ion, 

 charge on the ion, 



9654 electro -magnetic units. Since this quantity of elec- 

 tricity deposits 108 gms. of silver or N atoms of silver 

 carrying charge e. 



Making these substitutions, we get 



Since all tenns in k are positive, k is certainly greater than any 

 one term ; and since 5/3 is greater than unity, provided we take the 

 proper molecular weight, we can immediately set down a lower limit 

 for the susceptibility in the case of carbon disulphide and creosote, 

 and in the more general case, the order of this lower limit, based 

 on deductions made from magnetic rotation, which will test the 

 correctness of the application of the hypothesis of rotating ions. The 

 actual values of the susceptibility are compared below with the lower 

 limit calculated : in this way we should have — 



kV= 9654 2 9654 



Substance. — 



9654 



kV ohs. 



Carbon disulphide, . 

 Creosote, 



Diamagnetic substances, 



3- 9 X 10-5 



4- 3 X 10-5 

 1-6 X 10-5 



37 X 10-- 

 41 X 10-2 

 1;') X 10-2 



72 X )0-G 

 84 X 10-6 

 100 X lO-*"' 



These numbers show that the lowest values for the susceptibility 

 which could exist on the basis of the present theory of magnetic 

 rotation is certainly 10,000 times too great. There is no necessity 

 to consider whether the actual molecule is represented by the 

 chemical formula or a multiple of it, and so cause yS, the number 

 of ions per chemical formula, to be less than unity. The difference is 

 far too great to be affected by considerations of this nature. Chemical 



