1123 



The defniito series is: liisimidi (Ji-apliiie Aiitiinonj Tellurium 

 Cadmium Zinc Silver Gold Cop[)er Lead. 



Hexagonal are : and regular : 



Bismuth Silver 



Graphite Gold 



Antimony Copper 



Tellurium Lead 



Cadmium 

 Zinc 

 The order of the diamagnetic susceptibilities is according to Morris 

 Owen ^) : x 



Bismuth — 1.40 X 10-^ 

 Graphite^) — 5 j 



Antimony — 0.815 [ 



m 11 • A oAo Hexagonal 



lellurium — 0.303 1 ^ 



Cadmium — 0.185 



Zinc — 0.151 



Silver — 0.201 



Gold — 0.152 



Lead — 0.120 



Copper — 0.085 



The division into two crystallographic groups and a remarkable 



regularity in each of these groups are obvious. 



CONCLUSION. 



1. For all temperatures the resistance change of diamagnetic 

 substances in the magnetic field can be represented by a formula of 

 the form R' jR = a — b mi c [d -\- \Sp\). 



2. The field has a directing intluence on the diamagnetic metal 

 molecules. 



3. There exists a connexion between crystal system, resistance 

 change and diamagnetic susceptibility. 



Regular 



1) M. Owen. Ann. d. Pliys. 37, p. 657, 1912. 



~) As to the place of graphite one must take into account that different kinds 

 of graphite differ greatly in properties. Further, no account is taken of the influence 

 of temperature on the order in the series. Ail series are given for room tempe- 

 rature. It seems probable that in grouping at "corresponding" temperatures and 

 "corresponding" states lead would also change its place. 



