98 



ME. A. E. OXLEY ON THE INFLUENCE OF MOLECULAR 



a-bromonaphthalene is also an exception. The value of BX/X is 4'5 per cent., while COTTON and 

 MouTON find that it shows a magnetic birefringence equal to that of nitrobenzene. 



It is interesting to note in passing that not only does the Kerr electric effect follow the same laws as the 

 magnetic double refraction with regard to variation of field strength and wave-length, but also that it 

 shows a rough parallelism with M for individual-substances. 





