192 SPECIAL TYPE OF. DISTURBANCE. 



their occurrence while still incident, and thus to make physical observations likely to discriminate between 

 the different theories proposed. 



It would also be of interest to have comparative records from some Arctic station. All the sudden 

 commencements of storms which were recorded at the co-operating stations appeared of enhanced 

 magnitude at Winter Quarters. Unless we suppose them to be due to some source of disturbance 

 peculiar to the southern hemisphere which seems unlikely considering the size of the disturbances 

 experienced at Kew and Colaba as compared to those at Mauritius and Christchurch it would appear not 

 unlikely that a similar enhancement would appear at an Arctic station. If this should prove to be the 

 case it would be a most interesting fact, in view especially of the views recently advanced by VILLARD as 

 to the nature of aurora. 



