Nature of the Effect of Sun-spot Frequency. 



311 



the only exception is Katharinenburg, where it is a maximum in 

 the Equinox. Batavia and Mauritius are exceptions as far as the 

 value of the ratio for Horizontal force is concerned. There may 

 possibly be some explanation of these three cases other than that 



Summer 



Winter 



Equinox 



Cape. 



D. 



1-14 

 1-53 

 1-42 



H. 



1-4 

 2-5 



1-4 



Hobarton. 



D. H 



•47 



•56 



•9 

 1-2 



•7 



Toronto. 



D. 



•37 



1-00 



•37 



H. 



1-2 

 1-3 



•9 



St. Helena. 



D. 



1-06 

 1-32 



•68 



H. 



1-0 



•7 





Katharinenburg. 



Pawlowsh. 



Batavia. 



Mauritius. 





D. 



H. 



D. 



H. 



D. 



H. 



D. 



H. 



Winter 



•49 

 •61 

 •68 



•83 

 1-30 

 1-15 



•52 

 1-39 



•68 



•71 



1-83 



•94 



•49 

 •62 

 •61 



•83 

 •78 

 •78 



•39 

 •68 

 •30 



•71 

 •66 



Equinox 



•60 







the maximum sun-spot influence occurs at different seasons at 

 these stations. 



In conclusion, I wish to record my thanks to Prof. Beattie for his 

 many valuable suggestions and kind encouragement while this 

 investigation was in progress. 



