198 MR. J. BAXENDELL ON ATMOSPHERIC OZONE. 



January 6*89 



February yoi 



March 7*01 



April 6*99 



May 680 



June 6'5o 



July 709 



August 7*52 



September 7*96 



October 7*92 



November 7"56 



December 7*19 



7-i8 



Grouped according to the seasons we have — 



Winter 7*02 



Spring 7'8o 



Summer 7*02 



Autumn 6-92 



The maximum occurs therefore in the spring, and the 

 minimum in the autumn quarter, thus agreeing very fairly 

 with the Eccles and Oxford results in the northern hemi- 

 sphere. 



The annual amounts derived from Mr. Abbott^s obser- 

 vations are — 



1858 7*04 1862 6*96 



1859 670 1863 7-77 



i860 6-85 1864 7-67 



1861 6-82 1865 8-17 



6-85 7-64 



During the first four years the frequency of solar spots 

 was above the average, and the mean amount of ozone was 

 6*85; and during the last four years sun-spot frequency 

 was below the average, and the mean amount of ozone 

 was 7*64, or 0'79 greater than in the first period, thus 

 agreeing precisely with what we have found for Oxford, 

 where the amount of ozone is least in years of greatest 

 solar- spot frequency. 



