28 
Grouped according to the seasons we have 
Winter 7 ‘02 
Spring 7 *80 
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 hemis- 
phere. 
The annual amounts derived from Mr. Abbott’s observa- 
tions are 
1858 ... 
... 7'04 
1862 ... 
... 6-96 
1859 ... 
... 6-70 
1863 ... 
... 7-77 
1860 ... 
... 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 ‘6 4, 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. 
Observations at the Melbourne Observatory. 
During the years 1858-1860, and again during 1863-5, 
ozone observations were made at the Melbourne Observa- 
tory by Mr. Robert J. Ellery, the Government Astronomer. 
Grouping the monthly means according to the seasons we 
have 
Winter 5 -25 
Spring 4T6 
Summer 3-60 
Autumn 4T4 
