On Ozone. 135 



compared with Ballarat, Sandhurst, and Beechworth, in 

 1858. 



Srd. Thereactionin different seasons, and for day and night, 

 in Melbourne, with other deductions. And a table showing 

 the dates of the maximum of ozone with the state of weather 

 which accompanied it ; also, the dates of the minimum of 

 ozone with the state of weather. 



As regards the first part of the tables, namely, the rela- 

 tion of electricity to the presence or otherwise of ozone, no 

 connection can be traced with any certainty during heavy 

 rains. We certainly frequently get a maximum of ozone and 

 a minimum of negative electricity, but this is not always the 

 case. 



From the second table, it will be perceived, that Melbourne 

 has a less ozonized atmosphere than either of the three 

 inland towns. This may be due by some means to the 

 littoral position of Melbourne. 



The third part shows, as does the preceding table, that 

 most ozone is present at night at all four localities, and that 

 there is more present in autumn and winter than in spring 

 and summer. The tables of maximum and minimum clearly 

 indicate that we get most ozone in Melbourne with wind 

 from W., S.W., and S., especially with rain, and the least 

 with the wind from S.E,, E., N. The most occurs with S.W. 

 wind. 



I propose on an early occasion to supplement this paper 

 with the results of our more recent observations and experi- 

 ments, and if possible with some comparisons with the 

 sanitary condition of the neighbourhood of Melbourne. 



