194 
‘‘On Atmospheric Ozone,” by T. Mackereth, F.R.A.S., 
F.M.S. 
At an ordinary meeting of this Society (October 20th) 
last year, I took considerable interest in a paper read by 
Mr. Baxendell, F.R.A.S., on this subject. At the conclusion 
of that paper Mr. Baxendell says that “ we ought to deter- 
mine with greater certainty and exactness than has yet 
been done the nature of the changes to which this important 
constituent of the earth’s atmosphere is subject, and of their 
relation to other atmospherical phenomena.” 
These remarks led me to an investigation of the influence 
of the movement and direction of the wind, and the amount 
of rainfall, on the development of ozone in the atmosphere. 
I have taken from my Meteorological Register the days on 
which ozone was found and on which it was not found at 
Eccles during the last two years. With each of these days 
respectively I have taken the amount of the horizontal 
movement of the air in miles, the fall of rain in inches, and 
the general direction of the wind. I have taken the last 
two years only, because my present station, which I have 
occupied a little over that time, is better adapted than my 
previous one was for the detection of ozone. In the two first 
tables given below I have reduced the elements to mean 
amounts by dividing each kind by the number of the days 
of each month, and in the third table I have given the 
means of the same elements for the two years taken together. 
