213 
PHYSICAL AND MATHEMATICAL SECTION. 
April 21st, 1868. 
E. W. Binney, F.R.S., F.G.S., Vice-President of the Section, 
in the Chair. 
“On Ozone and its Probable Connexion with Solar 
Radiation,” by Thomas Mackereth, F.R.A.S., F.M.S. 
Many hypotheses have been set forth respecting this 
mysterious something, ozone. My present object is to 
bring together as many known facts as I am able respecting 
it, and to draw therefrom such conclusions as I think fairly 
legitimate. The deductions that may be drawn from 
experiments made in a chemical laboratory are no doubt 
important and useful ; but if to these we can add observa- 
tions from the great laboratory of nature, we may hope to 
arrive at fuller and better information. 
First . — Where ozone cannot be found. Attempts were 
made for some time to detect it in the vicinity of the 
Manchester Royal Infirmary, but without success. Mr. 
Samuel Marshall, of Kendal, states that “ in a locality west 
of Birmingham, they have indications of the presence of 
ozone when the wind is from the west, or before it reaches 
the town ; but when the wind is in the opposite quarter, 
and passes over the town before reaching there, none is 
found.” In addition to this evidence of the absence of 
ozone in towns, I can state that, from observations I have 
made during the last six months in Salford, hardly any has 
been detected with the most sensitive tests. Hence it is 
clear that large towns either destroy ozone or prevent its 
manifestation. 
