215 
reaching High House ; but they [meet with comparatively 
little before reaching Kendal, and yet the results are so very 
different.” Mr. Marshall’s hypothesis that ozone comes from 
the sea does not enable him to discover why there is more 
ozone at High House than at Kendal, which is several 
miles nearer the sea. During my several visits to West- 
moreland I have made ozone experiments, and have always 
obtained less ozone in the valleys and low grounds than on 
the hills and highlands. The amounts obtained have 
increased according to the height at which I have placed 
tests. All my experiments were made around Windermere. 
These facts simply show that elevated regions are more con- 
ducive to the production of ozone than low lying districts, 
however free from population or near the sea. 
Third. — Times when variable amounts of ozone are 
found. On looking carefully through my registers for the 
last five or six years, I find that, as a rule, the amounts of 
ozone increase as the height of the barometer decreases. It 
is well known that the largest amounts of ozone are detected 
when high moist winds prevail, and during magnetic and 
electric storms ; but when it is considered that winds are a 
consequence of the removal of atmospheric pressure, it may 
be expected that we shall find atmospheric conditions 
answering to the reduced amount of pressure. As the 
amount of atmospheric pressure is less on high than on low 
lands, and as more ozone is found on high than on low lands, 
so if all other conditions remain the same, it will happen 
that as the atmospheric pressure is reduced on the low lands 
a proportionate increase of amount of highland ozone will 
be found. 
Fourth. — The relation of ozone to oxygen. It is well 
known that if oxygen be eliminated from water by means 
of electric currents, ozone is found in the oxygen so elimi- 
nated. The force or activity thus given to oxygen causes it 
to manifest ozone in large quantities. Clearly then oxygen 
