218 
January 
.. 2-74° 
July 
... 1-48' 
February 
3-40° 
August 
... l*42 c 
March 
.. 3-57° 
September . . . 
... 1-96' 
April 
.. 5-60° 
October 
... 1*48’ 
May 
2-29° 
November . . . 
... 1-00' 
June 
do 
03 
0 
December . . . 
... 2*70‘ 
But there is a still more striking relationship between the 
amounts of Solar Radiation and Ozone. In Mr. Baxendell’s 
second paper on Solar Radiation at page 104, we are pre- 
sented with the reduced annual values of Solar Radiation 
at Eccles, together with their Ratios, as follows : — 
Year. 
Reduced Values of 
Solar Radiation. 
Ratios. 
1863 ... 
9-82 
1-63 
1864 ... 
9*84 
1*51 
1865 ... 
......... 8-32 
1-57 
1866 .... 
7*06 
. 1*17 
After this is added, for comparison, the number of groups 
of solar spots observed in each year, by Schwabe, to which 
I have added a column giving the mean annual amount of 
ozone in each of these years : — 
Ratios of Solar 
Mean Annual 
Number of Groups 
Year. 
Radiation. 
Amount. 
of Solar Spots. 
1863 .. 
....... 1*63 ... 
... 1*55 .. 
.... 124 
1864 1-51 ...... M2 130 
1865 1*57 0*95 93 
1866 1-17 0*97 45 
Here it is obvious that the amounts of ozone have 
decreased each year with the amount of solar radiation, and 
pretty nearly too as the groups of solar spots have 
decreased. 
Now, if it be determined that the intensity of the solar 
radiation is coincident with the periodic activity of the 
solar photosphere — which I think Mr. Baxendell’s papers 
largely, if not conclusively, confirm — and if we find a 
