146 
the ratios in groups 1 and 2 must therefore be due, to a great 
extent, to some other cause than the influence of the wind. 
Determining for each group the mean daily rainfall, we have 
5 in. Gauge at 
1 foot elevation. 
Group. In. 
1 Mean daily Kainfall = 0-148 
2 - 0-240 
3 = 0-229 
8 in. Gauge at 
1 foot elevation. 
In. 
0-147 
0-243 
0-230 
The mean daily rainfall is therefore much less in group 1 
than in either of the other groups, thus indicating a less 
abundance of rain-forming moisture in the atmosphere, owing 
to which the rain drops in falling could not increase in size 
so rapidly as under the more favourable conditions which 
existed on the days included in groups 2 and 3. 
Separating the rainy days from those on which no rain fell, 
we have for each month the following results : — 
No. 
Total 
Mean Daily 
Movement 
Total 
Mean Daily 
’of Days 
Movement 
of Wind 
No. of 
Movement 
Movement 
of 
of the 
on Days 
Fair 
of the 
of Wind 
Rain. 
Wind. 
of 
Rain. 
Days. 
Wind. 
on Fair 
Days. 
January 
13 
3234 
249 
18 
3188 
177 
February 
12 
3583 
298 
17 
3080 
181 
March 
17 
6039 
355 
14 
2977 
213 
April 
11 
1900 
172 
19 
4027 
212 
May 
12 
2153 
179 
19 
3844 
202 
Juno 
19 
4669 
245 
11 
2130 
193 
July 
10 
2451 
245 
21 
3719 
177 
August 
16 
3153 
197 
15 
1989 
132 
September 
22 
5184 
235 
8 
1046 
131 
October 
12 
3911 
326 
19 
3645 
192 
November 
17 
4532 
266 
13 
1770 
136 
December 
14 
3224 
230 
17 
2865 
168 
175 
44033 
251-6 
191 
34280 
179-4 
From this table we see that in every month, except April 
and May, the mean daily movement of the wind was greater 
on rainy than on fair days ; and that the mean daily move- 
ment on rainy days for the entire year was 25T6 miles, and 
on days on which no rain fell only 179 - 4 miles. 
