117 
In the first period the maximum fall occurs with south- 
west, and in the second period with south winds ; and the 
greatest differences between the two periods are with winds 
from south-east, south, south-west, and west, the differences 
with south-east and south winds being negative, and those 
with south-west and west winds positive. Comparing then 
the sums of the amounts which fell under the first two 
winds with those which fell under the last two, we have 
the following results : — 
Sum of 
S.E. & S. 
Sum of 
S.W. & W. 
Difference. 
Inches. 
Inches. 
Inches. 
1858 ... 
6-32 ... 
... 11-53 .... 
- 5-21 
1859 ... 
... 13-42 ... 
... 15-58 .... 
.. - 2-16 
1860 ... 
... 10-06 ... 
... 20-04 .... 
.. - 9-98 
1861 ... 
... 10-44 ... 
... 14-98 .... 
.. - 4-54 
1862 ... 
9-77 ... 
... 19-08 .... 
- 9-31 
1863 ... 
... 11-93 ... 
8-47 .... 
.. + 3-46 
1864 ... 
... 10-22 ... 
... 7-10 .... 
.. + 3-12 
1865 ... 
... 17-18 ... 
... 5-40 .... 
.. +11-78 
1866 ... 
.. 24-72 ... 
... 9-12 .... 
.. +15-60 
1867 ... 
... 16-14 ... 
7-98 .... 
.. + 8-L6 
1868 ... 
... 15-20 ... 
... 8-99 .... 
.. + 6-21 
It will be observed that in every year of the first period 
(1858-62) the differences were negative, while in every year 
of the second period (1863-68) they were positive; or, that 
the amounts of rainfall under south-west and west winds 
were invariably greater than those under south-east and 
south winds during the years when the number of solar 
spots was above the average, and invariably less in the 
years when the number of sun spots was below the average ; 
and further, that the greatest difference in the first series of 
years occurred in 1860, at the time of a solar spot maxi- 
mum, and that in the second series in 1866, at or very near 
the time of a solar spot minimum. 
Considering the irregular character of rainfall, both in the 
times of its occurrence and the amounts in which it falls, I 
confess I was scarcely prepared to expect that the results of 
