97 
the average rainfall, and the number of days on which rain 
fell in each month, be compared with the general direction 
of the wind, it will be seen that the prevalence of the 
south and west winds, not only increases the amount of 
rainfall, but the number of wet days. The excess of rain- 
fall on the ground over that at 34 feet from the ground 
appears also to be affected by the wind, for the excess on 
the ground increases when south and west winds prevail 
over the north and east. The only real exceptions being in 
the difference of rainfall 34 feet from the ground in March, 
and in the number of days in J uly. I present below a table 
of comparison illustrative of these remarks. — 
1866. 
Ratio 
of 
Winds. 
Differences 
Differences of Rainfall from 
the Average of 6 Years. 
Differences 
between 
Rainfall 
3 feet 
from Ground, 
and 34 feet 
from Ground. 
from the 
Average No. 
of Days of 
Rainfall. 
In 10 inch 
Round Gauge, 
3 feet 
from Ground. 
In 5 inch 
Square Gauge, 
3 feet 
from Ground. 
N. and E. 
to 
S. and W. 
January : 
5 to 26 
+3 
+0.679 
+0-732 
— 112 
February 
10 to 18 
+6 
+0-929 
+0-886 
—•023 
March j 
15 to 16 
+4 
—0-585 
+0-655 
—•217 
April ; 
18 to 12 
—4 
—1-201 
—1-263 
—•008 
May . . 
16 to 15 
_4 
—0-612 
—0-659 
55 
June 
12 to 18 
+1 
+1-144 
+1-155 
55 
July 
I 13 to 18 
-3 
+1113 
+1-030 
55 
August 
14 to 17 
+1-018 
+0-955 
— -461 
September . . . 
8 to 22 
+2-914 
+2-885 
— -605 
October 
22 to 9 
—5 
—0-841 
—0-862 
— *271 
November ... 
9 to 21 
+5 
+2-172 
+1-999 
—•677 
December ... 
9 to 22 
+7 
+1-478 
+1-394 
—•910 
The next table shows the average daily fall in each kind 
of gauge, when the velocity of the wind has ranged between 
the number of miles indicated in the first column. — 
1 
Daily Movement of 
Wind. 
34 feet from 
the Ground. \ 
3 feet from the Ground. 
5 inch | 
Square Gauge, j 
5 inch | 
Square Gauge. 
10 inch 
Round Gauge. 
0 to 50 miles 
•054 
•050 
•053 
50 to 100 
55 
•088 
•095 
•098 
100 to 150 
55 
•098 
•107 
•110 
150 to 100 
55 
•191 
•213 
•217 
200 to 250 
55 
•233 
•250 
•251 
250 to 300 
55 
•150 
•195 
•202 
Above 300 
55 
•212 
•228 
•228 
