119 
This table shows what a similar one did last year, that 
rainy days are most numerous when the horizontal move- 
ment of the air 34 feet above the ground is about five miles 
per hour, though the heaviest falls of rain happen as the 
movement of the air increases. Last year I lound the mean 
difference of the rainfall 84 feet from the ground, and three 
feet from the ground to be - 032 inch per day. This year 
the mean difference is *043 inch. But like last year this 
difference increases as the horizontal movement of the air 
increases. 
Below I represent the rainfall during the day time of 
each month, or from 8 a.m, till 8 p.m. ; and the rainfall 
during the night of each month, or from 8 p.m. till 8 a.m. 
1868. 
Rainfall, 
from 
8a.m. to 8p.m. 
Rainfall, 
from 
8 p.m. to 8a.m. 
Difference 
between Night and 
Day Fall. 
Inches. 
Inches. 
Inches. 
January 
1-629 
1-358 
— 0271 
February 
0-659 
1-490 
+ 0-831 
March 
1-427 
2-201 
+ 0-774 
April 
0-622 
0-780 
+ 0-158 
May 
0-785 
0-134 
— 0*651 
June 
0-532 
0-093 
— 0-439 
July 
0-162 
0-236 
+ 0-074 
August 
1-773 
1-263 
— 0-510 
September 
0-540 
1-284 
-J“ 0'744 
October 
2-833 
2132 
— 0-701 
November 
1-085 
1-677 
+ 0-592 
December 
3-570 
4-243 
+ 0-673 
Sums ............ 
15-617 
16-891 
+ 1-274 
The a/bove table is the first for a whole year that I have 
had the means to prepare. No special rule appears to be 
manifest from it as to the excess of the night rainfall over 
the day fall. The greatest part of the excess, however, 
appears to fall in the colder months of the year. 
In the following table I represent the rainfall for 1868 at 
the Salford Town Hall. The gauge is a 5in. square one, 7ft. 
from the ground and 105ft. above the sea. 
