194 
PHYSICAL AND MATHEMATICAL SECTION. 
January 16th, 1862. 
The following returns of the rain-fall for 1861 were com- 
municated to the Section. 
Old Tr afford, Manchester. 
By G. Y. Vernon, F.R.A.S. 
Receiving surface of guage, 3 feet above tlie ground. 
1861. 
Fall of 
Rain. 
Difference 
from 
Dr. Dalton’s 
47 years’ 
Average. 
Days 
on which 
Rain fell in 
1861. 
Difference 
from 
12 years’ 
Average. 
January 
In. 
0388 
In. 
-1-869 
10 
—101 
February 
2-522 
+•079 
17 
+ 0-6 
March 
4-143 
-1-835 
25 
+11-0 
April 
2-426 
-0-312 
10 
— 3-5 
May 
0-734 
-1-712 
10 
— 31 
June 
2-412 
-0-279 
17 
+ 2-3 
July 
3-616 
-0-060 
25 
+ 8-7 
August 
2-232 
-1-231 
15 
September 
4-050 
+0-858 
19 
+ 5-8 
October 
1-230 
-2-524 
16 
— 2-3 
November 
3-878 
+0156 
20 
+ 4-4 
December 
2-066 
-1-371 
15 
— 31 
Year 
29-727 
-5-796 
199 
The rain -fall in 1861 was 6’803 inches below the fall of 
1860, the fall in that year being 36-530 inches. 
Rain fell upon 36 more days in 1860 than in 1861. 
The months in which the rain-fall was the heaviest, viz , 
March, July, September, and November, were accompanied 
by an amount of barometric oscillation above the average. 
