87 
the law, which applies to all the months but October, the 
table showing that generally the rainfall increased with the 
amount of oscillation. Of course leaving 1863 out of the 
question would make October conform to the rule also ; but 
it is these very abnormal months which are so difficult to 
account for, and which seem to bear out Mr. Baxendell’s 
suggestion of some secondary disturbing cause operating 
during the month of October especially. (Vide Mr. Baxen- 
dell’s paper on “ Periodic Disturbances of Atmospheric 
Pressure,” Memoirs, 3rd series, vol. i. p. 263.) 
The amount of oscillation in December was 5'468 inches, 
the oscillations being thirteen in number. This is somewhat 
below the average, although the month was marked by such 
wide barometric readings as shown by the diagram. 
The following Table of Rainfall for 1865 was also com- 
municated by Mr. Vernon. 
Old Trafford, Manchester. 
Rain gauge 3 feet above the ground, and 106 feet above the sea. 
Quarterly 
Periods. 
1865. 
Fall in 
Average 
Differ- 
ences. 
No. of 
Days’ 
Rain- 
fall 
in 1865. 
Quarterly 
Periods. 
Quar- 
terly 
Periods 
for 
72 Years. 
1861. 
1865. 
Inches. 
72Years. 
1865. 
1864. 
Days. 
Days. 
Inches. 
Inches. 
Inches. 
Inches. 
Inches. 
Inches. 
C Jan. ... 
3112 
2-469 
+0643 
IS) 
38 
48 
j Feb. . 
2357 
2-379 
—0-022 
17 r 
7143 
7-722 
7-149 
(. March. 
1-674 
2-301 
—0-627 
13 ) 
C April... 
1-082 
2-025 
—0-943 
8 ) 
39 
36 
\ May... 
3-187 
2-368 
+0-819 
21 c 
5 226 
7-722 
7-279 
(.June .,. 
0957 
2-886 
—1-829 
7) 
( July . . . 
2-996 
3-561 
—0-565 
15) 
45 
36 
] Aug.... 
3-840 
3-596 
+0-244 
18 c 
7-502 
8-063 
10-357 
(. Sept . . . 
0-666 
3-200 
—2-534 
3; 
( Oct. ... 
5'005 
3-834 
+1-171 
20 4 
49 
44 
] Nov.... 
2-770 
3-464 
—0-694 
16 C 
8-518 
7-133 
10-523 
(. Dec — 
0-743 
3-225 
—2-482 
8 ) 
171 
164 
28389 
35-308 
—6-919 
153 
28-389 
30-640 
35-308 
The rainfall for 1865 has been 6919 inches below the 
average of the last seventy-two years, and 2251 inches 
