2 
magnetism on chemical action ; the latter, with the theory of 
electro-deposition, which supposes the coating to be formed 
on the plate and not deposited , strictly speaking, thereon. 
The President exhibited a slip of paper which he had received 
from Professor Thomson. On the paper was printed by 
photography the line indicating the various changes of atmo- 
spheric electricity, which took place at the observatory of Kew 
during twelve successive hours. Much interest was excited 
by witnessing one of the first fruits of Professor Thomson’s 
beautiful instrument. The paper indicated a series of very 
rapid oscillations, about one per minute, of the intensity of 
atmospheric electrical force. 
Mr. Henry Bowman presented the following statement 
of observations on the temperature of the six summer months 
ending September 30th, 1860, taken by a self-registering 
thermometer at Victoria Park, Manchester 
Maximum. 
Minimum. 
o> 
B) 
Q 
Mean. 
Mean of 47 years. 1794 to 
1840, inclusive, (i) 
Mean ot 18C0 above that of 
game period. 
Mean of 1860 below that of 
same period. 
Number of corresponding 
m«nths in same period, 
with means as low as in 
1860. 
I860. 
April 
o 
64-4 
o 
27-7 
36-7 
4°3-6 
o 
47-1 
o 
o 
35 
6 
May 
77'2 
31-3 
45-9 
54.0 
53-2 
0-8 
29 
June 
72-4 
39-6 
32-8 
55 - 8 
00 
iO 
2-4 
10 
J uly 
78-0 
40-2 
37-8 
58-5 
• 
60-8 
• f 
2.3 
12 
August 
712 
42-0 
29-2 
560 
604 
... 
4.4 
1( 2 ) 
September 
66'2 
315 
34-7 
51-9 
56-3 
... 
4-4 
2( 3 ) 
The G months ^ 
together ... j 
78-0 
27-7 
503 
533 
56-0 
... 
2-7 
12monthsend. 4 
ing Sept. 30, > 
1860. ) 
78-0 
95 
685 
46-4 
48-8 
... 
2*4 
4(«) 
