394 
Scientific Intelligence. 
Dr Boekman now tried Spirals of a large diameter. In the 
middle of a spiral 34 inches in diameter, was placed a tube of 
glass, with a steel needle, and the following were the results 
with a jar of 300 square inches. 
Repulsion North Pole. Repulsion South Pole. 
1 
O 
O 
r*H 
13°. 5 
2 
14 
16.5 
3 
14 
17 
4 
15 
18 
5 
16 
20.5 
6 
16 
19 
In these experiments, Dr Boekman found that needles of steel 
placed without the spiral , and near it , became more or less mag- 
netic , by the effect of electrical discharges ; but that they had their 
poles opposite to those placed within the spiral. 
With a spiral 84 inches in diameter, the effect on the needles 
was just perceptible. 
Another spiral between 34 and 84 inches was tried ; but its 
effect was not much greater than that produced by a spiral of 
84 inches. — See the Bibliotheque Universelle, J uin 1821, vol. xvii. 
p. 125.-133. 
METEOROLOGY. 
10. Mean Temperature at Carbeth for the Years 1817, 1818, 
1819, 1820. — The observations were made at 10 o'clock A. M. 
Lat. 55° 59' 50"; Long. 4° 21' 52" W. Height above the le- 
vel of the sea 480 feet. The thermometer was made by Crich- 
ton. 
Month. 
1817. 
1818. 
1819. 
1820. 
Mean. 
January, 
37°.4 
37°. 1 
37°.5 
30.5 
35°. 6 
February, 
39.9 
35.7 
36.9 
39.8 
38.1 
March, 
37.7 
37.7 
43 
41.8 
40 
April, 
40.1 
41.2 
45.9 
49.5 
44.2 
May, - 
44.8 
50.7 
52 
53.1 
50.1 
June, 
59.5 
59.6 
55.7 
58.2 
58 
July, 
60.2 
63 
62.6 
61.8 
61.9 
A ugust, 
56.9 
60.3 
66.5 
57.4 
60.3 
September, 
56.5 
55.3 
55.5 
55.3 
55,6 
October, 
43.5 
52 
47.4 
46.9 
47.4 
November, 
44.5 
46.4 
37.5 
42.5 
42.7 
December, 
34.6 
38.3 
32.5 
32.9 
36.2 
M CAN, 
46°.3 
48°. 1 
47°. 6 
48° 
47°. 5 
