1909 - 10 .] Halley’s Comet and the Earth’s Atmosphere. 
535 
Table I. — The Number of Dust Particles in the Air at Morar in May 1910. 
Date. 
Hour. 
Number 
of 
Particles. 
Wind 
Direction 
and Force. 
Tempera- 
ture. 
Wet-Bulb 
Depression. 
Trans- 
parency 
of Air. 
13 
12.50 
1250 
S.E. -5 
62-5 
6 
Thickish 
haze. 
55 
2.40 
1625 
65 
5 
55 
55 
6.30 
3000 
61*5 
6-8 
55 
14 
9.30 
1850 
E. -5 
59 
8-5 
55 
55 
12 
1900 
N. -5 
61 
8 
55 
55 
3.30 
1950 
62-5 
9-5 
55 
55 
6.45 
1800 
E. -5 
59*5 
8-5 
55 
15 
10 
1850 
S.E. -5 
60 
5 
55 
1 
1700 
5J 
66 
7 
55 
55 
7 
2250 
62 
6 
55 
16 
9.30 
950 
S.E. 1 
61 
6-5 
55 
2.15 
975 
55 
55 
7 
1250 
57 
5” 
55 
17 
10 
650 
57 
5 
Medium. 
55 
1 
550 
61 
6*5 
55 
8.30 
600 
51-5 
2-5 
55 
18 
9.30 
520 
55 
57-5 
5-3 
55 
55 
12 
475 
55 
60 
6-5 
55 
55 
3.15 
700 
55 
61'5 
6*5 
55 
55 
8.30 
750 
S.E. -2 
57-5 
4*5 
55 
19 
9 
1125 
S.S.E. 2 
62 
9 
Clear. 
55 
12 
1075 
S.E. 1 
66 
11 
Medium. 
55 
4.30 
825 
5 5 
66 
11 
» 
Thick. 
55 
6.30 
1100 
E.S.E. -5 
61 
8 
55 
9.15 
1450 
E. -5 
60 
7 
20 
9.15 
950 
E. 1 
66 
8 
Medium. 
55 
11 
1175 
S.E. 1 
70 
10 
55 
55 
5.15 
2750 
S.S.E. 1 
68*5 
8 
Thick. 
55 
6.45 
1275 
S.E 
55 
21 
9.30 
341 
W. *5 
54” 
2 
Thick. 
55 
3.30 
1750 
55 
63 
6 
Medium. 
55 
6 
675 
N.W. 1 
57 
4 
Clear. 
5? 
6.30 
625 
55 
55 
35 
55 
22 
10.30 
1850 
N.W. *5 
59 
5 
55 
55 
7 
1850 
N. 1 
55*5 
4*3 
55 
23 
10 
625 
N.E. 1*5 
56 
2*7 
Medium. 
55 
1 
755 
55 
58 
4 3 
55 
55 
3.30 
1750 
N.E. 2 
60 
5-5 
55 
55 
6.45 
850 
55 
56 
32 
55 
24 
9.30 
525 
E. *5 
60 
5 
55 
55 
4.30 
5500 
N.N.E. 1 
65-5 
7*5 
55 
55 
7 
2800 
N. 1 
60 
6 
55 
25 
9.15 
3900 
N.W. -5 
57-5 
37 
Very thick. 
55 
2 
2800 
W. -5 
55 
55 
2.30 
3100 
55 
55 
6.30 
3300 
N.W. -5 
58* 
5-5 
55 # 
26 
9.30 
287 
S.S.W. 1 
52-5 
•5 
Raining. 
55 
11.15 
350 
S.W. 
52 
55 
55 
1 
203 
W. 
54-5 
*5 
55 
55 
4 
257 
N.W. 1 
57 
2 
Medium. 
55 
8.30 
875 
W.N.W. 1 
» 
VOL. XXX. 
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