1909-10.] Halley’s Comet and the Earth’s Atmosphere. 
549 
Table VI. — Showing the Lowest and Highest Limits of Visibility observed at 
Falkirk for Winds from the Principal Directions, and at Different 
Degrees of Dryness, for June and July 1910. 
Direction 
of 
Extreme Limits of Visibility in Miles for the 
Different Wet-Bulb Depressions. 
Wind. 
2°. j 3° and 4°. 
5° and 6°. 
7° and over. 
N. 
I 
... 
30 to 150 
N.E. 
2^ to 20 
2£ to 30 
30 „ 30 
E. 
14 to li|r l4 „ 4 
2~ „ 6 
2 „ 10 
S.E. 
2 „ 16 
S. 
... 
3 4 
s.w. 
2-5 „ 25 
4 to 25 
w. 
;;; 
15 „ 150 
40 „ 125 
N.W. 
100 „ 125 
Table VII. — Showing the Mean Limit of Visibility in Miles for Winds from 
THE E.N.E. AND E. DURING THE YEARS 1891, 1896, AND JUNE AND JULY 1910. 
Year. 
Direction 
of 
Wind. 
Mean Limits of Visibility in 
Miles. 
2°. 
3° and 4°. 
5° and 6°. 
7° and over. 
1891-1896 
E.N.E. 
6 
21 
16 
19 
1910 
55 
1-5 
10 
19 
30 
1891-1896 
E. 
8 
12 
19 
19-5 
1910 
5 ? 
1-5 
2-5 
35 
6 
Note added ls£ August 
While the observations made during the last two months show an increase 
in the haze in our atmosphere, and prove that the increase was mostly found 
during anticy clonic circulation, it may be asked, Was not the air in the early 
observations more hazed in anticyclonic than in cyclonic areas ? To test 
this point, all the early observations taken in anticyclonic circulation were 
arranged in tables, in the same way as all the observations are arranged in 
Table No. III. The result is that the tables are practically alike for all 
winds at the different wet-bulb depressions. In some cases the figure is a 
little over and in others a little under ; showing that the anticyclonic air 
