536 
Proceedings of the Royal Society of Edinburgh. [Sess. 
Table I. — continued. 
Date. 
Hour. 
Number 
of 
Particles. 
I 
Wind 
Direction 
and Force. 
Tempera- 
ture. 
Wet Bulb 
Depression. 
Trans- 
parency 
of Air. 
27 
9.30 
70 
W. -2 
53 
0*2 
Thick. 
55 
12 
189 
55 
55 
0-2 
Air clear 
55 
1.30 
70 
55 
55 
55 
when not 
55 
3.30 
500 
W.S.W. -5 
53 
raining. 
55 
6.30 
238 
S.S.W. 1 
52*5 
03 
28 
9.45 
217 
W.N.W. 1 
55 
2-5 
Clear. 
5) 
3 
1200 
W. 1 
56 
5 
•5 
55 
6.30 
1250 
W.N.W. 1 
52-5 
5-5 
55 
29 
9.30 
217 
S. 2 
52 
0 
Raining. 
Thick. 
55 
11.30 
1250 
S.W. 2 
52 
0 
95 
55 
12.30 
1500 
W.S.W. 2 
55 
55 
55 
55 
6.30 
950 
W. 2 
50 
4 
Medium. 
55 
7.30 
950 
W. 2 
50 
4 
55 
30 
9.30 
675 
W. 3 
46 
0 
Raining. 
55 
10.30 
1250 
55 
46 
1 
Showers. 
55 
12.30 
1400 
55 
55 
55 
55 
Part II. 
(MS. received July 29, 1910. Read July 18, 1910.) 
After the observations described in the first part of this investigation were 
concluded, another series was made on the haze in the atmosphere at Falkirk. 
But before describing this part of the work we will consider some further 
observations conducted in the Highlands with the dust-counter. For this 
second series Appin was selected, because it is near Kingairloch, being 
situated on the opposite side of Loch Linnhe in an east-south-east direction, 
at a distance of 6£ miles. Appin was found to be not so suitable as 
Morar or Kingairloch for work of this kind, as there are more houses in 
the neighbourhood, and more time is taken up with going to places free 
from local pollution. 
The Appin observations were begun on the 29th June and continued to 
the 11th July. When the observations began the wind was W.S.W., but by 
the evening it veered to W.N.W., and it remained in the N.W. quadrant till 
the evening of the 7th, when it veered to a little east of north. The 
observations, accordingly, were taken in northerly winds, which were 
uniformly found to be very free from dust at Kingairloch, except on the 
days of abnormal readings when the numbers went high ; on these occasions 
