481 
1910-11.] On some Nuclei of Cloudy Condensation. 
changed. On the shore there were now 21,000, while at the water’s edge 
there were only 154 per c.c. On walking back above high-water mark 
the numbers varied from 1700 to 10,000 per c.c. Down at the water’s 
edge the figure was 140. At 3 p.m. the readings on shore were from 
20,000 to 8000, and at the water’s edge they were now up to 427. Later, 
when the sky was cloudless, the numbers on shore varied from 10,000 to 
40,000, and at the water’s edge they had increased to 1120 per c.c. 
Here we have a repetition of the July observations ; only in this case we 
have the history of an increase in the numbers with increase in the sun- 
shine. In Table I. are given the number of particles per c.c. observed at 
water’s edge and on shore at the different hours, and the amount of cloud at 
Table I. — Dust Observations made at Appin on 8th October 1910. 
Number of Par- 
Number of Par- 
Amount 
of Cloud. 
10 = totally 
covered. 
ticles in the Air 
ticles in the Air 
Hour. 
when it left the 
after it had 
Surface of the 
Water. 
passed over 
the Foreshore. 
p.m. 
12.30 
105 
10 
2,100 
9 
... 
4,000 
460 
10 
103 
10 
420 
10 
2,240 
9 
280 
84 
10 
1.30 
70 
10 
2.10 
1,825 
21,000 
5 
154 
1,700 
10,000 
2 
140 
490 
4,200 
3 
20,000 
1 
8,000 
427 
40,000 
0 
1,12*0 
40,000 
3.45 
10,000 
0 
the time, 10 being wholly covered. At the beginning of the tests the sky 
was clouded all over, and both above high-water mark and at water’s edge 
the numbers were low, about 100 per c.c. With the coming of gleams of 
sunshine came spasmodic increases in the numbers on shore, up to as high 
VOL. xxxi 31 
