119 
August 12. 
Two papers in each box from 12.0 to 4.0 p.m. ; but the 
air was very hazy, and there was no action on any of the 
papers. A thunderstorm occurred between 4.0. and 6.0 
p.m., and at 7.0 p.m. the papers were again examined, with 
the following results : — 
W. L. 
00 1-0 
00 2-5 
Mean = 0*0 Mean — 1*7 5 
August 13— ARNFIELD. 
Two papers in each box from 1 to 2.30 p.m.; air pretty 
clear; light breeze from W.S.W.; jet 16 feel. The spray 
box L was 9 yards from the jet. The distance on former 
occasions had varied from 7 to 17 yards according to the 
strength of the wind. 
W. L. 
1-0 (A) 3*0 (A) 
3-5 50 
The papers marked (a) had been in my pocket-book 
since the previous day, but the others were fresh from the 
ozone box. A thunderstorm occurred between 4 and 5 p.m. 
August 14. 
At 10 a.m. two papers were placed in each box; at 12 
no action had taken place on any of them, the air being 
very hazy. At 2.15 p.m. the air had become much less hazy 
and the tints were— 
W. L. 
0*0 2-0 
O'O 2-0 
The height of the jet ot water on this occasion was 21 
feet. At 2. 1 5 p.m. the readings of the dry and wet bulb 
thermometers were : — Dry, 68°-5 ; Wet, 61°.7. 
The experiments thus briefly described appear to me to 
prove that the spray from a fountain on evaporating gives 
off or produces atmospheric ozone, and in this respect is 
similar to ordinary fog or haze. 
