296 Proceedings of Royal Society of Edinburgh. [sess. 
Table IX. — Fog : Height and Changes. 
Sept. 1. — Till mid-day fog on Ben Nevis down to 2500-2900 ft. ; at Lake and on Meall- 
an’t-Suidhe from 1800 to 2800 ft.; in Glen Nevis, from 1000-2000 ft., con- 
stantly changing. All clear till 16 hrs., then fog on Ben Nevis down to 3200 
ft. at 16 h., 1700 ft. at 19 h.,3000 ft. at 21 li., and rising in Glen Nevis up to 
2250 ft. Station clear all day except at 17 h., passing clouds, bright sunshine. 
,, 2. — Till 17 h. 30 mist down to 1600-1800 ft.; occasional breaks. At 17.30 the 
wind changed from N. to W., and the mist disappeared. At 21 h. light 
fog on Meall-an’t-Suidhe between 2200-2300 ft. At 18 h. and 19 h., the 
fog coming from N.E. was blown back by W. wind. 
,, 3. — At 9 h. slight fog on Ben Nevis at 2400 ft; Station clear; at Lake from 
1700-2350 ft., then passing fog from 1900-2500 ft. ; Ben clear till 13 h., then 
fog all day down to 2400-3000 ft., clear at 21 h. ; from 18 h. fog at Lake 
1800-2350 ft. ; and at 21 h. in Glen Nevis 1900-2100 ft. Cloudy in morning, 
almost clear in evening ; occasional sunshine. 
,, 4. — At 9 h. passing fog at Lake from 1800-2000 ft. ; then to 18 h. on Ben Nevis 
down to 2600-2800 ft. ; at 21 h., station and Ben Nevis clear ; at 18 h. at 
Lake 1800-2350 ft. Cloudy all day, almost clear at 21 h. 
,, 5. — Till 14 h., passing fog from 1800-2600 ft. ; then fog on Ben Nevis down to 
2900 ft. ; from 16 h. fog on Meall-an’t-Suidhe at 2300 ft. ; and in Glen Nevis 
from 1600-2000 ft. ; none visible at 21 h. Cloudy all day, clear at night. 
,, 6. — Till 16 h. fog on Ben Nevis down to 2500-2800 ft., then all clear. Cloudy all 
day, bright intervals. 
,, 7. — Fog all day on Ben Nevis down to 2300-3500 ft.; at 9 h. on Meall-an’t-Suidhe 
2100-2300 ft. ; in Glen Nevis, 1000-1800 ft. ; at 10 h. on Meall-an’t-Suidhe, 
at 2200 ft. Cloudy all day. 
,, 8. — No fog all day except on Ben Nevis at 14 h. to 3600 ft., at 18 and 21 h. to 
3000 ft. Cloudy and hazy all day. 
,, 9. — Clear all day except on Ben Nevis at 9 h. to 3600 ft., at 18 h. to 3200 ft., at 
21 h. thunder-clouds about 2500 ft. Cloudy in morning and evening, almost 
clear at noon, hazy, squally. 
,, 10. — Till noon fog on Ben Nevis to 2900-3100 ft., then all clear. Cloudy in morn- 
ing, very clear at night. 
,, 11. — Fog on Ben Nevis all day from 2500-3100 ft. Fairly clear in morning, then 
cloudy. 
,, 12. — At 9 h. fog on Ben Nevis to 3100 ft. ; in Glen Nevis 1600-2300 ft., then clear 
all day. Clear first, then cloudy. 
,, 13. — No fog visible all day except at 10 h. on Ben Nevis to 3900 ft. Fairly clear sky 
all day ; bright sunshine. 
,, 14. — Fog on Ben Nevis all day down to 3300-3500-2800-2300 ; at 9 h. scud in Glen 
Nevis 1200-2200 ft., and at 12 h. and 14 h. passing from 1200-2200 ft. ; 
thunder at night ; cloudy all day. 
,, 15. — Fog on Ben Nevis all day down to 2900-2700 ft. ; and at 12 h. and 18 h. on 
Meall-an’t-Suidhe to 2250 ft., clear at 21 h. Cloudy all day ; fairly clear 
at 21 h. 
,, 16. — Till noon fog on Ben Nevis, 2700-3200 ft. ; 10 h. at Lake 1800-2300 ft., then 
all clear. Thunder all evening. Cloudy all day, clearing a little at 21 h. 
,, 17.— Till noon fog on Ben Nevis to 2350-3000 ft., then all clear. Sky overcast 
all day. 
,, 18. — Fog on Ben Nevis all day from 2100-2600 ft.; from 14 h. on Meall-an’t-Suidhe 
from 2100-2350 ft. ; sky overcast. 
,, 19. — Mist at times to 1800 ft.; passing at Lake, 1900-2250 ft. ; at 21 h. scud at 
2800 ft. ; cloudy, with occasional breaks. 
,, 20. — Fog on Ben Nevis up to 18 h. down to 2900-3400 ft. ; then clear; at 20 h. 
rising in valleys to 1500 ft. ; at 21 h. scud from 500-1500 ft. Cloudy first, 
then fairly clear ; gleams of sunshine. 
,, 21. — No fog all day except on Ben Nevis at 13 h. 3100 ft. ; hazy ; light cirrus in 
morning, overcast at night. 
,, 22. — Till 16 h. fog on Ben Nevis down to 1900-3100 ft. ; then clear at 21 h. to 
2600 ft. ; at 14 h. and 16 h. at Lake, 1700-2350 ft. ; in Glen Nevis up to 
1 500 ft. ; at 21 hours fog all round except at Station. Sky overcast all day. 
,, 23. — Fog on Ben Nevis all day down to 1700-3000 ft. ; at 9 h. in Glen Nevis down 
to 2000 ft. ; at 20 h. cloud caps on hills around. Overcast all day, gleams of 
sunshine ; at 10 h. mist to 1700 ft. 
