454 
Proceedings of the Royal Society of Edinburgh. [Sess. 
ing results and conclusions, which make no pretence to be anything more 
than a mere reconnaissance in a very interesting but as yet almost wholly 
unknown region of meteorology. 
[(Added 27th June 1908.) This warning is the more necessary since 
one of the referees of this paper, a competent meteorologist, expressed con- 
siderable surprise, not to say scepticism, regarding the five cases given in 
the table on this page, in which the microbaric disturbances come from 
eastwards.] 
Specimens of the Results obtained at Loch Eabn. 
In the following tables the first column gives the day of the month on 
which the disturbance occurred ; the second, the time, reckoned from mid- 
night, when the maximum or minimum passed Ardtrostan ; the third, the 
direction from which the disturbance came ; the fourth, the velocity of 
propagation in miles per hour. 
The letter a prefixed to the date means that the phase that was timed 
was a maximum, /3 a minimum. 
Day. 
1 
Hour. 
Direction. 
y. 
Aug. 
a 18 
h. m. 
1 53 
W. 
6*7 
B 21 
12 17 
W. 19° S. 
27 
a „ 
13 53 
W. 41° S. 
47 
3 „ 
15 2 
W. 52° S. | 
19 
a 55 
18 17 
W. 26° N. i 
26 
1 « 55 
19 39 
W. 36° N. 
22 
B „ 
21 47 
W. 46° S. 
13 
“ ” 
23 44 
W. 49° S. 
36 
a 23 
14 7 
W. 62° N. 
15 
B 31 
18 36 
W. 42° S. 
41 
3 „ 
26 48 
W. 62° S. 
68 
| Sept. 
j a 1 
20 31 
W. 4° S. 
21 
| 
10 42 
E. 71° N. 
1 46 
| 
Day. 
Hour. 
Direction. 
y. 
Sept. 
a 2 
h. m. 
15 11 
E. 25° N. 
75 
1 a 55 
15 37 
E. 44° N. 
19 
3 „ 
21 18 
W. 59° S. 
21 
3 3 
14 12 
W. 25° N. 
26 
a 55 
16 8 
W. 30° S. 
48 
a 55 
26 18 
E. 55° N. 
30 
a 7 
8 28 
E. 56° N. 
19 
j a 55 
16 34 
W. 39° S. 
9 
! a 8 
3 39 
W. 15° S. 
34 
tt 55 
17 13 
W. 6 °K 
27 
B 9 
12 53 
W. 63° S. 
17 
a 55 
13 58 
W. 68 ° S. 
22 
a 13 
3 31 
W. 33° S. 
45 
3 „ 
1 
8 8 
W. 44° S. 
20 
Out of the twenty-seven cases tabulated, the disturbance came from an 
easterly direction in only five. The average direction for the disturbances 
coming from westwards is W. 19° S., and for those from eastwards E. 50° N. 
The average velocity of propagation is about 30 miles an hour. 
In average direction and velocity the minor fluctuations of the atmo- 
spheric pressure resemble cyclonic disturbances so closely that the conclusion 
is naturally suggested that they travel together; but the accuracy and 
