130 
LIEUT.-COLONEL SABINE ON PERIODICAL LAWS DISCOVERABLE 
Table III. 
Hours of 
Toronto time. 
Number of disturbed 
observations. 
Hours of 
Toronto time. 
Number of disturbed 
observations. 
Hours of 
Toronto time. 
Number of disturbed 
observations. 
6 A.M 
81 
2 P.M 
37 
10 P.M 
96 
7 a.m 
72 
3 P.M 
45 
11 P.M 
72 
8 A.M 
58 
4 P.M 
44 
Midnight ... 
89 
9 A.M 
10 A.M 
66 
,5 F.Af 
35 
1 A.M 
83 
71 ! 
69 
61 
6 P.M 
46 
2 A.M 
78 
1 1 A.M 
7 P.M. 
62 
3 A.M 
80 
Noon 
S P.M 
77 
101 
4 A.M 
78 
1 P.M 
55 
9 P.M 
5 A.M 
90 
It is obvious at first sight from this Table that there is a great disparity in the 
occurrence of disturbed observations during the day and during the night ; from 7 a.m. 
to 6 p.M. inclusive, the average number in each hour is 55, and from 7 p-M- to 6 a.m, 
inclusive, 82 ; but the principal contrast is between the hours of the afternoon and 
those of the night ; the average of the five hours, from 2 to 6 p.m., being only 41, or 
exactly the half of the average of the night hours, 7 p.m. to 6 a.m. But this irregularity 
of distribution in respect to hours becomes far more striking when the disturbed ob- 
servations are separated into easterly and westerly disturbances. Commencing with 
the easterly, we have the following Table : — 
Table IV. 
Hours of 
Toronto Time. 
Number of Easterly i 
disturbances. j 
Hours of 
Toronto time. 
Number of Easterly 
disturbances. 
Hours of 
Toronto time. 
Number of Easterly 
disturbances. 
6 A.M 
36 
2 P.M 
10 
: 10 P.M 
83 
7 A.M 
36 1 
3 P.M 
8 
* 11 P.M 
57 
8 A.M 
19 
4 P.M 
12 
Midnight ... 
67 
9 a.m 
23 
5 P.M 
15 
1 A.M 
54 
10 A.M 
25 i 
6 P.M 
27 
' 2 A.M 
43 
11 A.M 
30 i 
7 P.M 
45 
3 A.M 
39 
Noon 
19 1 
8 P.M 
65 
4 A.M 
35 
1 P.M 
21 
1 
9 
86 
5 A.M 
1 
43 
Here we perceive that when the easterly disturbed observations alone are consi- 
dered, the disproportion of the occurrence in the hours of the day and of the night is 
much increased, the average number in each hour, from 7 a.m. to 6 p.m. inclusive, 
being only 20'5, whilst from 7 p-m. to 6 a.m. inclusive it is 54'5. But the hours which 
are contrasted in an espeeial degree are from 2 to 6 p.m. inclusive, and from 8 p.m. to 
1 A.M. inclusive ; the average number of easterly disturbances in each of the five 
hours, from 2 to 6 p.m., being 14, and in each of the six hours, from 8 p.m. to 1 a.m., 
69: the minimum number occurring from 2 to 4 p.m. and the maximum at 8 and 
9 P.M. 
If we now turn to the westerly disturbances, as shown in the next Table, we find 
— 1st, that they have their minima at the hours when the easterly disturbances have 
their maxima; and 2nd, that they do not appear to have so marked an epoch of 
maximum occurrence as do the easterly disturbances. 
