172 
CAPTAIN YOUNGHUSBAND ON PERIODICAL LAWS 
The above table shows in a very striking manner that at St. Helena the disturb- 
ances are almost, without exception, confined to the hours of the day. At the Cape 
the hours of the day are likewise those of greatest disturbance in a very marked 
degree, as for instance, at eleven o’clock in the forenoon they are between four and 
five times as frequent, and as great in amount, as at the corresponding hour at night 
twelve hours later. Hobarton and Toronto present however very diflPerent features : 
there the hours of the night are of greatest disturbance ; but it will be seen that the 
sum of the ratios at the twelve hours of the night does not exceed the sum of the 
ratios in the twelve hours of the day in the same degree that the sum of the day ratios 
exceeds the sum of the night ratios at St. Helena and the Cape. At Hobarton the 
night ratios only slightly exceed those of the day. At Toronto the preponderance is 
greater ; but at the Cape we find the day-ratios between two and three times as 
great as those of the night, and at St. Helena about seven times as great. We 
must proceed further to gain a more perfect knowledge of the laws of the daily and 
nightly occurrences, by separating the disturbances classed according to the hours 
of their occurrence into their easterly and westerly components. 
Table VIII. 
Ratios of the Easterly and Westerly numbers and values at the several hours, to the 
mean easterly and westerly numbers and values. 
St. Helena. 
Cape of Good Hope. 
Mean time at 
the station, 
Astronomical 
Easterly. 
Westerly. 
Easterly. 
W esterly. 
reckoning. 
Numbers. 
Values. 
Numbers. 
Values. 
Numbers. 
Values. 
Numbers. 
Values. 
Day. 
18 hours 
0-08 
0-08 
0-34 
0-36 
1-10 
1-19 
0-91 1 
0-86 
19 
0-39 
0-32 
0-48 
0-43 
1-56 
1-56 
1-12 
1-10 
20 
1-08 
0-99 
0-85 
0-80 
2-29 
2-28 
1-74 ! 
1-57 
21 
1-65 
1-62 
1-52 
1-40 
2-25 
2-32 
1-84 1 
1-73 
22 
2-12 
2-22 
1-76 
1-73 [ 
2*60 
2-77 
2-00 
1-94 
23 
2-80 
2-96 
2-24 
2-24 ; 
2-56 
2-67 
1-81 
1-82 
Noon. 
3-00 
3-12 
2-47 
2-50 
2-27 
2-29 
1-76 
1-68 
1 
3*02 
3-17 
2-66 
2-73 
1-79 
1-82 
1-42 
1-29 
2 
3-06 
3-19 
2-32 
2-37 
1-54 
1-49 
1-15 
1-03 
3 
2-59 
2-61 
2-05 
2-02 
0-93 
0-89 
0-76 
0-66 
4 
2*16 
2-07 
1-61 
1-56 
0-63 
0-59 
0-86 
0-76 
5 
1-08 
0-98 
1-26 
1-18 
0-42 
0-34 
0-60 
0-58 
Sum of ratios "1 
at day-hours. J 
23-03 
23-33 
19-56 
19-32 
19-93 
20-21 
15-97 
15-02 
Night. 
6 hours 
0-41 
0-35 
0-76 
0-71 
0-42 
0-38 
0-77 
0-75 
7 
0-14 
0-12 
0-40 
0-43 
0-31 
0-24 
0-92 
0-96 
8 
0-12 
0-10 
0-47 
0-49 
0-29 
0-22 
1-01 
1-21 
9 
0-06 
0-05 
0-34 
0-41 
0-23 
0-19 
0-89 
0-97 
10 
0-04 
0-03 
0-34 
0-39 
0-23 
0-20 
0-84 
1-03 
11 
0-00 
0-00 
0-35 
0-41 
0-17 
0-16 
0-64 
0-78 
Midnight. 
0-00 
0-00 
0-39 
0-45 
0-23 
0-24 
0-61 
0-71 
13 
0-00 
0-00 
0-27 
0-28 
0-40 
0-41 
0-60 
0-60 
14 
0-02 
0-02 
0-29 
0-31 
0-44 
0-37 
0-53 
0-59 
15 
0-04 
0-04 
0-26 
0-24 
0-44 
0-40 
0-45 
0-44 
16 
0-00 
0-00 
0-27 
0-29 
0-54 
0-48 
0-49 
0-50 
17 
0-02 
0-02 
0-29 
0-31 
0-46 
0-50 
0-43 
0-42 
Sum of ratios] 
at night-hours. J 
0-85 
0-73 
4-43 
4-72 
4-16 
3-79 
8-18 
8-96 
