OF THE MAGNETIC DECLINATION AT POINT BAEEOW. 
501 
is regulated by a law which has reference to the hours of solar time : and there are 
similar double epochs of maxima and minima, although the order in which these occur, 
and the particular times of their occurrence, are not strictly the same ; but the differences 
in these respects will be better discussed and more clearly appreciated when we pass 
fi.*om the consideration of the occurrence of the disturbances in the aggregate to that of 
their distribution into their easterly and westerly constituents. 
Table II. 
Eatios of the aggregate Disturbances at the different hours at Toronto and at Point 
Barrow. 
Local 
astronomical 
hours. 
Ratios. 
Local civil 
hours. 
Point Barrow. 
Toronto. 
IS 
1-29 
1-05 
6 A.M. 
19 
2-00 
M7 
7 A.M. 
20 
2-12 
1-27 
8 A.M. 
21 
2-05 
Ml 
9 a.m. 
22 
1-53 
0-87 
10 A.M. 
23 
0-94 
0-66 
11 A.M. 
0 
0-59 
0-49 
Noon. 
1 
0-44 
0-30 
1 P.M. 
2 
0-38 
0-40 
2 P.M. 
3 
0*24 
0-40 
3 P.M. 
4 
0*22 
0-53 
4 P.M. 
5 
0-22 
0*56 
5 P.M. 
6 
0*19 
0-84 
6 P.M. 
7 
0-36 
0-98 
7 P.M. 
8 
0-51 
1-22 
8 P.M. 
9 
0-73 
1-82 
9 P.M. 
10 
0-85 
1-55 
10 P.M. 
11 
1-46 
1*25 
11 P.M. 
12 
1-52 
1-35 
Midnight. 
13 
1-58 
1-52 
1 A.M. 
14 
1-35 
1-21 
2 A.M. 
15 
1-00 
M3 
3 A.M. 
16 
1*07 
1-34 
4 A.M. 
17 
1*29 
1*05 
5 A.M. 
In Table III. we have the aggregate values of the disturbances at Point Barrow sepa- 
rated into their easterly and westerly constituents, with the ratios at each hour to the 
mean hourly easterly or westerly value, or to the sums of all the hours divided by 24. 
