500 MAJOE-GENEEAL SAEINE ON THE EESHLTS OF HOHELT OBSEETATIONS 
Table I. 
Aggregate values of the Disturbances distributed into the different hours of their 
occurrence. 
Local 
astronomical 
hours. 
Periods ending June 30. 
Sums in the 
17 months. 
Ratios. 
Local ei-ril 
hours. 
1852-53 (8 months). 
1853-54 (9 months). 
18 
1974*4 
2937*2 
4911*6 
1*29 
6 A.M. 
19 
3046*7 
4580*2 
7626*9 
2*00 
7 A.M. 
20 
3329*8 
4752*4 
8082*2 
2*12 
8 A.M. 
21 
3564*7 
4248*9 
7813*6 
2*05 
9 A.M. 
22 
2934*4 
2921*2 
5855*6 
1*53 
10 A.M. 
23 
2105*9 
1482*8 
3588*7 
0 94 
11 A.M. 
0 
1328*4 
924*3 
2252*7 
0*59 
Nood. 
1 
1042*4 
680*3 
1722*7 
0-44 
1 P.M. 
2 
769*3 
692*7 
1462*0 
0*38 
2 P.M. 
3 
445*3 
490*0 
935*3 
0*24 
3 P.M. 
4 
643*5 
207*9 
851*4 
0*22 
4 P.M. 
5 
290*6 
562*8 
853*4 
0-22 
5 P.M. 
6 
330*2 
414*6 
744*8 
0*19 
6 P.M. 
7 
1111*8 
272*4 
1384*2 
0*36 
7 P.M. 
8 
1199*2 
760*6 
1959*8 
0*51 
8 P.M. 
9 
1740*5 
1046*9 
2787*4 
0*73 
9 P.M. 
10 
1500*3 
1755*3 
3255*6 
0-85 
1 0 P.M. 
11 
2682*4 
2898*5 
5580*9 
1*46 
11 P.M. 
12 
2537*6 
3262*1 
5799*7 
1*52 
Midnight. 
13 
2983*8 
3037*6 
6021*4 
1*58 
1 A.M. 
14 
2373*5 
2782*5 
5156*0 
1*35 
2 A.M. 
15 
1852*1 
2001*9 
3854*0 
1*00 
3 A.M. 
16 
1976*5 
2114*1 
4090*6 
1*07 
4 A.M. 
17 
2392*7 
2561*0 
4953*7 
1*29 
5 A.M. 
Total 
91544*2 
Mean 
3814*3 = 
1*00 
24 
We find in this Table, as at Toronto and elsewhere, unmistakeable evidence of the 
existence of a law regulating the occurrence of the larger disturbances according to the 
hours of solar time. From 11 a.m. to 10 p.m. inclusive, the ratios are throughout less 
than unity; from 11 p.m. to 10 a.m. inclusive, above rmity. Tliere are two epochs of 
maximum and two of minimum disturbance in the twenty-four hours: the principal 
maximum is from 7 to 9 a.m., when the proportion reaches twice the average amount ; 
the lesser maximum is from 11 p.m. to 1 a.m., when the proportion is about one and a 
half to one. The principal minimum is from 3 to 6 p.m., when the proportion is less 
than a quarter of the average ; and there is a minor minimum at 3 and 4 a.m. 
The accordance in systematic character of the variation at the different hours at Point 
Barrow with that of the corresponding variation at Toronto, may be seen by means of 
the following Table (II.), in which the ratios at Point Barrow are exliibited in compa- 
rison with those at the same hours of local time at Toronto. There is the same unmis- 
takeable evidence at both stations that the amount of disturbance at the different hours 
