502 MAJOE-GBNEEAL SABINE ON THE EESTJLTS OF HOIJELT OBSEEYATIONS 
Table III. 
Local 
astronomical 
hours. 
Disturbance-values. 
Ratios. 
Local civil hours. 
Easterly. 
Westerly. 
Easterly. 
Westerly. 
18 
3891*9 
1019*7 
1*65 
0*70 
6 A.M. 
19 
6679*5 
947*4 
2*82 
0*65 
7 A.M. j 
20 
7610*2 
472*0 
3*22 
0*33 
8 A.M. 1 
21 
6818*1 
995*5 
2*88 
0*68 
9 A.m. 1 
22 
4563-6 
1292*0 
1*93 
0*89 
10 A.M. j 
23 
2438*2 
1150*5 
1*03 
0*79 
1 1 A.M. 
0 
920*0 
1332*7 
0*40 
0*92 
Noon. i 
1 
797*9 
924*8 
0*34 
0*64 
1 P.M. j 
2 
646*9 
815*0 
0*27 
0*56 
2 P.M. 1 
3 
347*4 
587*9 
0*15 
0*40 
3 P.M. 
4 
341-4 
510*0 
0*14 
0*35 
4 P.M. 
5 
185*0 
668*4 
0*08 
0*46 
5 P.M. 
6 
207*4 
537*4 
0*09 
0*36 
6 P.M. 
7 
315*1 
1069*1 
0*13 
0*74 
7 P.M. 
8 
352*8 
1607*0 
0*15 
1*11 
8 P.M. 
9 
1128*3 
1659*1 
0*48 
1*14 
9 P.M. 
10 
1360*2 
1895*5 
0*57 
1*30 
10 P..M. 
11 
1931*2 
3649*7 
0*81 
2-52 
11 P.M. 
12 
2280*4 
3519*3 
0*96 
2*43 
Midnight. 
13 
2289*1 
3732*3 
0*96 
2*57 
1 A.M. 
14 
2540*4 
2615*6 
1*07 
1*80 
2 A.M. 
15 
2202*2 
1651*8 
0*93 
1*14 
3 A.M. 
16 
2892*3 
1198*3 
1*22 
0-82 
4 A..M. 
17 
4018-6 
935*1 
1*69 
0*64 
5 A.M. 
Total in the! 
17 months J 
56758*1 
34786*1 
Mean hourlv values / Easterly =2364*9= 1-00 
Mean hourly values... j 
On inspecting the ratios in this Table, it is obvious that the easterly and westerly 
disturbances have distinct laws in respect to the times of theii’ occuiTence. AMien 
examining the disturbances in the aggregate in Table II. (in which the easterly and 
westerly values are combined), we had occasion to observe, as one of the most notable 
features, the existence of two epochs of maximum in the twenty-foui' hours, one in the 
morning at 7, 8, and 9 a.m., and one in the evening, or more properly in the night, at 
11 P.M., midnight, and 1 a.m. ; the morning maximum being considerably the greater. 
We now perceive by means of the separation which is shown in Table III., that the 
morning maximum of the aggregate values is occasioned chiefly by the easterly distui-b- 
ances, and their evening or night maximum chiefly by the westerly disturbances. The 
easterly values have not even a secondary maximum at 11 p.M. to 1 A.M. ; nor have the 
westerly values a secondary maximum at 7, 8, and 9 a.m. Both the easterly and the 
westerly have their minimum nearly at the same hours, ^iz. from 3 to 6 p.m. ; and if allow- 
ance be made for such small irregularities as we should be prepared to expect in the results 
of a series of only a few months’ continuance, there would appear a strong probability 
that both easterly and westerly are single progressions, ha\ing their respective maxima 
