110 
COLONEL SABINE ON PERIODICAL LAWS DISCOVERABLE 
until between 4 and 5 a.m., when the deflections at both stations again pass through 
zero to a maximum of westerly deflection at Toronto, and of easterly at Hobarton, 
which occur at the same hour, 7 a.m,, at both stations. 
The mean ratios in each of the four divisions of the twenty-four hours are as 
follows ; — 
Table VIII. 
Hours of local time. 
Aggregate values. 
Toronto. 
Easterly to Westerly. 
Hobarton. 
Westerly to Easterly. 
Day ... « 
'6 A.M. to 11 A.M. inclusive... 
0-44 
0-59 
Noon to 5 p.M. inclusive ... 
0-65 
0’6o 
Night ' 
'6 p.M. to 11 p.M. inclusive... 
3-70 
4-96 
Midnight to 5 a.m. inclusive 
1*43 
2-78 
Passing now for the moment, and in this particular case only, from ratios to ahso- 
lute values, I have placed in the following Table the arc-values of the deflections of 
the north end of the magnet at Toronto and Hobarton, at the different hours, caused 
by the disturbed observations, and taken on a daily average during the whole period 
of observation. 
Table IX. 
Hours of local 
astronomical 
time. 
Mean diurnal deflection caused 
by the disturbed observations. 
Hours of local 
astronomical 
time. 
Mean diurnal deflection caused 
by the disturbed observations. 
Toronto. 
Hobarton. 
Toronto. 
Hobarton. 
h 
/ 
0’06 East. 
h 
18 
0*24 West. 
6 
0'14 East. 
0'02 East. 
19 
0*48 West. 
0-13 East. 
7 
0'28 East. 
0' 13 West. 
20 
0-37 West. 
O' 10 East. 
8 
0'46 East. 
0'23 West. 
21 
0*33 West. 
0-1 1 East. 
9 
0"78 East. 
0'35 West. 
22 
0-21 West. 
0'09 East. 
10 
0*56 East. 
0'40 West. 
23 
0-10 West. 
0-07 East. 
11 
0'46 East. 
0'40 West. 
0 
0*13 West. 
0*04 East, 
12 
0'33 East. 
0'36 West. 
1 
0*05 W est. 
0’07 East. 
13 
0'24 East. 
0'29 West. 
2 
0-08 West. 
0*05 East. 
14 
0'14 East. 
0'24 West. 
3 
0-12 West. 
O' 10 East. 
15 
0'13 East. 
0'15 West. 
4 
0’08 West. 
0'09 East. 
16 
0'08 East. 
O'Ol West. 
5 
0‘05 West. 
O'lOEast. 
17 
0*13 West. 
0'03 East. 
The analogy of the two stations is generally so close as to give a greater import- 
ance than might otherwise be ascribed to the principal feature of difference in the 
diurnal progression, namely, that the nocturnal easterly deflection at Toronto pre- 
cedes the westerly at Hobarton throughout by about an hour ; it commences earlier, 
reaches its maximum earlier, and diminishes earlier. 
