554 COLONEL SABINE ON THE INFLUENCE OF THE MOON ON THE 
Table III. 
Lunar hours. 
October 1842 
to Sep- 
tember 1845. 
October 1845 
to Sep- 
tember 1848. 
Table I. j 
Lunar hours. 
' 
October 1842 ! 
to Sep. 1 
tember 1845. 
October 1845 
to Sep- 
tember 1848. 
Table I. 
Scale divisions. 
Scale divisions. 
Scale divisions. 
Scale divisions. 
Scale divisions. 
Scale divisions. 
0 
- 0-32 
- 0-39 
— 0-35 
12 
- 0-49 
— 0-35 
— 0-42 
1 
- 0*26 
- 0-38 
— 0-32 
13 
- 0-34 
— 0-26 
- 0-30 
2 
— 0-18 
- 0-27 
— 0-225 
14 
- 0-27 
— 0-12 
- 0-19 
3 
— 0-05 
- 0-23 
— 0-14 
15 
— 0-11 
— 0-13 
— 0-12 
4 
+ 0-15 
-f 0-14 
4 - 0-14 
16 
+ 0-07 
— 0-01 
+ 0-03 
5 
-f 0-21 
+ 0-14 
+ 0-175 
17 
+ 0-20 
+ 0-10 
+ 0-17 
6 
+ 0-20 
-f 0*13 
+ 0-17 
18 
+ 0-31 
+ 0-31 
+ 0-31 
7 
4 - 0-15 
4 - 0-08 
+ 0-11 
19 
+ 0-13 
+ 0-09 
+ 0-11 
8 
— 0-04 
4 - 0-05 
+ 0-01 
20 
+ 0-07 
+ 0-04 
+ 0-06 
9 
=- 0-10 
— 0-14 
— 0-12 
21 
- 0-17 
— 0-13 
— 0-15 
10 
— 0-34 
- 0-26 
— 0-30 
22 
— 0-31 
- 0-39 
— 0-35 
11 
- 0-47 
— 0-37 
— 0-43 
23 
- 0-39 
— 0-22 
- 0-30 
The inference from these two comparisons. Tables II. and III., appears to be 
simplyj that in consequence of the small amount of the moon s influence, which has 
to te broug'lit out from among'st many disturbing causes of much gieatei influence, 
the mean result of six years is considerably more satisfactory than the mean results 
of three years of observation, whether the latter consist of three complete years, or of 
three years composed either of thirty-six summer or of thirty-six winter months ; but 
that the variation due to the moon’s influence is distinctly cognisable in all cases. 
The results may be more irregular in the winter months, in consequence possibly of 
the greater prevalence of the other disturbing causes at that season ; and these, in a 
less complete system of observation, may in the extreme winter months, as appears to 
be the case at Prague, even wholly mask the effect of the moon’s influence. In the 
present case, if we take a mean of opposite points of the hour-circle at Toronto in the 
summer and winter half-period, we find the amount of the whole deflection, between 
O*' and 12*^ on the one hand, and 6^ and IS** on the other hand, to be 29" in the three 
years consisting of thirty-six summer months, and 24"’9 in the three years consisting 
of thirty-six winter months. If we do the same by the half- periods, each of thiee 
complete years or of eighteen summer and eighteen wintei' months, we find the whole 
deflection between 0^ and 12^ on the one hand, and 6*’ and 18’’ on the other, 28"-6 in 
the years 1842-45, and 24"-4 in the years 1845-48. The differences from the results 
of the six years combined are nearly equal in both cases. 
In order to examine whether any difference is to be traced in the lunar diurnal 
variation which it might be possible to attribute to the moon’s change of declination, 
I caused two tables to be formed, consisting respectively of the lunar diurnal varia- 
tion on the three days of highest northern, and on the three days of highest southern 
declination throughout the six years of observation ; the three days in the first 
table consisted in every case of the day when the moon was at her extreme distance 
north of the equator, and of one day before and one day after ; and in the second 
table of the day when she was at the extreme distance south of the equator, and of 
