ON “ QUIET DAYS DUFJNG THE ELEVEN YEAKS 1890 TO 1900, ETC. 
345 
corrective term — (2/^ — 13) .s/24. The value assigned to s in each case was that 
given in Table III. as the inean for the 10 or 11-year period considered. The results 
under the heading “ beginning of month ” are each the arithmetic mean of two 
adjacent mid-month values; for example, the value assigned to January refers to 
January 1, and is the mean of the values for mid-December and mid-January. The 
mid-month data are the most suitable for use i:! a critical examination into the true 
nature of the phenomena; hut, assuming the existence of a true annual inequality, 
the beginning of tlie month data are probably tlie more reliaide measures of its 
anqilitude. 
In all tlie force components, unity represents ly. 
Table IV.—Annual Inequality. 
Middle of month. 
Beginning of month. 
D, 
I. 
H. 
V. 
D. 
I. 
H. 
Y 
• 
N. 
V. 
T. 
1 January . 
. +0 
08 
-6-03 
-0 
9 
0-4 
-t6-l7 
-6-16 
-0-1 
+ 0 
8 
-0-4 
4-1 
- 3-8 
February . 
. +0 
48 
-0-07 
+ 1 
9 
+ 
2-1 
+ 0-28 
-0-05 
+ 0-5 
+ 1 
6 
0-0 
+ 
0-8 
+ 1-0 
March . 
. +0 
0.3 
-4 0-.53 
-0 
1 
+ 14-4 
-f 0 • 25 
4-0-23 
+ 0-9 
+ 1 
6 
+ 0-4 
+ 
8-2 
+ 8-0 
April . . 
. -0 
31 
+ 0-18 
-0 
6 
4- 
5-7 
-0-14 
+ 0-35 
-0-3 
-0 
8 
-0-1 
+ 10-0 
+ 9-1 
May . . 
. -0 
39 
-0-15 
-b2 
7 
+ 
1-5 
-0-35 
+ 0-02 
+ 1-0 
-1 
5 
+ 1-6 
+ 
3-6 
+ 3-7 
June . 
. -0 
47 
-0-3.5 
+ 5 
2 
- 
0-3 
-0-43 
-0-25 
+ 4-0 
-1 
0 
+ 4-5 
0-6 
+ 2-1 
July . . 
. -0 
30 
-0-13 
+ 3 
8 
-f 
5-4 
-0-38 
-0-24 
+ 4-5 
-0 
6 
+ 4-9 
+ 
2-5 
+ 4-0 
1 August 
. +0 
08 
-0-19 
+ 0 
5 
- 
3-5 
-0-11 
-0-16 
+ 2-2 
+ 0 
1 
+ 2-2 
+ 
0-9 
+ 1-7 
Septemher 
. +0 
29 
-fO-20 
-4 
4 
— 
6-6 
-4 0-19 
+ 0-01 
-2-0 
+ 0 
4 
— 9 - 0 
5-1 
- 5-4 
October . 
. +0 
06 
0-00 
-4 
4 
— 
7-6 
4-0-18 
+ 0-10 
-4-4 
-0 
4 
-4-5 
_ 
7-1 
-8-3 1 
A ovein 1 )er 
. -t-0 
17 
-1-0-18 
-4 
4 
— 
2-7 
4-0-12 
+ 0-09 
- 4-4 
-0 
7 
-4-4 
5-2 
-6-5 ' 
December. 
. +0 
26 
-0-29 
+ 0 
6 
— 
7-8 
+ 0-2:^ 
-0-05 
-1-9 
+ 0 
5 
-2-1 
- 
5-2 
-5-6 j 
§ 11. If we take the beginning of tlie month data in Table IV. we have the 
following results :— 
D. 
I. 
11. 
tv. 
N. 
V. 
T. 
Range of annual inequality . 
Range + secular change 
6-71 
0-12 
6-60 
0-25 
8-9y 
0-34 
3-ly 
0-14 
9-4y 
0-28 
17-ly 
0-76 
~ 
17-4y 
1-57 
The ratio borne by the range of the annual inequality to the mean secular change 
IS certainly largest in those elements in which the uncertainties are greatest. 
In the case of D and H (or of W and N) we are dealing with elements whose 
secular change lias lieen comparatively regular, and there are other grounds for 
regarding the annual luecpialities olitained for them as the most reliable. 
Ihey show a pretty close resemblance in general character to results obtained 
VOL. ccri.— A. 2 Y 
