ON “QUIET” DAYS DUPJNG THE ELEVEN YEAES 1890 TO 1900, ETC. 
401 
Table XXXIV.—Variation of Horizontal Force Kange. 
(100 X mean for month -p mean of that month for 11 years.) 
1890. 
1891. 
1892. 
1893. 
1894. 
1895. 
1896. 
1897. 
1898. 
1899. 
1900. 
Absolute 
range. 
Mean 
for month. 
January . 
February . 
March. 
April. 
May. 
June. 
July. 
August. 
September .... 
October. 
November .... 
1 December .... 
Means for years . 
84 
86 
66 
83 
74 
86 
81 
81 
68 
83 
58 
106 
102 
90 
85 
80 
95 
106 
107 
115 
114 
127 
139 
124 
152 
134 
138 
104 
110 
103 
122 
130 
108 
116 
98 
126 
136 
156 
148 
142 
124 
119 
133 
123 
125 
133 
151 
162 
122 
140 
114 
127 
135 
143 
131 
119 
120 
114 
162 
140 
93 
120 
115 
142 
124 
134 
118 
109 
89 
97 
92 
148 
100 
129 
109 
95 
81 
83 
81 
99 
123 
99 
86 
61 
100 
68 
82 
98 
85 
76 
99 
74 
74 
85 
70 
86 
71 
52 
76 
74 
103 
83 
79 
88 
96 
86 
89 
38 
52 
54 
73 
82 
99 
83 
68 
87 
102 
71 
92 
58 
88 
72 
94 
73 
70 
84 
81 
75 
81 
90 
62 
52 
16- 3y 
17- 9 
27-8 
37- 5 
39-05 
39-0 
39-3 
38- 8 
35-7 
29-3 
20-9 
11-95 
80 
107 
1 
1 
120 
1.38 
131 
115 
95 
83 
78 
77 
77 
§ 43. Before passing to the immediate question of the sun-spot connection, I 
would call attention to the fact that the values assigned to the ranges in 
_ O ^ 
Tables XXXIII. and XXXIV. are without exception greater than those already 
given in Tables XI. and XIII., and that the dilferences between the two sets of 
lesults are more conspicuous in winter than in summer. This is an exceedingly good 
illustration of the principle already discussed in § 21. A range in Table XXXIII. is 
the arithmetic mean of 11 ranges, each based on a combination of only 5 days' 
results, whereas m I able XI. a l ange is based on the combination of 55 days’ results. 
The range m Table XXXIII. thus exceeds that in Table XI., the excess being most 
noticeable at those seasons ot the year when the hours of occurrence of maxima and 
minima are most variable, or when irregular disturbances are largest and most 
numerous. 
§ 44. Referring to Table I. we see that August, 1893, was the month in which 
sun-spot frequency was greatest. The largest percentage in Table XXXIII. appears 
in December, 1892, while in Table XXXIV. the largest percentage answers to 
December, 1893, and November, 1894. The 12 consecutive months for which the 
sun-spot frequency was largest extended from August, 1893, to July, 1894. The 
12 months for which the sum of the percentages is largest run from December, 1892, 
to November, 1893, in the case of D, and from January to December, 1893, in the 
case of H. Of calendar years 1893 is that having the largest mean value in all 
three tables. 
3 F 
VOL. CCII.—^A. 
