SURVEY OE THE BRITISH ISLES FOR THE EPOCH JANUARY 1, 1891, 535 
Table XVL 
Latitude. 
Longitude. 
Declination. 
Dip. 
Horizontal force 
(metric unit). 
0 
C 
8'9 
11 
0-0017 
59 
/ 
8-5 
1-0 
0-0022 
0 
8-1 
1-0 
0-0016 
7-6 
0-8 
0-0019 
n 
8-5 
1-3 
0-0019 
57 
/ 
8-1 
11 
0-0022 
o 
7-7 
1-2 
0-0018 
7-2 
TO 
0-0019 
8-4 
1-6 
0-0021 
y 
8-1 
1-4 
0-0023 
DO 
9 
7-3 
1-3 
0-0019 
G-9 
IT 
0-0020 
10 
8T 
1-8 
0-0022 
53 
8-1 
1‘5 
0-0024 
1 E. 
6-5 
1-4 
1 
0-0019 
6-2 
IT 
0-0018 
cr 
7-0 
1-8 
0-0021 
51 
O 
7-0 
1-4 
0-0023 
2 E. 
5-9 
1-6 
0-0018 
5-8 
1-2 
0-0019 
These tables are consistent with the view that the rate of secular chano-e is 
diminishing in the case of the Declination and Dip, and increasing in the case of the 
Horizontal Force. 
We are not inclined to insist too strongly on any deductions from a comparison in 
which the value of the coefficient is based upon so short an interval as live years 
(1886-91), but, on the other hand, the secular change has never before been deter¬ 
mined from such a wealth of material as we ha/e had at our disposal, and the result, 
as far as the Declination and Dip are concerned, is in accord with the conclusion at 
which we arrived in our previous paper. 
