AND SEMI-ANNUAL SEISMIC PERIODS. 
1123 
24, D. Milne, “ Notices of Earthquake-shocks felt in Great Britain, and especially 
in Scotland,” &c. ‘Edinburgh New Phil. Journ.,’ 1841, vol. 31, pp. 95-122. 
Duration of record, 1608-1838, Number of earthquakes, 205. 
The figures for this district in Table I, differ somewhat from those given by Mr. 
Milne on p. 289 of his paper. Some of the shocks counted by him are omitted on 
account of the rules laid down in § 11, others, because they were felt in Jersey and 
Guernsey. 
Period. 
Maximum. 
Amplitude. 
Annual. 
November, h 
•49 
Semi-annual. 
f March, a 1 
t September, a J 
•16 
25. W. Roper, “ A List of the more Remarkable Earthquakes in Great Britaim 
and Ireland during the Christian Era,” 1889. (Published by T. Bell, “Observer” 
Office, Lancaster.) 
Duration of record, 1739-1888. Number of earthquakes, 297. 
This list is compiled from Perrey’s and Mallet’s catalogues and various other 
sources. Before the year 1739 the exact day of occurrence is often imperfectly given. 
Slight shocks, like those felt at Comrie, are omitted from the list, and this deprives it 
of much of its value for statistical purposes. I have excluded all earthquakes whose 
origin probably lay outside the area of Great Britain. 
Period. 
Maximum. 
Amplitude. 
Annual. 
January, b 
•29 
1 Semi-annual. 
j March, a \ 
1 September, a j 
•11 
The maximum epoch of the annual barometric period occurs in June, 6, in the north 
of Scotland ; May, 5, in the south of Scotland; and Marcli, 5, over most of England. 
France, etc, 
26. C. W. C, Fuchs, ‘ Statistik der Erdbeben,’ pp, 117-127. 
Duration of record, 1865-1884. Number of earthquakes, 193. 
The number of earthquakes is small, and, during November 26-29, 1873, there was 
a series of twenty-four shocks at Bagneres de Bigorre. On these accounts tlie lesults 
obtained are hardly satisfactory. 
7 D 2 
