1122 
MR. C. DAVISON ON THE ANNUAL 
21. A. Pere-ey, ‘Brit. Assoc. Rep./ 1858, p. 28. 
Duration of record, 306-1843. Number of earthquakes, 1961. 
This is the table used in Dr. Knott’s Memoir on “ Earthquake Frequency,” 
referred to at the beginning of this paper. The district includes also the adjacent 
parts of Asia and Africa. 
Period. 
Maximum. 
Amplitude. 
Annual. 
December, h 
•22 
Semi-annual. 
f January, a 1 
•12 
[ July, a J 
Scandinavia and Iceland. 
22. A. Perrey, ‘Brit. Assoc. Rep.,’ 1858, p. 3. 
Duration of record, 12th to 19th centuries. Number of earthquakes, 214. 
Period. 
Maximum. 
Amplitude. 
Annual. 
December, b 
•30 
Semi-annual. 
f February, a 1 
•22 
1 August, a J 
The maximum epoch of the annual barometric period occurs in June, 6, in the 
greater part of Norway, and in March, h, in the south of Norway, and nearly all over 
Sweden. 
Great Bidtain. 
23. A. Peerey, ‘ Brit. Assoc. Rep.,’ 1858, p. 5. 
Duration of record, 11th to 19th centuries. Number of earthquakes, 217. 
The results deduced from this table are of less value than those given below, 
especially those obtained from Mr. Roper’s list. Perrey’s district is more extensive 
than the others, being the “ British Islands and Northern Isles.” 
Period. 
Maximum. 
Amplitude. 
Annual. 
Semi-annual. 
October, b 
f April, a | 
1_ October, a j 
•32 
•08 
