AND SEMI-ANNUAL SEISMIC PERIODS. 
1141 
Central America. 
64, C. W, C. Fuchs, ‘Sfcatistik der Erdbeben,’ pp. 357-363. 
Duration of record, 1865-1884. Number of earthquakes, 190. 
Period. 
Maximum. 
Amplitude. 
Annual .... 
April, h 
■32 
Semi-annual . 
• • 
f April, a 1 
\ October, a J 
•25 
Annual bai’ometric . 
• • 
January, h —April, h 
West Indies. 
65. C. W. C. Fuchs, ‘Statistik der Erdbeben,’ pp. 364-371. 
Duration of record, 1865-1883. Number of earthquakes, 205. 
In November, 1867, a large number of earthquakes were felt at St. Thomas, more 
than four hundred between the 19th and 28th insts. Except in the few cases where 
the exact times are given, the shocks of each day are counted as a single earthquake. 
Period. 
Maximum. 
Amplitude. 
Annual. 
October, h 
■59 
Semi-annual. 
J June, h 1 
1 December, h / 
■59 
Annual barometric . 
January, h —April, h 
66. A. Perrey, ‘ Brit. Assoc. Rep.,’ 1858, pp. 24, 25. 
Duration of record, 16th to 19th centuries. Number of earthquakes, 221. 
Mallet remarks that Perrey was obliged to adopt some convention with regard 
to some of the prolonged earthquake-series. He reckoned “each month of such 
shocks as equivalent to one great earthquake.” 
Period. 
Maximum. 
Amplitude. 
i 
Annual. 
August, b 
•11 
Semi-annual. 
f March, a 1 
t September, a J 
■16 
