AND SEMI-ANNUAL SEISMIC PERIODS. 
1121 
Fig. 5. 
Period. 
Maximum. 
Amplitude. 
Annual. 
December, h 
•29 
Semi-annual. 
f April, b \ 
\ October, b j 
•11 
Annual barometric . 
November, b, or December, b 
Europe. 
20. *C. W. C. Fuchs, ‘ Statistik der Erdbeben,’ pp. 13-254 (fig. 6). 
Duration of record, 1865-1884. Number of earthquakes, 5499. 
Fig. 6. 
Period. 
Maximum. 
Amplitude. 
Annual. 
December, b 
•35 
Semi-annual. 
J April, a —April, b 
\ October, a —October, b j 
•11 
Annual barometric. . . 
November, h 
7 D 
MDCCCXCIII.—A. 
