AND SEMI-ANNUAL SEISMIC PERIODS. 
1143 
69. C. G. Knott, ‘Trans, of Seismol. Soc. of Japan,’ vol. 9, pfc. 1, 1886, Table A."”' 
Duration of record, 1873-1881. Number of earthquakes, 515. 
Period. 
Maximum. 
Amplitude. 
Annual. 
Semi-annual .... 
Irregular 
r March, a 1 
\ September, a J 
•11 
but irregular 
New Granada and Venezuela. 
70. C. W. C. Fuchs, ‘ Statistik der Erdbeben,’ pp. 347-356. 
Duration of record, 1865-1884. Number of earthquakes, 272. 
Period. 
Maximum. 
Amplitude. 
Annual. 
Semi-annual . . . . | 
February, b 
March, a —March, b 
September, a —September, b 
•64 
} - 
The maximum epoch of the annual barometric period is very variable in different 
parts of the district, occurring as early as April in some parts and as late as 
September in others. The range is, however, very small. 
Seismic Periodicity in the Southern Hemisphere. 
Southern Hemisphere. 
71. R. Mallet, ‘Brit. Assoc. Rep.,’ 1858, p. 57. (See also reference and note 
given in § 18.) 
Duration of record, 1578-1850. Number of earthquakes, 223. 
Pei’iod. 
Maximum. 
Amplitude. 
Annual. 
November, b 
•24 
Semi-annual. 
r May, a 1 
\ November, a J 
•33 
* Dr. Knott quotes from a list by Bergsma. Tbe reference he gives is ‘ Natuurkundig Tijdschrift 
voor Nederlandsch-Indie.’ I have not had an opportunity of seeing this work. 
