]140 
iMR. C. DAVISON ON THE ANNUAL 
01. San Francisco .—E. S. Holden, p. 13, Table B, 
Duration of record, 1850-1886. Number of earthquakes, 254. 
1 
1 Period. 
Maximum. 
Amplitude. 
Annual. 
December, h 
i 
•41 i 
Semi-annual. 
{ April, a 1 
1 October, a J 
1 
•21 I 
Annual barometric (San Francisco) 
January, b 
1 
1 
62. San Jose and Santa Clara .—E. S. Holden, p. 15, Table C. 
Duration of record, 1850-1886. Number of earthquakes, 54. 
Professor Holden remarks that the record for these two places is very incomplete; 
he thinks that probably, if the record had been well kept, the number would have 
been as great as at San Francisco. As it is, it is too small to vield reliable results. 
Period. 
Maximum. 
Amplitude. 
Annual. 
Semi-annual. 
December, h 
{ March, a 1 
1 September, a j 
••5t5 
•33 
Mexico. 
63. C. W. C. Fuchs, ‘Statistik der Erdbeben,’ pp. 372-376. 
Duration of record, 1865-1882 Number of earthquakes, 86. 
The annual period, if one exists, is very irregular. 
Period. 
Maximum. 
Amplitude. 
Annual. 
Semi-annual. 
December, h 
j April, a 1 
\ October, a J 
•43 
■79 
The maximum of the annual barometric period occurs in January at places near 
the sea-level, and in September and October on the high ground which occupies so 
large a part of the country. 
