1124 
MR. C. DAVISON ON THE ANNUAL 
Period. 
]\Iaximnm. 
Amplitude. 
AnnHal. 
Semi-annual. 
December, h 
None 
•41 
27. A. Perrey, ‘Brit. Assoc. Eep./ 1858, p. 11. 
Duration of record, 5th to 19th centuries. Number of earthquakes, 656. 
Perrey’s region includes France, Belgium, and Holland, the limits of which. 
Mallet remarks, are fixed somewhat arbitrarily. 
Period. 
Maximum. 
Amplitude. 
Annual. 
January, h 
•33 
Semi-annual. 
{ January, a 1 
•10 
t July, a j 
The maximum epoch of the annual barometric period generally occurs in Novem¬ 
ber, h, in France, and in March, h, in Belgium and Holland. Over a large part of 
France, however, the six-monthly means are irregular. 
Spain and Portugal. 
28. A. Perrey, ‘ Brit. Assoc. Rep.,’ 1858, p. 8. 
Duration of record, 12th to 19th centuries. Number of earthquakes, 201. 
Period. 
Maximum. 
Amplitude. 
Annual. 
Semi-annual 
Annual barometric . 
December, b 
Probably none 
November, h 
•21 
Austria. 
29. *C. W. C. Fuchs, ‘ Statistik der Erdbeben,’ pp. 13-37. 
Duration of record, 1865-1884. Number of earthquakes, 461 (fig. 7). 
