1130 
MR. C. DAVISON ON THE ANNUAL 
(2.) Old tromometer, December, 1876-1^0vember, 1887. 38,546 observations. 
Period. 
Maximum. 
Amplitude. 
Annual. 
December, h 
•46 
Semi-annual. 
{ 
May, a I 
November, a J 
•04 
(3.) Normal tromometer, December, 1876-November, 1887. 38,546 observations. 
Period. 
Maximum. 
Amplitude. 
Annual...... 
December, b 
•49 
Semi-annual. 
f May, a 1 
1 November, a ] 
•03 
41. The results obtained above for Italy are somewhat discordant. We may 
conclude, however : (1) that the maximum of the annual seismic period occurs some 
time during the last three months of the year, and the maxima of the semi-annual 
period in April and October; the amplitudes of both periods being approximately 
equal; (2) that the maximum of the annual period in the two volcanic districts 
occurs during the summer months ; and (3) that there is a marked annual micro- 
seismic period, with its maximum occurring at the end of December, the semi-annual 
microseismic period being comparatively very slight. 
South-east of Euroj^e, dc. 
42. A. Perrey, ‘Brit. Assoc. Rep.,’ 1858, p. 18. 
Duration of record, 4th to 19th centuries. Number of earthquakes, 423. 
Perrey’s district includes the whole of the Balkan peninsula, Syria, the ..^Bgean 
Islands, and the Levant. The seismic record is admittedly incomplete. 
Period. 
Maximum. 
Amplitude. 
Anuual. 
Semi-annual. 
Irregular 
r February, a 1 
\ August, a J 
•08 
