6 Alexis Perrey on Earthquakes. 
The periodicity of the phenomenon may manifest itself again 
in the renewal of the shocks. But the maxima and minima of 
the port is alone sufficient to explain this apparent anomaly. 
In these two 5-year periods, there was a series of local shocks in 
a region where earthquakes are unfrequent. 
The quinquennial period from 1810 to 1815 affords no sensible 
maxima and minima. But the facts on record are few. During 
the unhappy years of 1814, 1815, the journals took little note of 
subterranean commotions, 
* Prof. Perrey has made out, from the facts which he has collected, for the first 
f of the present century (from 1801 to 1850), that there were 5388 1 
on which earthquakes occurred ; or, counting as so many separate davs 
6th and 7th for the quadratures, 
Arranging thus the phenomena, he obtained for the 5388 days,—2761-48 at the 
syzygies and 262652 at the quadratures, leaving a difference in favor of the syzygies 
134-96 
For the 6596 days, he obtained 3434-64 at the syzygies and 3161°36 at the quadra- 
tures, leaving 273-28 in favor of the syzygies. 
Ina similar manner, for the half century preceding, or from 1751 to 1800, he ob- 
tained 1901-18 earthquake days at the syzygies, and 1753-82 at the quadratures, the 
e in favor of the syzygies being 147-36. 
ing the earthquake days during the years 1761 to 1800, which occur within 
at the apogee, leaving a difference of 604 in favor of the igee; or leaving off the 
outer two of the five days, the result was 3134 at the padincs and 278), at the 
pogee, or an excess of 35 at t rigee, 
Taking the earthquakes of o in Calabria as given for the years 1836 to 1853 
(18 years) in a Journal kept by M.S. Arcovito, he finds 437 earthquake shocks at 
the i 349 at the quadratures, or an excess of 88 at the syzygies. He 
ks wk he less 5° from ° 
