AND SEMI-ANNUAL SEISMIC PERIODS. 
1147 
77. G. Hogben, ihid., vol. 3, 1891, p. 44. 
Duration of record, 1848-1890. Number of earthquakes, 745. 
Counting slighter shocks, which would be reckoned together with the definition of 
tlie unit earthquake adopted in this paper, Mr. Hogben has given a table of the 
number of shocks felt in each month. The total number for the same years, obtained 
by myself, is 695. The result is to increase the amplitudes of both periods. 
Period. 
Maximum. 
Amplitude. 
Annnal. 
Semi-annTial. 
July, h 
f February, a 1 
\ August, a ] 
•14 
■23 
Chili. 
78. A. Peerey, ‘ Brit. Assoc, Pep.’, 1858, p. 27. 
Duration of record, 16th to 19th centuries. Number of earthquakes, 178. 
Peerey’s district consists of Chili and La Plata, or, in Mallet’s words, “ the 
region lying between the western slo23e of the Andes and the sea, from the 24° to the 
45° south latitude, between the Desert of Atacama on the north, and the Archipelago 
of Chonos on the south.” The number of earthquakes recorded by Peerey is small, 
considering that, as Mallet remarks, the region is one “ in which shocks of greater 
or less intensity are almost of daily occurrence.” 
Period. 
Maximum. 
Amplitude. 
Annual. 
Semi-annual. 
August, 6 
Irregular 
•14 
79. C. W. C. Fuchs, ‘ Staiistik der Erdbeben,’ pp, 322-331, 
Duration of record, 1865-1883. Number of earthquakes, 316. 
For the first seven years (1865-1871) Fuchs’ record is a full one. During the 
remainder of the time it is evidently very incomplete, there being five years (1875, 
1877, 1878, 1881, 1882), without any disturbance recorded. This deprives the list of 
much of its value for statistical purposes. 
The figures for both periods are very irregular. The maximum six-monthly mean 
(1'27) occurs at the end of August, but at the end of December it is 1*25, with much 
smaller values intervening. In like manner for the semi-annual period, the maximum 
six-half-monthly mean (I'll) occurs in the middle of April and October, but at the 
end of May and November it is ITO. 
7 G 2 
