ON THE FACTS AND THEORY OF EARTHQUAKE PHENOMENA. 29 
In the last memoir—that in which Perrey discusses the earthquakes of 
northern Europe and northern Asia together—he expresses with some 
caution his own belief that the preponderance of seismic phenomena in the 
winter half-year above the summer half, in the ratio above given, is worthy 
of acceptance as an empiric law for Europe at least, but doubts whether it 
may be extended to the other hemisphere. 
The geographical limits of this seismic region are somewhat arbitrary, 
reaching from the Elbe on the west to the extremity of Kamtschatka on 
the east; bounded on the north, in Europe, by the Baltic and White Seas, 
but in Asia reaching to the Arctic shores; and on the south, in Europe, by 
a great circle passing north of the Carpathian Mountains to the Euxine, the 
Caucasus and the Caspian, and thence by the Desert of Gobi to the Sea of 
Okhotsk—a vast tract, containing many important mountain-chains, though 
principally distinguished, as Perrey remarks, by its immense plains and low 
table-lands. 
The eight following tables give not only his numerical results for this 
region, but a general comparative view of the numerical results of nearly 
the whole of his memoirs, for which I have somewhat extended some of the 
tables, and changed their order slightly. 
TasLe XXI.—Earthquakes of the Northern Zone of Europe. 
Earthquakes with date of Day or Month. Season only. | 
——$— | » Pe 
a} lglelZel| ze (83 
Century Poe | Seu! 8 3 : Z 5 § S Total. 
a\|s|/4]_- 2i/8)S8)\/8\8!| se) Pe iss 
pantera, (bot |) ps] © S/S\o6|/2|/s| 28 | 28 lea 
elQ}s/e|/ a) s/ el Plals!e1s =F ae S 
Slflelalsleizlalaiolazlale ia 
WiLtoXVI., 2) 1) 1} 1) 3) 2 1] 3} 1)... I) fase : 2 8} 25 
BEVEL. ...... Amo trhealhy vid! castoscele Mile Urcky She 2|wes AE 4| 19 
POVILE. 25... 10) 7 4) 4) 4 1] 2 5) 4) 4) 3 5} (2 oa . | 54 
Nara. 25s 12) 5| 4) 5) 6 3) 2) 4) 2) 9 7 6... 5 eT 
Total ...| 27) 18} 9) 11 13 6| 5| 12} 8| 13/13, 13, 1 | 2 | 12] 163 
Winter Spring Summer | Autumn 
54 30 25 39 
Taste XXII.—Earthquakes of the Northern Zone of Asia. 
Earthquakes with date of Day or Month. With Season |, 
| only. ea 
ons 
: SiMe eter er yards. Talee 
Century. " A s 8 8 a2 Be oe Total 
Bla|<|_. .|.|3/E/S/2/8| 82) PE eS 
See reaeamiaes es | res | Er es | ou Ss 1G ce cess | ee ee 
SISISISBIiSlslsls| FRlSlo] ol ea | Ba 
SlelalajselSislalnlolazlale n 
VENT... oO .G)-2) Beek (ed) 2) 22) Ps 1 7 32 
5) a 4/6/)6/4/4/3/5/7)6)3)4)5 57 
Total ...|7 |12|8|5|5|3|6|9]}8}5}5/8| 1 7 | 89 
Winter Spring Summer. | Autumn 
27 13 23 18 
