a5 
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ON THE FACTS AND THEORY OF EARTHQUAKE PHENOMENA. 25 
TasLe XVIJ.—Earthquakes of the Antilles. 
Earthquakes with date of Day or Month. With ages se 
= only. J oie 
Century. | | .- S| |8/8| gs Bx (8 S| Total. 
ae : w/Q/]2 8 s ~ 
Kila] >i (= eal FS te ST a we jas 
0) ee) Be a a a -|e/2/8}/a/o]/e8 Ae jee 
SISSIES Sel 2/1218 /8| 24 | Ba fF 
SIPs l(aisislsiaiaiol4z are n 
ONY e) a. S03 Ay vetlareuley 
AVI. .3.5'.. aE aU ee Mpa k cl, ot 
| XVIII. 6} 7 3 4) 3) 5) 10 7 9 
i eaaaae | 9} $} 19) 12} 12] 10) 9 16) 12 
Total ...' 15) 16| 23) 17) 16| 16) 20) 28) 22 
. Winter Spring Summer | Autumn 
54 49 65 
Contrary to the result usual for Europe, the number of shocks in summer 
here seems to preponderate ; and in the critical periods we have— 
WIntersOlsticey - soos, snicteverere 5/0, «0 30 
Spring equinox ..........0..-4- 40 
Summer solstice ............ SSE Ae 
Autumnal equinox .............. 42 
or for autumn and winter together 108; spring and summer 114, —a result 
equally contrary to what has beeu found so uniformly for Europe, and to 
the prevalent belief of the inhabitants of the islands themselves, who deem 
the equinoxes the dangerous times. 
Representing by unity the mean degree of frequency, and by 12 the 
whole number of earthquakes given with date of month, we find for each 
month the following proportional number :— 
‘ey . 
B/E ON Ba 
Ge re ee ee ee 
eS(E/EISIE(S/E/S/S/2/2 
ie) <b ete ts | ee a | Onl e -|_ a 
0°81) 0°87} 1:25, 0-92 0-87) 0°87} 1:09} 1:25 Lag 1:09 0:98 0°81 
0:96 
0:98 0:89 | 1:18 
BREEOD VWs catubeeti cee syste ce Sister 
S. ” N. ee ewer e cere . eee 5 
Netheens. ZA eee ibedtes hteo 
W. ” i. Bs e@gervee of O18 OP Ce UD . ee 7} 
ONY BistesMUROMN Wiese veal ote iennc! shave sia ke 
from which, by his usual method, he deduces a mean horizontal direction— 
E. 92° 5! S. to W. 22° 5''N.; 
and it is worthy of remark, that Deville gives, as greatly disturbed in 1843, 
the zone running parallel to the great circle of W. 35° N. to E. 35° S., 
