ON THE FACTS AND THEORY OF EARTHQUAKE PHENOMENA. | 
We proceed now to France, Belgium, and Holland, the limits of which 
Perrey fixes somewhat arbitrarily, as bounded on the south by the Medi- 
terranean and by Spain, on the west and north by the Atlantic and Northern 
Oceans, as far as the Zuyder Zee, on the east by the Rhine and Alps, but 
comprising within it Geneva, in the basin of the Rhone, and Basle, Manheim, 
Frankfort-on-the-Main, and some other cities close to the right bank and in 
the basin of the Rhine. 
Tase VII.—Earthquakes of France, Belgium, and Holland. 
Earthquakes with date of Day or Month. With date of | 
Season only. |S o 
Centur | K elelZalt@e lee 
Poel he afelg |S) 28] 28 [E=| to 
ai/silaiai. .| 3/3/1818] 8| $2) 2s ss 
SIBIEIElEIS|S/Sle18/5/8) 82 | gee" 
Slejel(ajel45 |S lapalol|ajal & a 
Bete ccvesens|) «+. cosli =06| weve] dole aed eer Cis mary | s ; 
ee ae as ey EG (a) a ae ae 1 1 
Ser vy sass %- ‘ 1 BUTE. nah ote 1 : 3 6 
‘eae Fall sell ae Siva] AWK Afreeale aoe. ses ai |i 
ITS a btaee Rat finde Kesh | oe hace fac We obeegs Nl fea) pice 
> PY) ae er ee ee sly Bhag dh 4 3 ade 1 a 
ret aco. 1 sas oasis pel ene Aa ee ce 1 2 
LACE A yf <2) Fy | gs | beg (il il he hl se 2 16 
2 31 3 a) | TS | eee) er (a! | ee ses 1 12 
>. aera Lig dna By Ug ctlt Mbeve.|caasli ds sag a 2 9 
Cee hl todbodl, Lie2h LS 1) sesfyi2l. 1} 2|1 1 1 6 21 
a ape 2 vy a Wn a | es Te ae Mel a 
2 misono 4, a) al lol, 2) O| Ai glo 3 eee 7 61 
OV Els S05 13} 15) 4) 4) 7} 3] 7 3) 8} 4) 6) 11 aod 6] 91 
XVIII. ...| 26} 20) 17) 26) 11) 18) 17} 15] 13) 18) 23) 28 1 ‘ 4 | 237 
4D. Se 27) 17) 21] 13} 13} 8} 15) 17) 15} 17) 21] 25 1 “ 1} 211 
Total. ...| 83) 64) 53) 55] 42} 36) 47] 40| 50) 48) 60] 78 9 2 | 35 | 702 
Winter Spring Summer | Autumn 
200. 133. 137. 186. 
localities eastward of San Francisco, the greatest error in time of the clocks being 3! 4”, 
and the least 0’ 22”. The time, being all reduced to that of San Francisco, gives the fol- 
lowing results :— 
Locality. Lat. Long. | Time of shock. Elapsed |) Velocity 
time. per min. 
| aU Ns Y hie om a ath. }) Se ‘* miles. 
San Francisco ...... 37 «48 192 25 )\'8 ts 30 0 00 0-0 
Sacramento ........ 88 32 121 23} 8 20 00 7 30 6-6 
BRGCKEON «hae <> alas 37 52 12] 34) 98» 23. 00 9 30 65 
TEjJON .... sss dowesp aa 00 118 46 8 45 00 32 30 6:0 
San Diego .......+..| 32 42 117 13} 8 50 00 36 30 70 
or, for the average of the five observations, 6°2 miles per minute, or 545°6 feet per second. 
The author says, this closely approximates to Prof. Bache’s results as to the rate of the 
earthquake at Limoda on 23rd December 1854 (Amer. Ass. for Advancement of Science, for 
om 7): but he appears here to confound rate of sea-waye with that of earth-wave or 
shock. 
