12 REPORT—1858. 
And for the two months at each critical period of the year— 
Dec. and Jan., Winter Solstice........... Jo 161 
June and July, Summer GIttOe SUR SRS ee 83 
March and April, Spring Equinox......... vchies LOS 
Sept. and Oct., Autumnal ditto.............. 98 
As respects horizontal direction, the relative numbers are,— 
N. toS. siahuat ahelfecerereye eis tahs soe IoC 
IN SBS Ss es Wisc teri aver te are .- 0-43 
Poh AW ies, eteksncteleteions eistetessyovshore 1°88 
S: Bey jg NeWilseetcineae cee STrer ie 0°59 
PN ee able Serie wie ee LO? 
S.W.,, N.E. Se cmsieteus sehow he 0:96 
We ®..5) His Setaleisides sna ese (OO 
NSWe jy Sabie | Be etic -le a nae baciehen Loo 
which, by Perrey’s method of calculation, gives for the mean general hori- 
zontal direction,— 
N..71° 27' E. to S.'71° 27' W. 
To this he not only, in the case of France, confesses that he does not 
attach much weight, but also states that each century will not give the same 
mean resultant. 
The actually observed districts of shock have been mainly along the 
lines of the valleys of the Rhine and Rhone, and in an inferior degree along 
those of the Loire, Seine, Garonne, and Meuse (the Pyrenees being 
viewed as part of the Spanish region), the tendency being to a direction in 
length of the valley, others across these. When the physical and geological 
features of France and the Rhine basin are recalled, it can scarcely be 
doubted that they constitute a natural independent seismic region, with 
centres of disturbance connected probably at great depths with the extinct 
volcanic countries of central France and of the Rhine. The almost continual 
slight disturbances of St. Maurienne, lasting for more than fifteen months at 
one time, appear quite analogous to those of Comrie and East Haddam. For 
the specialities of these and other questions of the French system, however, 
the memoir itself of Perrey must be consulted. 
The basin of the Rhone has been consigned to a separate memoir. The 
precise limits assigned to the district are not stated; but we must assume 
them to extend somewhat vaguely beyond the actual catchment of the 
river, The results are given in 
Tas_e VIII.—Earthquakes of the Basin cf the Rhone. 
Earthquakes with date of Day or Month. 
a 
Oo we 
o = 
Century. Pe B x | 2 |S S| Total. 
Bg zel2lsh)e]s (ae 
Se ee ae a = = 
3 Pa ee a 2 3 a a= 2 ° © 5) taal 
SISIEIEI SSIS) P/EISI EIS 
silelalataleisa jfaslalajlyo|;alsa 
PONIES woes es APH Bas 1 2 Dt] Niel tease 2) ine uM 1 10 
DOL PAA tt ie} 1 1 3 OT vas 1 6 1 Ql 29 
XVIII 7 5 6 6 3 5 7 + 4 8 6 7 3 71 
b. D. Earns 12 | 12 8 oiled 2 2 4 6 6 8 | 14 1 81 
Total ..., 26 | 20| 16] 10/11])11] 9{ 9{|19] 15) 14) 24] 7 | 191 
Winter Spring Summer Autumn 
62 32 37 53 
