the east. At the hour of the minimum of easterly disturbance, 
42. + W.A. Norton on the Variations of the Declination 
Toronto, for on this assumption the radial currents will, at 7 or 8 
a.M., lie in the meridian, and proceeding from the south, will de- 4 
flect the needle farther to the west than at any other hour, when — 
the supposed meridian of maximum excitation will deviate more or 
less from the meridian of the station. Again on the same supposi= 
tion, the meridian in bar preceding the sun some four hours, 
the currents originating on it and propagated to the zenith of the sta- 
tion will again lie in the erie of the station at about 8 pv. m., but 
they will now come from the north and deflect the needle toward 
3p.m., when the westerly disturbance is also reduced to nearly its” 
minimum of frequency and value, the points of especial excitatio 
are — Pigs of the prime. vertical, and it is only the feebler 
.» When the poit 
near the prime ‘vertical toward the" west, 2 
are in the position to have the greatest effect in a 
horizontal force. Again the dineirbaicellld a defect. p 
especially at from 10 p. m., to 4a. m., when the points 0 
frequent disturbance are near the prime vertical toward the etsll ‘ 
and wheg the current propagated from them to the zenith should 
have hetyreatst effect in weakening the force. ini- 
at the hour of the maximum disturbance in excess. The disturl 
an¢es in defect preponderate over those in excess at all hours; i 
this fact, as already intim a we have an evidence of the opera- 
the most oe and oer ook cause the disturbenae in 
defect to preponderate then, The preponderance is but slight (1% 
to 1 for the years 1841-2). 4, The westerly disturbances of deel 
nation decline in numbers and value for about 12 hours bef 
and after the maximum, with but one or two slight irregularities: 
tions. Other indications pial be panied out bas, these. wilh su 
fice for our present purpose. : 
