OF THE MAGNETIC DECLINATION AT POINT BAEEOW. 508 
the easterly about 8 a.m. and the westerly about midnight. In the easterly values in 
particular the feature of a double progression, or of two maxima or two minima in the 
twenty-four hours, is almost wholly obhterated ; whilst in the westerly, the distinctive 
character of the second maximum is softened, and the time of its occurrence removed to 
between 10 a.m. and noon. It may be remarked generally of the easterly disturbances, 
that they have in all respects their characteristic features more strongly marked than is 
the case in the westerly disturbances ; thus, 8 a.m. is distinctly the hour of the easterly 
maximum, the values at 8 a.m. exceeding considerably those at 7 or 9 a.m. ; and between 
5 and 6 p.m. is as distinctly the time of minimum, whether we regard the particular 
values at those hours, or the low values from 3 p.m. to 8 p.m., between which hours 
P.M. is intermediate. The range of the easterly variation, or the proportion which 
the values at the hours of maximum bear to those at the hours of minimum, is also much 
greater in the easterly than in the westerly disturbances, being nearly as twenty-five to 
one in the easterly, and not more than about seven to one in the westerly. In the less 
distinctly marked features of the westerly disturbances, it may be well imagined that a 
greater continuance of observation may be required to give equally assured conclusions ; 
and that the second minimum, which appears in the westerly at 8 a.m., may 'be rather 
an accidental than a persistent feature, and might disappear in a series of longer duration. 
Admitting this possibihty, the westerly variation would in such case approximate even 
more nearly than it does in Table III. to a single progression in the twenty-four hours, 
having its maximum about midnight and its minimum about 4 or 5 p.m. : and thus the 
double progression shown by the aggregate values in Table II. would be resolved, as in 
some other cases, into two single progressions (easterly and westerly), having difierent 
hours of maximum and minimum. 
The distinction which has been thus shown to exist between the phenomena of the 
easterly and westerly disturbances at Point Barrow, is a fitting preparation for the com- 
parison which the next Table presents with the analogous phenomena at Toronto. For 
reasons, which will subsequently appear, the easterly ratios at Point Barrow have been 
placed in Table IV. by the side of the westerly ratios at Toronto, and the westerly 
ratios at Point Barrow by the side of the easterly at Toronto. 
