[JACKSON] MAGNETIC OBSERVATIONS IN CANADA 149 
An examination of the records obtained in earlier years shows a 
marked diminution in the easterly declination for stations in the western 
portion of the Parry Islands, which indicates a secular change from 20 
to 30 minutes. In the Lower Mackenzie Valley this secular variation 
in easterly declination amounts to about 5 minutes which diminishes 
to zero in the vicinity of the Upper Mackenzie river and Great Slave 
Lake. On the Athabaska the easterly variation appears to be on the 
increase at from 2 to 5 minutes per year. 
On the Eastern side of the Agonic line the western declination 
appears to have decreased at the rate of about 6 minutes in Barrow 
Strait and 4 minutes on the Eastern coast of Baffin Land, whilst in 
Hudson Straits at Port Burwell the decrease since 1884 has averaged 
over 20 minutes per year. 
The Inclination results show increasing values over the Parry 
Islands and Barrow Strait. At Fort Simpson on the Mackenzie the 
inclination values have been decreasing since 1844 at the rate of about 
one minute per year. At Chipewyan the decrease has been about +5 
minutes per year and at Athabaska Landing about -2 minutes per year. 
In Hudson Straits a decrease of inclination is shown at Port Bur- 
well and at Ashe Inlet of about -S minutes per year since 1884. 
Intensity observations were not made at many stations in early 
years, but total force appears to have increased somewhat over that of 
former years among the Parry Islands, and decreased in the Mackenzie 
River and Athabaska River Valleys. 
The movement of the North Magnetic Pole in a NNW direction 
seems to be clearly shown by these comparisons confirming the theory 
of Van Bemmelen!. 
Following are the tabulated results of the observations obtained 
from 1907 to 1910. 
! Terr. Mag. Vol. XII. No. 1. 
