514 MAJOR-GENEEAL SABINE ON THE DECLINATION AT POINT BAEEO^. 
The dip of the needle was observed usually twice in each week, sometimes with the 
9^-inch circle, and sometimes with the 6-inch. From October 1852 to June 1853 
inclusive, 74 observations of the dip were made, and from October 1853 to June 1854 
inclusive, 71. The abstract of the monthly results obtained by these observations is con- 
tained in the following Table. 
Table VII. 
Mean Dip of the Needle obtained in each Month. 
Months. 
Circle 
employed. 
No. of 
observa- 
tions. 
Dip. 
Months. 
Circle 
employed. 
No. of 
observa- 
tions. 
Dip. 
in. 
O / 
in. 
o / 
1852. October 
6 
6 
81 38*7 N. 
1853. October 
91 
5 
81 32-8 N. 
„ November ... 
91 
11 
81 30-0 
„ November ... 
91 
10 
81 34-5 
„ December ... 
91 
8 
81 32-8 
„ December ... 
91 
9 
81 32-3 
1853. January 
91 
9 
81 33-4 
1854. January 
6 
8 
81 31-8 
„ February 
6 
9 
81 39-9 
„ February 
6 
6 
81 36-3 
,, March 
91 
8 
81 39-0 
,, March 
6 
9 
81 38-3 
„ April 
91 
8 
81 42-4 
,, April 
91 
8 
81 34-0 
» May 
91 
9 
81 33-9 
» May 
91 
10 
81 37-8 
„ June 
6 
6 
81 34-3 
„ June 
91 
6 
81 42-4 
Mean 1852-1853 
74 
81 36*0 i 
Mean 1853-1854 
71 
81 35-6 
Of the 18 monthly determinations, 12 were observed with the 9 1 -inch circle and 6 A^ith 
the 6 -inch. The mean of the 12 with the 9^-inch is 81° 35'‘4 N., and the mean of the 
6 with the 6-inch is 81° 36'- 6 N. 
There are also Term Observations of the Declination at 5' intervals on twenty term 
days, ^. e. from November 1852 to July 1854 inclusive, omitting August 1853. These 
are reserved at Woolwich, in the hope of finding that corresponding obsen ations were 
made elsewhere. It is much to be feared that few, if any, corresponding observations 
will be found to have been made over the whole extent of the North xlmerican Con- 
tinent. 
The hourly observations at Point Barrow which have furnished the results discussed 
in this paper, are printed in the following pages. The observations recorded diuing the 
presence of aurora are distinguished by an asterisk prefixed. 
