196 Transactions of the Boyal Society of South Africa. 
Secular Variation. 
Date. Declination. Dip. Horizontal Intensity. 
1913-49-1903-41 = 10-08 yrs. -ll'-8 +6'-7 -92y 
Tananarive. 
Date. Declination. Dip. Horizontal Intensity, 
1907 9°29'-7W. 54° 05'-7 S. -25330 T.M., vol. xvi., p. 214. 
1902 10 15-0 54 07-5 •25736T.M., vol. xii., p. 181. 
Sec2ilar Variation. 
1907-1902 = 5 yrs. -9'-l -0''4 -81y 
Van Wyk's Vlei. 
Date. Declination. Dip. Horizontal Intensity.. 
1912-93 25 37-6 59 55-6 -17584 
1904-95 26° 53'-8 W. 58° 58'-3 S. -18346 
Secular Variation. 
1912-93-1904-95 = 7-98 yrs. -9'-5 +7'-2 -95y 
Victoria Falls. (2, 3) 
Date. Declination. Dip. Horizontal Intensity.. 
1909-49 17° 12' 0 W. 51° 58'-8 S. -21673 
1904-52 17 42-3 51 31-5 -22011 
Secular Variation. 
1909-49-1904-52 = 4-97 yrs. -6'-l +5'-5 -687 
Warrenton. (2, 4) 
Date. Declination. Dip. Horizontal Intensity.. 
1911-93 23° 25'-0 W. 59° 45'-3 S. -18069 
1903-21 24 55-6 58 466 -18819 
Secular Variation. 
1911-93-1903-21 =8-72 yrs. -10'-4 +6'-8 
-86y 
