226 ABSTRACTS OF THE MAKERSTOUN OBSERVATIONS, 1843. 
TABLE V.—Diurnal Variation of Westerly Declination deduced from the Observations at 0™ on - 
11 Term-days in 1842, and also on 11 Term-days in 1843. 
1842, | 1843. | Mean. 
Both years give nearly the same result; the observations at 10" and 11> Gott. M.T. are affected by dis- 
turbances in 1842. The mean shews :— 
The maximum of westerly declination, about 05 40™ p.m. Makerstoun mean time. 
The minimum -eer-eeeerrereceeercecserenesccrecceces [BY UOp wns Kesease aay tetas eae exer 
A secondary maximum -:::: te HU OMSK Hl fies: sesiakeinsatt suaxeatachen 
A secondary minimum: :++++++0+ssseeeeeeeeee dices 7h 10™ am, 
RANGES OF THE MonTHLY MEANS OF THE DIURNAL VARIATION. 
The ranges given in the last column of Table IV. are probably very near the truth, for though the mini- 
mum takes place after 10" Gott. M.T., the diminution after that time must be small. The range increases 
considerably from January to April, and diminishes as much from September to December, but there is little 
difference in the ranges of the six months from April to September. The range of the means for the summer 
quarter is twice as great as the range of the means for the winter quarter, the former being 10-34, and the 
latter 509. 
