Till CONTENTS. 



NO. PAGE 



Variations of Magnetic Dip with the Moon's Declination, 126 Ix 



Remarks on the Variations of Ranges of Magnetic Dip, 127 Ix 



Diurnal Variations — 



Results from all the Observations for each Month, 128 Ixi 



Results from all the Observations, for Groups of Months, 129 Ixii 



Results from Undisturbed Observations, for Groups of Months, 130 Lxii 



Effect of Disturbance on the Hourly Means, 131 Ixiv 



Variations with reference to the Moon's Hour- Angle 132 Ixiv 



Total Magnetic Force — 



Absolute Value, 133 ixv 



Secular Change, 134 ixv 



Effect of Disturbance on the Yearly Mean Value, 135 ixv 



Annual Period, 136 Ixv 



Effect of Disturbance on the Monthly Means, 137 Isv 



Annual Variation of Ranges of Monthly Mean Diurnal Variation, 138 Ixv 



Variations with Reference to the Moon's Age,-- 139 Ixv 



Variations with reference to the Moon's Declination, 140 Lsvi 



Remark on the Variations of Ranges of Total Force, 141 ixvi 



Diurnal Variations — 



Results from all the Observations, for each Month, 142 Ixvii 



Results from all the Observations, for Groups of Months, 143 Ixvii 



Results from Undisturbed Observations, for Groups of Months, 144 Ixviii 



Effect of Disturbance on the Hourly Means, 145 ixix 



Variations with reference to the Moon's Hour-Angle, 146 Ixx 



Combined Motions of the Magnetic Needle — 



Process of Projection and General Remarks 147 Ixx 



Annual Motions, 148 Ixx 



Monthly Motions, 150 Ixxi 



Similarity of the Motions for the Positions of the Sun and Moon in De- 

 clination 151 Lxxi 



Diurnal Motions, 153 Ixxi 



Foot-note on the Determination of the Epochs of Maximum and Minimum, Ixxii 



Perimeters of the Figures of the Diurnal Motions for each Month, 156 Ixxii 



Perimeters of the Figures for Disturbed and Undisturbed Observations,--- 157 Ixxii 



Mean Angular Motions from Hour to Hour, 158 Ixxii 



Diurnal Variation of Velocity of Diurnal Motion and Relation to that of 



Disturbance, 159 Ixxiii 



Variations in the Velocity of Motion not related to Variations of Tem- 

 perature of the Air, 161 Ixxiii 



Relation of Points of Greatest and Least Velocity to the Astronomical 



Meridian, 162 Ixxiii 



