TABLE OF CONTENTS. 
NO. PAGE 
General Results of the Makerstoun Observations — 
System of Observation in different years, 2 xi 
Magnetic Declination — 
Mean Declination and Secular Change, 4 xii 
Awnual Va/riations — 
Mean Declination, 7 xii 
Diflference of Daily Means from the Monthly Means, 11 xiv 
Diurnal Ranges, 12 xv 
Ranges of the Monthly Mean Diurnal Variation, 13 xvi 
Effect of Disturbance on the Range of the Diurnal Variation, 15 xvi 
Mean Difference of an Observation from the Monthly Mean, 16 xvii 
Number of Positive Differences, I7 xviii 
Probable EiTor of an Observation from the Monthly Mean, 20 xviii 
Monthly Variations — 
Mean Declination, 21 xix 
Diurnal Ranges, 22 xix 
Mean Difference of an Observation from the Monthly Mean, 24 xix 
Diurnal Variations — 
Method of combining Results for Different Years, 26 xx 
Results from all the Observations, for each Month, 28 xxi 
Results from all the Observations, for Groups of Months, 32 xxii 
Results from Undisturbed Days, for Groups of Months, 36 xxiii 
Effect of Disturbance on the Mean for a ^lonth and for the Year, 38 xxiv 
Effect of Disturbance on the Mean for each Hour, 39 xxiv 
Frequency of the Positive and Negative Excursions from the Hourly Mean 
Position, 40 xxv 
Sums of Disturbances from the Hourly Mean Position, 42 xxvi 
Mean Excursions of the Magnet from the Monthly Mean Position for each 
Hour, 43 xxvii 
Probable Error of an Observation from the Monthly Mean, 46 xxviii 
Variations with reference to the Moon's Hour- Angle, 47 xxix 
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